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Dissertations / Theses on the topic 'Demolition phase of buildings'

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Published: 10 March 2023
Last updated: 11 March 2023

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1

Huang, Haibin. "Study of reinforced concrete building demolition methods and code requirements." Morgantown, W. Va. : [West Virginia University Libraries], 2007. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5167.

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Thesis (M.S.)--West Virginia University, 2007.
Title from document title page. Document formatted into pages; contains vii, 64 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 58-59).
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2

Fletcher, Scot Lawrence. "Developing disassembly strategies for buildings to reduce the lifetime environmental impacts by applying a systems approach." Thesis, University of Sheffield, 2001. http://etheses.whiterose.ac.uk/10248/.

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The negative environmental impacts of buildings are now recognised as being of great concern. Increasingly, these concerns are being addressed in both the construction and the operational phase of a building's lifecycle. The specification of renewable or low impact materials and the criteria for designing for energy efficiency are now commonplace, but what about the final stage of a building's life-the demolition phase? The construction industry produces 24 kg of waste per person per week in the UK, and the majority of this is caused by decisions taken at the design stage. Conversely most of the current discussion in this area has been focused on dealing with the waste once it has arisen. If we are going to do more than 'end of pipe', remedial clean up of building waste we need to rethink how we design, build, use and demolish our built environment. In effect this means taking the filters out of the pipes and placing then instead in the designers heads. In addressing this situation, the aim of this thesis is to define guideline strategies that will reduce the negative environmental impacts of buildings by designing for the whole lifecycle. The research is presented in four parts. In the first part, the literature is reviewed and developed to define buildings within a cyclical systems context. This entails drawing upon relevant debates within the fields of systems thinking, architecture, bio-mimicry, industrial ecology, and industrial product design. In the second part, an investigation carried out with demolition experts is presented. In this study knowledge and opinions were sought via a number of semi-structured interviews with demolition experts. The conclusions of the case study identify strategies, which if implemented at the design stage could reduce the lifetime impacts and increase the reuse and recycling potential of buildings, their elements and material components. Following the detailed focus on end of life, the research is now expanded to consider the changes that occur throughout a building's lifetime. The aim of this is to determine where the greatest use of resources and major impacts occur throughout the building life cycle. Therefore Part III presents an investigation of the lifetime environmental impacts of office buildings. The building is fragmented into its time dependent layers (foundations, frame, claddings, services and internal fit out) and the impacts of these layers over the building lifetime are investigated. The study also examines the relative impacts of different frames and floors, which allow varying degrees of disassembly. Finally, to complete the lifecycle investigation, the embodied impacts are compared with the operational impacts over a sixty-year lifecycle. Part IV presents the conclusions of this research, based on a synthesis of the findings of the earlier chapters. Finally those areas that would benefit from further research are identified.
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3

Bothin, Ellinor. "Preservation of historically valuable buildings under the Planning and Building Law." Thesis, KTH, Fastigheter och byggande, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-147588.

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In today's society when the pressure is high on exploitation and on local governments and their decisions about resources, we must not forget our heritage. The built environment is an important part of the heritage and need to be taken care of and protected for future generations. Municipalities have the ability to work with preservation of historically valuable buildings with the help of the Planning and Building Law. By designing areas and impose restrictions on what the individual property owner may do with their building, the municipality can ensure that their ambitions of preservation are met. The purpose of this essay is to describe the methods that municipalities have available in the Planning and Building Law when it comes to the preservation of historically valuable buildings. The essay is partly based on a survey that was sent to the Swedish municipalities. The survey is primarily focused on the financial compensation a property owner may claim, if restrictions imposed on his building. An assumption that was made early in the process was that the compensation limits municipalities in planning for preservation. A previous study showed that financial compensation was not a problem in local preservation work. The conclusion I make after analyzed the answerers of the survey is that the majority of the responding municipalities, due to possible claims for financial compensation, in fact hesitant at imposing restrictions when planning for preservation of the historically valuable buildings. The survey also shows signs that building sanction fees rarely are charged for breaches.
I dagens samhälle som kantas av högt exploateringstryck och den ökade pressen på kommunerna och deras beslut om resurser, så får vi inte glömma vårt kulturarv. Den byggda miljön är en viktig del i kulturarvet och behöver tas hand om och bevaras till kommande generationer. Kommunerna har möjligheten att arbeta med bevarande av kulturhistoriskt värdefull bebyggelse med hjälp av plan- och bygglagens regler. Genom att planlägga områden och införa restriktioner för vad den enskilde fastighetsägaren får göra med sin byggnad, kan kommunen säkerställa att deras bevarandeambitioner uppfylls. Syftet med denna uppsats är att beskriva de metoder som kommunerna har att tillgå i planoch bygglagen när det kommer till bevarande av kulturhistoriskt värdefull bebyggelse. Uppsatsen bygger delvis på en enkät som har skickats ut till Sveriges kommuner. Enkäten inriktar sig främst på den ekonomiska ersättning som en fastighetsägare kan göra anspråk på, om restriktioner påförs dennes byggnad. Ett antagande som gjordes tidigt i arbetet var att ersättningen begränsar kommunerna vid planläggning för bevarande. En tidigare studie visade att den ekonomiska ersättningen inte var ett problem i kommunernas bevarandearbete. Den slutsats som jag kommer till efter en analys av svaren från enkätundersökningen är att majoriteten av de svarande kommunerna, på grund av eventuella anspråk på den ekonomiska ersättningen, i själva verket tvekar vid införande av restriktioner för bevarande av kulturhistoriskt värdefull bebyggelse. Enkätundersökningen visar även tendenser på att byggsanktionsavgifter sällan tas ut vid överträdelser.
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4

Susman, Gideon. "The application of phase change materials to cool buildings." Thesis, Brunel University, 2012. http://bura.brunel.ac.uk/handle/2438/7639.

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Five projects improve understanding of how to use PCM to reduce building cooling energy. Firstly, a post-installation energy-audit of an active cooling system with PCM tank revealed an energy cost of 10.6% of total cooling energy, as compared to an identical tankless system, because PCM under%cooling prevented heat rejection at night. Secondly, development of a new taxonomy for PCM cooling systems allowed reclassification of all systems and identified under-exploited types. Novel concept designs were generated that employ movable PCM units and insulation. Thirdly, aspects of the generated designs were tested in a passive PCM sail design, installed in an occupied office. Radiant heat transfer, external heat discharge and narrow phase transition zone all improved performance. Fourthly, passive PCM product tests were conducted in a 4.2 m3 thermal test cell in which two types of ceiling tile, with 50 and 70% microencapsulated PCM content, and paraffin/copolymer composite wallboards yielded peak temperature reductions of 3.8, 4.4 and 5.2 °C, respectively, and peak temperature reductions per unit PCM mass of 0.28, 0.34 and 0.14 °C/kg, respectively. Heat discharge of RACUS tiles was more effective due to their non-integration into the building fabric. Conclusions of preceding chapters informed the design of a new system composed of an array of finned aluminium tubes, containing paraffin (melt temperature 19.79 °C, latent heat 159.75 kJ/kg) located below the ceiling. Passive cooling and heat discharge is prioritised but a chilled water loop ensures temperature control on hotter days (water circulated at 13 °C) and heat discharge on hotter nights (water circulated at 10 °C). Test cell results showed similar passive performance to the ceiling tiles and wallboards, effective active temperature control (constant 24.6˚C air temperature) and successful passive and active heat discharge. A dynamic heat balance model with an IES% generated UK office’s annual cooling load and PCM temperature%enthalpy functions predicted annual energy savings of 34%.
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5

Villegas, Teresa, and Kimberly Wennberg. "Centrala faktorer för lyckade påbyggnationer : En kvalitativ utredning i samarbete med Fabege." Thesis, KTH, Fastigheter och byggande, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-288908.

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Byggsektorn genererar årligen stora ekologiska fotavtryck genom rivning av byggnader, då behovet av allt fler byggnader ökar i städerna, men det dessvärre råder en brist på exploaterbar mark. En alternativ lösning för att staden fortfarande ska kunna växa är att bygga på höjden och på så sätt förtäta städerna. Detta görs idag ofta genom rivning av den befintliga byggnaden för att kunna ersätta den med nybyggnation, vilket inte alls är hållbart. Det är inte rimligt att riva fullt fungerande byggnader av bra kvalité enbart för att öka mängden LOA1 och BOA2. Återanvändning är nyckeln för ett mer hållbart byggande och en alternativ lösning för att öka LOA och BOA är då att genom påbyggnation addera ytterligare våningar på redan befintliga byggnader. Syftet med denna utredning är att underlätta beslutstagandet i utredandet av det befintliga beståndet. Genom att analysera byggnaders potential för påbyggnation i tidigt skede så kan riskerna minimeras för oväntade kostnader.Vi har genom en kvalitativ utredning som främst tagits fram genom intervjuer med branschkunniga, arbetat för att identifiera mönster hos fyra redan slutförda påbyggnationer som gjorts av Fabege. Vi anser att genom att identifiera de fallgropar som kan uppkomma vid arbeten med påbyggnationer som ekonomiskt och tidsmässigt kan minimera risk och förhindra problem. Detta utförs i förhoppning att uppmuntra fler byggaktörer att påbörja fler påbyggnationer, eftersom påbyggnader i dagsläget associeras med krångel och oväntade kostnader, vilket gör att många aktörer inte vågar försöka. Denna metod som tas fram blir i form av en lathund som stegvis kan följas, där samtliga centrala faktorer vilka vi i denna utredning kallar benchmarks3 gås igenom. Varje central faktor som bedömdes som avgörande för en lyckad påbyggnad klassades i skala A, B och C för hur pass viktig den faktorn ansågs för att klara av en storskalig påbyggnad. Med storskaliga påbyggnationer menar vi främst större kontorsbyggnader där cirka 4–5 våningar är aktuellt att byggas på.För att enkelt kunna göra bedömningen så inkluderar lathunden ett polärdiagram där de olika faktorerna sammanställts. Genom ifyllning av denna, utifrån den befintliga byggnadens förutsättningar kan utredaren då få en visuell överblick över vilka faktorer som kan komma att vara hinder under byggarbetets gång.Lathunden inkluderar även en stegvis beskrivning på hur processen inleds för en påbyggnation och även fördjupningspunkter som ska ses över i tidigt skede för att minimera framtida kostnader och svårigheter.Nyckeln till en lyckad påbyggnation är goda kunskaper och grundligt förarbete. Därför tar vi fram denna lathund för att upplysa vad som är viktigt att se över i tidigt skede och lägger en god grund kunskapsmässigt och översiktmässigt. Detta för att fler byggnader ska kunna prövas som potentiella påbyggnationer.
The construction sector generates large ecological footprints annually through the demolition of buildings, as the need for more and more buildings increases in the cities, but unfortunately there is a shortage of exploitable land. An alternative solution for the city still being able to grow is to build on the height and thus densify the cities. This is often done today by demolition of the existing building in order to be able to replace it with new construction, which is not at all sustainable. It is not reasonable to demolish fully functional buildings of good quality only to increase the amount of LOA and BOA. Recycling is the key to a more sustainable construction and an alternative solution for increasing LOA and BOA is to add additional floors to already existing buildings by extension. The purpose of this investigation is to facilitate the decision making in the investigation of the existing stock. By analyzing the potential of buildings for upgrading at an early stage, the risks can be minimized for unexpected costs.Through a qualitative study, which was mainly produced through interviews with industry experts, we have worked to identify patterns of four already completed extensions made by Fabege. We believe that by identifying the pitfalls that can arise during construction with extension work can economically and temporally minimize risk and prevent problems. This is done in the hope of encouraging more companies in the field to start more constructions of this kind, as this type of building is currently associated with hassle and unexpected costs, which means that many players do not dare to try. This method that is developed will be in the form of a “reference card” that can be followed step by step, where all the key factors that we in this investigation call “benchmarks” are reviewed. Each central factor that was judged to be crucial for a successful extension was classified in scale A, B and C for how important this factor was considered to cope with a large-scale extension. By large-scale superstructures we mean mainly larger office buildings where approximately 4-5 floors are currently being built.To be able to easily make the assessment, the crib includes a polar diagram in which the various factors are compiled. By filling this in on the basis of the existing building's conditions, the investigator can then get a visual overview of what factors may be obstacles during the construction work.The guide also includes a step-by-step description of how the process begins for an extension and also in-depth points to be reviewed at an early stage to minimize future costs and difficulties.The key to a successful extension is good knowledge and thorough preparation. Therefore, we present this reference card to inform what is important to revise at an early stage and put a good foundation of knowledge and overview. This means that more buildings can be tested as potential additions.
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6

Loong, Cheuk-yui Michael, and 龍焯銳. "Impact of different construction methods for concrete buildings on waste management." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B31255942.

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7

Ozdenefe, Murat. "Phase change materials and thermal performance of buildings in Cyprus." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/phase-change-materials-and-thermal-performance-of-buildings-in-cyprus(a7b37f53-22de-47d4-ad19-2596ee75a558).html.

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This work investigates the thermal performance of buildings in Cyprus and application of a particular passive technology; Phase Change Materials (PCMs) for the ultimate aim of reducing indoor air temperatures and energy supplied for the cooling season.PCMs for passive building applications are emerging technology and have not been tested for the buildings of Cyprus neither by computer simulations nor by practical applications. In this work, particular PCM end product; wallboard, having phase change temperature of 26 oC is employed together with various construction materials and simulated for buildings of Cyprus. Description of the current state in Cyprus has been carried out in terms of low energy building studies, widely used building fabric and building statistics. There is a huge gap in Cyprus in the field of energy performance and thermal comfort of buildings, which creates big room for research. Climatic design of buildings has been abandoned resulting in poor thermal comfort and increased energy consumption. There is still no regulation in place regarding the thermal performance of buildings in North Cyprus.Recent weather data of different Cyprus locations has been investigated and compared with the simulation weather data files that are employed in this work. The author has demonstrated that Finkelstein-Schafer statistics between recent weather data of Cyprus and simulation weather data files are close enough to obtain accurate results.Dynamic thermal simulations has been carried out by using Energy Plus, which is a strong and validated thermal simulation program that can model PCMs. Simulations are done for two different building geometry; “simple building” and “typical building” by employing different construction materials. Simple building is a small size box shaped building and typical building is a real existing building and selected by investigation of the building statistics.Simulation results showed that with this particular PCM product, indoor air temperatures and cooling energies supplied to simple building is reduced up to 1.2 oC and 18.64 % when heavier construction materials are used and up to 1.6 oC and 44.12 % when lighter construction materials are used. These values for typical building are found to be 0.7 oC, 3.24 % when heavier construction materials are used and 1.2 oC, 3.64 % when lighter construction materials are used. It is also found that, if thinner walls and slabs are used in the buildings the effectiveness of the PCM lining increases in significant amount.
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8

Dyball, Dianne L. "An innovative wall-lining for buildings incorporating phase change materials." Thesis, University of Brighton, 2013. https://research.brighton.ac.uk/en/studentTheses/efdce4e8-dbb0-407b-9d57-ac45820e6743.

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The use of thermal energy storage in buildings is well understood but contemporary buildings with highly insulated, lightweight construction have low thermal inertia. This causes them to respond rapidly to external temperature changes, which results in significant internal temperature fluctuations and overheating. This research addresses this problem by developing a thermal interactive wall-lining through the inclusion of phase change materials. Phase change materials (PCMs) not only absorb sensible heat but also absorb and release latent heat during phase transition. This research set out to determine if it is possible to locate phase change materials on the surface of a room and if they can effectively improve the thermal performance of a room. Using the scientific method the suitability of different types of PCMs was investigated for inclusion within a vinyl matrix. Experiments evaluated the maximum quantity of PCM loading and thermal analysis identified the largest potential heat storage capacity for the phase change wall-lining. Following successful laboratory experiments a pilot scale prototype phase change wall-lining was manufactured and tested. The test involved an experiment comprising two thermally matched chambers to evaluate the thermal performance of the phase change wall-lining in a controlled environment. The results demonstrated the phase change wall-lining can reduce internal temperatures by more than 2°C and delay the time taken to reach extreme temperatures. The effect of different air flow rates on the ability to charge and discharge the phase change wall-lining have been evaluated to identify the required operating criteria for use in buildings. This research has developed an innovative phase change wall-lining that reduces internal peak temperatures, minimises diurnal temperature fluctuations by storing excess heat and improves the thermal comfort. The outcomes provide a greater understanding of the interaction between air and PCMs when located on the surface of a room, and indicate that such materials have the potential to improve thermal performance of new and existing buildings.
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9

Javed, Khalid. "Non linear seismic response of asymmetric buildings." Thesis, University of East London, 1999. http://roar.uel.ac.uk/1260/.

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The study presented in this thesis is an attempt towards a better understanding of the coupled lateral-torsional response of buildings subject to seismic ground motion. Some of the problems identified in the past studies are thoroughly investigated and some new areas of study are explored. Some of these problems encountered in the literature include (a) the existence of several definitions of uncoupled torsional to lateral frequency ratio (b) an arbitrary selection of structural parameters in a parametric analysis resulting in a physically inadmissible structure and (c) the effect of nonlinearity. Because of the simplified models with either eccentricity in one direction or the ground motion applied in only one direction, the effects of a bi-directional loading have not been investigated in detail. These effects may include the relative differences in the amplitude or phase components of the individual accelerograms and their orientation with respect to the building. The phase properties of accelerograms are of particular interest and these have not received much attention in the past. Using analytical methods such as Chasle's[16] and Gerschgorin's[39] theorems, the equation of motion of a bi-eccentric system is derived and all of the existing problems regarding the definition of structural parameters and their bounds are studied in depth. To facilitate nonlinear parametric study, a paraboloid non-linear elastic stiffness model is proposed. Fourier spectral methods are used to study the frequency domain characteristics of the accelerogram pair. The difference in phase and amplitude of the component frequencies in each direction are studied for their effects on the response. For phase difference, cross-correlation function is used as a comparative statistical indicator. USA earthquake records obtained from US National Geophysical Data Centre are grouped into four soil types and the analysis is performed for each group in order to explore the soil-dependency of the aforementioned effects on the response. Computer programs are written in FORTRAN for both parametric and numerical model analyses. The latter can handle any number and orientation of columns with the assumed nonlinear stiffness properties. Newmark's and Runge-Kutta methods of numerical integration with adaptive step size control have been used to calculate parametric and the hysteretic responses of the system. The response to harmonic ground acceleration is used as a preliminary investigation into the response to actual accelerogram frequency components. The study has developed relationships for different definitions of the uncoupled torsional to lateral frequency ratio. Detailed derivation of the Equation of Motion has clarified the confusion that produced different definitions in the past studies. Graphical descriptions of the admissibility bounds on system parameters are produced. The variation in the response quantities is studied for a range of amplitude and phase contents of the applied ground acceleration. The difference in phase and amplitude in x and y ground accelerations have been found to affect the response quite significantly. More generally, the relationship of these differences to the torsional mode amplification has been observed. The effects of structural frequency and eccentricity parameters are also studied. Graphs showing the relationship between, the angle of incidence of the accelerogram with respect to the principal axis of the building, and the phase difference in the accelerogram pair, have been produced. The proposed analysis involving the bi-directional ground acceleration on a bi-eccentric system is an improvement on the current methods employed in design practice. Further work is, however, required before simplified design recommendations can be made and some proposals for future research are given at the end of this thesis.
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Løtveit, Sjur Vullum. "Cost Optimality of Energy Systems in Zero Emission Buildings in Early Design Phase." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for fysikk, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-23249.

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The building sector accounts for a significant proportion of industrial countries total energy use, thus a cut in this sector has been regarded necessary to reach future climate goals. An important measure in this context is the introduction of zero emission buildings, buildings which can be defined as having a net zero annual energy demand. This master thesis is centered around finding cost optimal energy supply systems for zero emission buildings at an early stage of the building process. This thesis is closely linked to the Ådland project, currently the largest pilot project for the Research Center on Zero Emission Buildings. The testing was performed on a four floor building block located in Bergen. The ZEB-definition used was net zero primary energy consumption, where primary energy factors were used as weighting factors for the various energy carriers. Two types of primary energy factors were tested; total primary energy factors and non-renewable primary energy factors. Five different energy supply packages were investigated: Bio+PV, CHP+PV, DH+PV, HP+ST+PV and CHP+ST+PV. The base heating systems were dimensioned to cover the heating demand (space heating and domestic hot water), while PV was dimensioned so that the building reached the ZEB balance. Excess electricity was exported to the grid and sold to the local power company. The simulation tool IDA-ICE was used both for modeling the building and performing the energy simulations. The cost calculations followed the European Cost Optimal Methodology, calculating the net present value of all costs attributed to the implementation of the different packages (investments, annual costs and residual values) over a calculation period of 30 years. Both a pure financial and a macroeconomic calculation were performed for all packages. Sensitivity analyses were performed on the energy price escalation as well as investment costs.When total primary energy factors were used, the package HP+ST+PV proved to be the optimal package in all the different scenarios considered. The macroeconomic and the financial results were almost identical, mainly because of the low CO2-prices. The sensitivity analyses showed that the result is very stable with respect to uncertainties in both investment costs and future energy costs. For non-renewable primary energy factors the results showed that the package HP+ST+PV is best for both normal and high future energy price development, while the package Bio+PV was the best alternative for low energy price developments. The sensitivity analysis on investment cost showed the result for low energy price development was very sensitive for changes in investment costs, while for medium and high energy price development the result were more stable. Overall, for the energy supply packages considered and the primary energy factors used in this thesis, the conclusion is that HP+ST+PV is the cost optimal energy supply solution for the evaluated building.
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Gates, Jonathan Roger. "Solar thermal storage using phase change material for space heating in residential buildings." Thesis, University of Brighton, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.507199.

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In 2007 the domestic sector was responsible for 27% of all energy consumed by final users in the UK, yet only 1.5% of this energy was met by renewables. The utilisation of renewable energy systems such as active solar water heating with Phase Change Material (PCM) thermal storage, offers vast potential for reducing energy use and CO2 emissions in the domestic energy sector in the UK. Previous research indicated that the incorporation of PCMs in underfloor heating had the potential to make energy savings, but their use in combination with renewable energy had not been explored in the UK. Consequently this was identified as a gap in the current knowledge that the current research would fill. A shortage was also identified in real life performance data on PCM space heating system performance in the UK. The current work successfully addresses this shortfall in data and in doing so provides a significant contribution to knowledge in the area of using solar thermal storage for space heating of residential buildings. An in depth literature review was undertaken as part of the research programme, which identified the key shortcomings in existing PCM based thermal storage systems for space heating. An underfloor space heating system for residential buildings was therefore developed that addresses the weaknesses of the existing systems highlighted in the literature review. The system stores solar thermal energy during the day and then uses this to provide space heating in the evening, thus addressing the problem of matching solar availability to demand. An experimental approach was adopted for the study as numerous researchers (Kauranen et al., 1991, Hasnian, 1998, Kenisarin and Mahkamov, 2007), have demonstrated the unreliability of manufacturer's published thermophysical properties of PCM. Therefore, this research chose to adopt an experimental model approach instead of a mathematical modelling approach. A model consisting of a full size solar collector 4m2 in area and a PCM filled underfloor heating panel was constructed in the laboratory. A methodology was developed to measure the performance of the key modules which allowed the performance of the system to be evaluated. The experimental data indicated that it was possible to use a low flow rate of 2.52 litres per minute, without a detrimental effect on the performance of the PCM panel. The use of a low flow rate minimises parasitic losses and produces significant energy savings in comparison to the use of higher flow rates. The experimental results indicated that the system was able to provide adequate thermal comfort with a maximum floor heat emission of 158 W/m using a flow rate temperature of 50°C. Comparisons of the annual space heating energy of the developed integrated system versus a wet central heating system in the UK revealed a significant reduction of energy use and associated CO2 emissions by as much as 52%.
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12

Barbado, Baranda Pablo. "Cost Optimality of Energy Systems in Zero Emission Buildings in Early Design Phase." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for energi- og prosessteknikk, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-26088.

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Abstract During the uncontrolled consumption period the building sector has come to account one of the greatest proportions of greenhouse gas emissions and energy use in industrial countries. In this context, European countries have decided to address the environmental challenge by promoting the use of renewable energies and the implementation of low energy consumption requirements. For these reasons, zero emission buildings, which have a net zero annual energy demand, were regarded as a possible solution. And everything points to believe that they will continue to be crucial in a recent future. Consultants and contractors have shown the need towards a better understanding and knowledge regarding the selection of renewable energy supply solution for ZEBs. Accordingly, this Mater Thesis aims to explain how to use the new methodology for a cost-optimal selection of energy systems in early design phase analysis. It consists on a number of guidelines and Excel files that serve as templates for different calculations. The project is part of the development of a decision support method that automates the process of selecting the best system, in this particular case in office buildings. This early design phase study is not only focused on giving a cost-optimal alternative but also on performing a full analysis in terms of energy performance. It also shows the steps for both the energy systems dimension and the selection of office building parameters. A concept office building with four storeys is selected and modelled in connection with the Norwegian ZEB centre’s project report 8. Following the Norwegian NZEB definition, the simulation software IDA-ICE is used as a tool for modelling the building and simulating the energy demand. It analyses six different energy supply combinations which were selected between available renewable technologies in Norway. In comparison to the previous study applied in residential buildings, this project introduces the building’s cooling demand as a new feature of the analysis. Therefore, reversible heat pumps, free-cooling with the ground and chillers are also taken into account. Further, energy systems are economically compared by using global cost calculations, following the European Cost Optimal Methodology. Results are given in a graph where global costs and CO2 emissions produced by the energy balance of the building are shown in each axis. Finally the cost-optimal energy supply, the system with lower global costs, is selected like the most suitable option. In addition, the building energy performance is also discussed as an important parameter to be considered in the decision making process. At the end, the sensitivity analysis shows stable results with regard to changes in energy price development and PV area.
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13

Dettbarn, Dorothee. "Linking the design of facilities, recycling, and curriculum : applying a design method inspired by experiences in Latin America and South Asia to a BSU residential hall renovation." Virtual Press, 2003. http://liblink.bsu.edu/uhtbin/catkey/1266028.

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In this thesis, an environmentally sound and human scale set of design principles, which values ideas like environmental friendliness, human comfort and locality, is formulated, examined and justified. These principles are inspired by experiences in Latin America and South Asia and their universal significance is illustrated through case studies from several countries around the world.In the design project, these principles are applied in a local setting, in this case a residential hall on the Ball State University campus in Muncie, Indiana. The design embraces a ‘green’ approach to campus facility renovation as part of the holistic movement to make the campus more sustainable.The design focus will be on the reuse and revitalization of materials thrown away on campus. Projects in which economic limitations enhance this specific creativity serve as role models. Through the reuse of material, the renovation process of campus facilities can be linked to the recycling program and the curriculum of the university.
Department of Architecture
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Trinh, Hoang T. "Optimisation framework for sustainable design of concrete buildings." Thesis, Griffith University, 2021. http://hdl.handle.net/10072/409575.

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The building industry is identified as the largest single contributor to climate change, due to extensive consumption of natural resources and the discharge of high volumes of carbon emissions. It is consequently imperative for the whole sector to work towards sustainable design and construction. Although structural engineers have the greatest potential to enhance buildings’ sustainability by means of structural optimisation and/or material efficiency, they often play a restricted role in the sustainable design of a project. While many studies separately investigate the eco-friendly potentials of horizontal frames and vertical systems, most of them have not thoroughly considered all major components together for the whole structure, making it challenging for structural designers to incorporate and apply their findings into design projects. In addition, many design factors that are decided in early design stages have tremendous impacts on a building’s life cycle carbon footprint. Therefore, a comprehensive op imisation methodology that allows for a thorough environmental impact assessment and a quick investigation of the design solutions space is extremely essential. To facilitate sustainable designs of buildings in conceptual and preliminary designs, this research attempts to develop an innovative optimisation framework, combining an advanced deterministic optimisation algorithm and a data-driven surrogate model. Overall, the framework is comprised of two main phases: the design optimisation phase and the surrogate Artificial Neural Networks (ANN) modelling phase. In the design optimisation phase, the carbon-minimised design problems are formulated in accordance with relevant Australian design standards and solved with deterministic Branch-and-Reduce algorithm. Three types of concrete buildings are investigated, namely flat plate, flat slab with drop panels, and beam-slab systems. To verify the effectiveness and reliability of the formulated problems and adopted algorithm, sample building problems are solved and compared with their conventionally designed counterparts. Accordingly, the optimised buildings have shown to be environmentally superior to the conventional designs, with a reduction in EC of 0.8-22.6%, 1.1-32.3%, and 1.8-26.6%, respectively for flat plate, flat slab, and beam-slab buildings. Regardless of the type of buildings, most of the optimised designs were solved within two days, demonstrating significant time efficiency. In the surrogate ANN modelling phase, hundreds of building optimisation problems with different structural heights, spans, and column grids are randomly generated and solved for minimum CO2 emissions. These numerical applications are subsequently used to develop ANNs for the predictions of optimal design solutions. The input variables are the basic information of a building, including the building height, numbers of spans, column spacings, and concrete strengths for slabs and columns. The outputs are the essential design solutions, namely the slab thickness, drop panel depth, beam dimensions, column size, amounts of reinforcement for slabs, beams and columns, and the resultant carbon footprint. Thousands of ANNs with different hyperparameters and configurations are investigated to determine the best performing models. The networks are evaluated based on three statistical metrics: the Root Mean Squared Error (RMSE), Mean Absolute Percentage Error (MAPE), and adjusted Coefficient of Determination (𝑅̅2). Compared to statistical multiple linear regression models, ANNs have shown to possess outstanding prediction capability. Most of the best predicting ANNs produce highly accurate results with small RMSEs, MAPEs of less than 10%, and high goodness of fit (𝑅̅2>0.9). While flat plate and flat slab buildings require only 1-2 days to tune the network, the tuning times of surrogate ANNs for beam slab buildings were 3-4 days, which is still short in comparison with the time frame available at initial design phases. Once the models are properly trained, they can predict the design solutions in seconds. Given the reliability of the dataset generated from the optimisation phase as well as the high efficiency and accuracy of the developed ANNs, this innovative framework can assist structural engineers to deliver the most sustainable designs for entire buildings, especially in the short time frames of early design stages.
Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Eng & Built Env
Science, Environment, Engineering and Technology
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15

Borg, Mathias. "Environmental Assessment of Materials, Components and Buildings Building Specific Considerations, Open-loop Recycling, Variations in Assessment Results and the Usage Phase of Buildings." Doctoral thesis, Stockholm : Tekniska högsk, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3232.

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16

Pourakbar, Sharifi Naser. "Application of Phase Change Materials to Improve the Thermal Performance of Buildings and Pavements." Digital WPI, 2017. https://digitalcommons.wpi.edu/etd-dissertations/22.

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In recent decades, much research has investigated the efficiency of Phase Change Materials (PCMs) in improving the thermal performance of buildings and pavements. In buildings, increasing the thermal inertia of structural elements by incorporating PCMs decreases the energy required to keep the inside temperature in the comfort range. In concrete pavements, using PCMs decreases the number of freeze/thaw cycles experienced by the pavement and thus increases service life. However, PCMs cannot be added to cementitious binders directly, because they interfere with the hydration reactions between cement and water that produce strength-bearing phases. Therefore different carriers have been proposed to indirectly incorporate PCMs in cementitious materials. Lightweight Aggregate (LWA) is one of the materials that has been proposed as PCM carrier agent. However, it was not studied in depth before. Various experiments were conducted to investigate the problems associated with incorporating LWA presoaked in PCM in cementitious media. The results show that a portion of PCM leaks out of the LWA’s structure and subsequently affects different chemical, physical, and mechanical properties of the binder. In addition, the applicability of Rice Husk Ash (RHA), a common material never before used to encapsulate PCM, as a PCM carrier agent was investigated. The results show that RHA can absorb and contain liquids in its porous structure; and regarding its compatibility with the cementitious media, it can be used as PCM carrier. Different computational simulations using Typical Meteorological Year data were conducted to evaluate the efficiency of PCMs in improving the thermal performance of buildings. Utilizing PCM-incorporated gypsum boards was shown to be a promising strategy to achieve the governmental plans of “Zero Net Energy� buildings. The results show that using a PCM with a melting point near the occupant comfort zone delays and reduces the inside peak temperature, increases the duration of time during which the inside temperature stays in the comfort zone, and decreases the cost and energy required by HVAC system to keep the inside temperature in this range. However, PCMs’ efficiency is completely dependent on the input temperature profile.
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Malekzadeh, Fatemeh. "Integration of Phase Change Materials in Commercial Buildings for Thermal Regulation and Energy Efficiency." Thesis, The University of Arizona, 2015. http://hdl.handle.net/10150/603534.

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One of prospective procedures of absorbing thermal energy and releasing it during the required time is the application of phase change materials known as PCMs in building envelopes. High thermal energy storage (TES) materials has been a technology that effects the energy efficiency of a building by contributing in using onsite resources and reducing cooling or heating loads. Currently, many TES systems are emerging and contributing in building assemblies, however using an appropriate type of TES in a specific building and climate requires an in-depth knowledge of their properties. This research aims to provide a thorough review of a broad range of thermal energy storage technologies including their potential application in buildings. Subsequently, a comparative study and simulation between a basecase and an optimized model by PCM is thoroughly considered to understand the effect of high thermal storage building's shell on energy efficiency and indoor thermal comfort. Specifically this study proposes that the incorporation of PCM into glazing system as a high thermal capacity system will improve windows thermal performance and thermal capacity to varying climatic conditions. The generated results by eQUEST energy modeling software demonstrates approximately 25% reduction in cooling loads during the summer and 10% reduction in heating loads during the winter for optimized office building by PCM in hot arid climate of Arizona. Besides, using PCM in glazing system will reduce heat gain through the windows by conduction phenomenon. The hourly results indicates the effect of PCM as a thermal energy storage system in building envelopes for building's energy efficiency and thermal regulation. However, several problems need to be tackled before LHTES can reliably and practically be applied. We conclude with some suggestions for future work.
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Solgi, Ebrahim. "Experimental and numerical investigations of phase change material and night ventilation characteristics in buildings." Thesis, Griffith University, 2019. http://hdl.handle.net/10072/389083.

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As a key consumer of energy, and producer of greenhouse gas emissions, the building industry can play a pivotal role in reducing the global energy and carbon footprint. Thus, the application of passive techniques in buildings has gained particular attention. These techniques, with minimal auxiliary energy load, can mediate between the external climate and comfortable indoor conditions, while providing an aesthetically pleasing indoor environment. Thermal energy storage is considered an essential component when using passive techniques. The primary aim of energy storage incorporated into buildings using passive strategies is to implement approaches for efficiently controlling the time lag between building energy demand and outdoor energy sources. Examples of passive strategies are advanced thermal energy storage (TES) and night ventilation (NV). Phase change materials (PCMs) as a salient example of advanced TES, have received remarkable attention for their use in energy-efficient buildings. PCMs, which mainly store energy thorough latent heat, can be conveniently integrated into building envelopes as productive lightweight thermal mass. PCMs have also been of paramount interest as compact components, since they can alleviate building energy loads and be easily coupled with other passive/active systems. Given that the role of TES in ameliorating the effectiveness of passive strategies such as NV is critical, recent years have produced a renewed interest in utilizing PCMs as efficient-lightweight thermal mass in preference to traditional sensible heat storage. Passive cooling techniques, such as NV, with an efficiency that is highly conditional upon thermal mass capacity, have been commonly used in conjunction with sensible thermal mass; however, with the proliferation of PCMs, NV can be reconsidered as an effective cooling strategy for lightweight construction. NV, as a well-established passive cooling strategy, uses the cool of night to release the daily stored heat; then during the subsequent warmer daytime the cooled TES can moderate indoor temperature. In countries with a range of climatic zones such as Australia, where the application of lightweight structures is of great importance, and where energy consumption is mainly targeted at the cooling demand, the use of PCMs and NV can be highly productive and applicable in a wide range of environments. However, very little is currently known in regard to the efficacy and requirements of employing PCMs in different Australian climatic zones, either in isolation or in combination with NVs. This research examines the key variables of PCM-enhanced buildings, such as the material properties and coupled thermal insulation, through a parametric study that includes NV efficiency. An optimal PCM-based TES is closely analysed in four major Australian climates, with respect to building and material characteristics and energy consumption. This dissertation follows experimental verifications, using a full-scale calorimeter, with in-depth numerical simulations of the validated model. This dissertation delivers some insights into the aforementioned TES and NV topics, and makes a contribution to building physics by providing building designers and researchers with the basis for practical applications.
Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Eng & Built Env
Science, Environment, Engineering and Technology
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Wagoner, Jared Wesley. "Performance Evaluation of PCM-in-Walls of Residential Buildings for Energy Conservation." OpenSIUC, 2019. https://opensiuc.lib.siu.edu/theses/2636.

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Phase Change Materials have been the subject of increased research in modern times. Phase Change Materials, abbreviated as PCMs, are being used in a variety of applications in the energy conservation world. In this study, the effect of PCMs on a residential building’s energy consumption was evaluated at different locations across the United States and compared to the standard building at the same locations. An average American residential building was designed and modeled in SketchUp software. The building was evaluated for energy consumption at different locations across the United States using weather data for each chosen location. After the baseline results were collected, the building was re-evaluated, under the same conditions, with a Heptadecane embedded in the exterior walls as the chosen PCM for this study. The results of this study show that Phase Change Materials have a wide-ranging effect on the energy consumption of the designed building. Addition of the PCM to the building walls decreased total energy usage, over the course of a year, by 3.02 – 6.72%, depending on the location.
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Giró, Paloma Jessica. "Characterization of polymers and Microencapsulated Phase Change Materials used for Thermal Energy Storage in buildings." Doctoral thesis, Universitat de Barcelona, 2015. http://hdl.handle.net/10803/346923.

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The use of renewable heat decreases the consumption of fossil resources, although its usage is intermittent and usually does not match the demand. A proper thermal energy storage system design can eliminate this problem by reducing the consumption of non-renewable resources and improving energy efficiency where used. In buildings, thermal energy storage using phase change materials (PCM) is a useful tool to achieve reduction in energy consumption. These can be incorporated into passive or/and active systems. Thus, a proper selection of materials and extensive characterization for its usage in thermal energy storage is critical for new construction systems and for those already constructed. This Thesis is divided in two blocks and presented as a compendium of published articles in scientific journals indexed in Materials, Engineering, and Energy areas. The emphasis is made in the chemical, physical, thermal, mechanical and environmental characterization of PCM, MPCM (microencapsulated phase change materials), and PCS (phase change slurries). The main purpose is to perform an exhaustive characterization of this kind of materials because several scientific studies have highlighted that PCM mixed with construction materials can suffer leakage. Polymeric encapsulation is an alternative for retaining PCM inside building materials, resulting in a system named MPCM. - Macroscopic samples: the nanoindentation tecnique has been used to characterize thermoplastics that, so far, have had few precedents. As mechanical properties of materials are an important criterion for their selection and nanoindentation allows their evaluation, we have studied the hardness and elastic modulus of different polymeric materials through Loubet and Oliver & Pharr methodologies, to discern which is the most suitable concerning the viscoelastic properties. The obtained values by Oliver & Pharr method are based on the unloading curve analysis; in case of Loubet methodology, these values are a function of the penetration depth of the indentation. Also, we have studied the mechanical changes that occur when a polymer that contains a flame retardant is immersed in PCM. It has been observed that using Mg(OH)2 increases rigidity and mechanical strength while reducing the degradation effect and improving the properties against fire. This block contains two scientific published papers. - Microscopic samples: This block is based on MPCM studies. A review of publications related to PCM, MPCM and slurries (PCS) (same shell and different PCM; different shell and same PCM; same shell and same PCM, but different encapsulation ratios) was prepared. Then, the evaluation of the chemical, physical, thermal, mechanical, and environmental properties of different MPCM and PCS samples was performed, concluding that AFM is a useful tool to characterize the stiffness and Young's modulus of MPCM. Because temperature is a key parameter in PCM systems, AFM experiments were carried out at different temperatures, in order to simulate the PCM in solid and/or liquid state. PCS samples were observed using SEM device coupled to a cryogenic system. Besides, environmental properties of PCS have been studied by gas chromatography (VOC’s). In addition, PCS were cycled for the evaluation of the polymeric shell durability after pumping the sample several cycles. Also, the chemical and thermophysical properties before and after pumping the sample were compared. Finally, due to the thermal behavior results of PCS in some performed studies, and depending on the liquid or dried PCS sample, the optimum conditions by means thermogravimetric analysis were evaluated. The second block contains five scientific published articles, one article under review after its first revision, one article finished without being submitted to a journal, and one unfinished research. Finally, the contribution in the state of the art of this PhD Thesis related with thermal energy storage in buildings using PCM, MPCM, and PCS is presented.
Un correcto diseño del sistema de almacenamiento de energía térmica (TES) puede eliminar un uso discontinuo y que habitualmente no coincide con la demanda. El TES mediante materiales de cambio de fase (PCM) en climatización pasiva y activa en edificios es un instrumento útil para alcanzar un descenso del consumo de energía. La Tesis se divide en dos bloques y se presenta como compendio de artículos publicados en revistas científicas indexadas en las áreas de Materiales, Ingeniería, y Energía, haciendo émfasis en la caracterización química, fisica, térmica, mecánica y ambiental de PCM, MPCM (materiales de cambio de fase microencapsulados) y PCS (pulpas con cambio de fase). - Caracterización de diferentes termoplásticos mediante nanoindentación. a través de los métodos de Loubet y Oliver & Pharr. También se han estudiado los cambios mecánicos que se producen cuando un polímero que contiene carga ignifugante en su formulación se sumerge en PCM. Este bloque contiene dos artículos científicos. - Estudio de MPCM. Se ha llevado a cabo una revisión de publicaciones por otros autores. Se han caracterizado con AFM diferentes MPCM y PCS, a diferentes temperaturas. Se han observado muestras de PCS mediante el uso de SEM acoplado a un sistema de crionizado, y se han estudiado las propiedades medioambientales por cromatogyafía de gases. Además, se han ciclado PCS para ver la durabilidad de la pared polimérica después de ciertos ciclos de bombeo. Se han investigado las condiciones óptimas mediante análisis termogravimétrico en PCS. Este segundo bloque contiene cinco artículos científicos publicados, un artículo aceptado en primera revisión, un artículo finalizado sin enviar a revista, y un estudio en investigación. Finalmente, se presentan las conclusiones principales de la contribución de esta Tesis Doctoral en el estado del arte de los PCM, MPCM, y PCS para almacenaje de energía en edificios.
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Briere, Raphaël. "Etude ACV des chantiers de démolition en vue de la préservation des ressources : focus sur les procédés de transport et de décharge." Thesis, Paris Est, 2016. http://www.theses.fr/2016PESC1003/document.

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La préservation des ressources naturelles est un des enjeux majeurs dans les années à venir. Le secteur de la construction tant par les besoins auxquels il répond que par les ressources qu'il mobilise joue un rôle majeur dans ce challenge. Il est alors pertinent de s'intéresser à la fin de vie de bâtiments dont la gestion permet de potentiellement transformer des déchets en matières premières. A l'aide de l'Analyse de Cycle de Vie, il est possible d'estimer les impacts environnementaux de ces chantiers mais surtout d'estimer les bénéfices possibles d'une gestion plus durable. D'une démolition traditionnelle où le tri des déchets n'était pas ou peu réalisé nous sommes passés vers une démolition plus sélective où les différentes catégories de déchets étaient séparées puis envoyées dans les différentes installations et filières de gestion des déchets (plateforme de recyclage, incinérateurs ou installations de stockage par exemple). Le recyclage des déchets est aujourd'hui favorisé notamment pour des matériaux où les bénéfices environnementaux rejoignent ceux économiques comme les métaux. Notre travail a envisagé la réutilisation d'éléments structurels en béton armé en lieu et place d'un recyclage afin d'allonger leur durée de vie et de diminuer les besoins en ressources minérales. La pertinence environnementale de cette solution alternative a été ainsi regardée. Une deuxième contribution se situe au niveau de l'adaptation de données. Dans les différentes analyses ACV menées tout au long de cette thèse, la base Ecoinvent a été utilisée. Cependant, les données fournies sont souvent moyennées ce qui diminue la pertinence de leur utilisation dans un cas spécifique. Le procédé de transport par camion ainsi que celui de mise en décharge ont été étudiés de manière approfondie afin de les adapter à notre cas spécifique des chantiers de démolition situés en France. Dans le cas du transport, il a été nécessaire d'intégrer le retour à vide des camions évacuant les déchets tandis que les installations de stockage françaises ont des infrastructures différentes des décharges de référence suisses. Ainsi, ce travail d'adaptation des données Ecoinvent pourrait être étendue à d'autres modules de transports ou de décharges mais également à d'autres modules Ecoinvent afin de renforcer la pertinence des études ACV
The preservation of natural ressources is one of the biggest concerns for the years to come. The building sector that fulfills the need of a housing for every human being requires a lot of materials. Indeed, this industry plays a crucial role. Then, it seems relevant to study the building end of life which managing can transform waste into ressources. Thanks to the Life Cycle Assessment, it is possible to evaluate the environmental impacts of demolition sites and also to estimate the potential benefits of a more durable managing. From a traditional demolition where waste separation was not or little done, we are now going to a selective demolition where waste sorting is made and the different waste categories are sent to specific installations (recycling platforms, incinerators or landfills for example). Nowadays, waste recyling is being encouraged particularly for materials where the environmental benefits come with the economic ones like for metals. Our work considered the reuse of structural elements in reinforced concrete instead of their recycling. It allows to increase their lifetime while decreasing the need in mineral ressources. The environmental relevance of this solution was studied. The second contribution deals with the data adaptation needed in LCA. During the various LCA studies done in this work, the Ecoinvent database was used. However, the provided data was often too aggregated and consisted in average data which reduces the relevance of using it in specific cases. A deep analysis of the truck transportation and the landfill processes was made as well as the adaptation needed to be coherent with the specific case of demolition sites located in France. In the case of the transport process, the empty returns were more specifically taken into account. For the landfill process, one has to deal with the differences between the french and the swiss infrastructures used as the reference ones. Thus, this data adaptation could be extended to other transport and landfill processes but also to other Ecoinvent processes in order to reinforce the reliability of LCA studies
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Rocha, Cecilia Gravina da. "Proposição de diretrizes para ampliação do reuso de componentes de edificações." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2008. http://hdl.handle.net/10183/13511.

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A indústria da construção é uma das maiores geradora de resíduos e consumidoras de recursos naturais. A importância de se pesquisar estratégias (tais como reciclagem e reuso) de forma a re-integrar materiais e componentes na cadeia produtiva é apresentada na literatura. A adoção dessas estratégias permite a criação de um modelo de produção fechado ou cíclico, que é fundamental para o desenvolvimento sustentável. Assim, o objetivo principal desse trabalho é propor diretrizes para ampliação do reuso de componentes de edificações. O objetivo secundário é identificar os principais fatores que podem restringir ou favorecer o processo de reuso. A estratégia de pesquisa empregada é um estudo de caso incorporado. A unidade de análise principal é a cadeia de suprimentos de demolição de edificações de Porto Alegre, enquanto que a unidade de análise secundária é uma cadeia de suprimentos de empreendimentos. As principais fontes de evidência utilizadas são: observação direta e participante, entrevistas e análise documental e de artefato. O problema é investigado a partir de quatro perspectivas (técnica, econômica, legal e social), de forma a abordar a complexidade desse e compreender as interdependências entre os referidos fatores. Alguns pontos abordados, relativos ao aspecto técnico, referem-se à técnica construtiva e às relações hierárquicas das partes da edificação. Já, a abordagem da gestão da cadeia de suprimentos é utilizada para modelar o processo de reuso e compreender os fatores sociais, econômicos e legais. Ao final, é proposta uma séria de diretrizes, que variam em relação à natureza (técnica, econômica, legal e social), escala e facilidade de implementação, visando ampliar o reuso de componentes de edificações.
The construction industry is one of the major waste generators and consumers of natural resources. The importance of researching alternatives (such as recycling and reuse) to reenter building materials and components into the production chain are presented in the literature. The adoption of these alternatives enables the creation of a closed loop production model, which is crucial for sustainable development. Therefore, the main goal of this study is to propose guidelines to improve and ease building components reuse. The secondary goal is to identify the main factors which can constrain or improve components reuse process. The research strategy employed is an embedded case study. The main unit of analysis is the building demolition supply chain or demolition sector in the city of Porto Alegre, while the secondary unit of analysis is a project supply chain. The main sources of evidences used are: direct and participatory observation, interviews and artifact and documental analysis. The problem is investigated through four main perspectives (technical, economical, legal and social) in order to address its complexity and also to understand the interdependence between the factors. Some issues addressed, regarding the technical aspect are the building deconstruction potential, regarding its construction techniques and the parts hierarchical relation. The supply chain approach is used to model the building components reuse process and investigate the social, legal and economical factors. Finally, several guidelines are proposed, which vary in nature (technical, social, economical and legal), scale and ease of implementation.
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Andersson, Anna-Lotta, and Emelie Andersson. "Att neka rivningslov enligt PBL 9 kap. 34 § 2." Thesis, Högskolan Väst, Avdelningen för Matematik, Data- och Lantmäteriteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-15793.

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För att skydda kulturhistoriskt värdefulla byggnader från rivning används PBL 9 kap. 34 § 2 om byggnaden är placerad inom detaljplan eller områdesbestämmelser. Förarbeten till paragrafen är tydliga med att vad som definieras som kulturhistoriskt ska avgöras med hänsyn till lokala överväganden. När en ansökan om rivningslov inkommer till kommunen ska den prövas mot PBL 9 kap. 34 § 2. För att kunna neka rivning ska byggnaden uppfylla rekvisitet kulturhistoriskt värdefull. Det kulturhistoriskt värdefulla kan vara byggnaden i sig eller den helhetsmiljö byggnaden är en del utav. För att styrka det kulturhistoriska värdet används utlåtanden från muséer, kulturinventeringar, privata företag med bebyggelseantikvarisk kompetens och kommunens egna planer. Kommunernas kulturhistoriska planer och program är inte alltid uppdaterade, vilket ställer högre krav på kunskapen om kulturhistoriskt värdefulla byggnader hos kommunernas tjänstepersoner. Studien tyder på att det finns en varierande kunskapsnivå bland tjänstepersonerna som deltagit i enkätundersökningen, i vissa fall förekommer feltolkningar av lagen. Det går inte att härleda kunskapsnivån till varken utbildning eller erfarenhet inom yrket. När tjänstepersonerna brister i kunskapen försvårar det kommunernas förutsättningar att följa lagens intentioner. För bedömning av en byggnads kulturhistoriska värde är bebyggelseantikvarisk kompetens till stor hjälp. Kommunerna bör uppdatera och utöka inventeringen av kulturhistoriskt värdefulla byggnader för att kunna göra kvalificerade avvägningar när det gäller att neka eller bevilja rivningslov. Studien visar på brister när det gäller kommunens information till fastighetsägare om fastighetsägarens rättighet till ersättning vid nekat rivningslov. Det är dessutom ovanligt att kommunerna budgeterar för denna ersättning. Det är svårt att avgöra varför kommunerna brister i informationen till fastighetsägarna och om bristen av budget leder till sämre information. Faktum kvarstår dock, kommunen är skyldig att ersätta fastighetsägaren om skadan av det nekade rivningslovet uppfyller kvalifikationsgränsen betydande skada i förhållande till värdet på berörd del av fastigheten. Lagstiftningen är tydlig, men kunskapen behöver spridas bland Sveriges kommuner för att i större utsträckning möjliggöra bevarandet av kulturhistorsikt värdefulla byggnader.
To protect culturally valuable buildings from demolition Planning and Building Act chapter 9 section 34 p. 2 is used if the building is located within the detailed development plan or area regulations. Preparatory work on the section is clear that what is defined as cultural history must be decided regarding local considerations. When an application for demolition permit is submitted to the municipality, it must be tested against Planning and Building Act chapter 9 section 34 p. 2. To deny demolition, the building must meet the cultural heritage prerequisite. The cultural-historical value may be the building itself or the overall environment the building is part of. To prove the cultural-historical value, statements from museums, cultural inventories, private companies with building antiquarian competence and the municipality's own plans are used. The municipalities' cultural history plans and programs are not always updated, which places higher demand on the knowledge of culturally valuable buildings in the municipal's officials. The study indicates that there is a varying level of knowledge among the officials who participated in the survey, in some cases there are misinterpretations of the law. It is not possible to deduce the level of knowledge neither to education nor experience in the profession. When the officials knowledge is not sufficient municipalities make desitions in conflict with the intentions of the law. The competence of conservation officers is of good help for the building committee in assessing the cultural historical value of a buildning. Municipalities should update and expand the inventory of culturally valuable buildings to be able to make qualified assesments when it comes to denying or granting demolition permits. This study shows deficiencies in the municipality's information to property owners about their rights to compensation in the event of a denied demolition permit. Furthermore, it is unusual for municipalities to budget for this compensation. It is difficult to determine why the municipality's lack in information to property owners and whether the lack of budget leads to deficient information. However, the fact remains, the municipality is obliged to compensate the property owner if the damage of the refused demolition permit meets the qualification, significant damage in relation to the value of the affected part of the property. The legislation is clear, but the knowledge needs to be spread among Sweden's municipalities in order to enable the preservation of culturally valuable buildings.
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Navarro, Farré Lidia. "Thermal energy storage in buildings through phase change materials (PCM) incorporation for heating and cooling purposes." Doctoral thesis, Universitat de Lleida, 2016. http://hdl.handle.net/10803/398840.

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La reducció del consum energètic dels sistemes de calefacció i refrigeració dels edificis és un repte fonamental per assolir els objectius marcats per l’Horitzó 2020. Noves aplicacions d'emmagatzematge d'energia tèrmica en edificis es mostren prometedores per reduir aquest elevat consum energètic. Un dels objectius d'aquesta tesi doctoral és revisar les aplicacions passives i actives d'emmagatzematge d'energia que es troben en la literatura, especialment aquelles que utilitzen materials de canvi de fase (PCM). En aplicacions passives els requeriments de confort i les condicions climàtiques són els principals paràmetres que s’han tingut en compte fins ara. Per això s'estudia la influència de càrregues internes en el aplicacions passives de PCM. D'altra banda, es presenta un sistema innovador que actua com una unitat d'emmagatzematge tèrmic i alhora com un sistema de calefacció i refrigeració. El rendiment tèrmic d'aquest sistema es testeja sota condicions reals i s'avalua el seu potencial de reducció del consum d'energia.
La reducción del consumo energético de calefacción y refrigeración de los edificios es un reto para lograr los objetivos marcados por el Horizonte 2020. Nuevas aplicaciones de almacenamiento de energía térmica en edificios se muestran prometedoras para reducir este elevado consumo energético. Uno de los objetivos de esta tesis doctoral es revisar aplicaciones pasivas y activas de almacenamiento de energía que se encuentran en la literatura, especialmente aquellas con materiales de cambio de fase (PCM). En aplicaciones pasivas los requerimientos de confort y las condiciones climáticas son los principales parámetros que se han tenido en cuenta hasta ahora. Se estudia la influencia de cargas internas en aplicaciones pasivas de PCM. También, se presenta un sistema innovador que actúa como una unidad de almacenamiento térmico y como calefacción y refrigeración. El rendimiento térmico de este sistema se testea bajo condiciones reales y evalúa su potencial de reducción del consumo energético.
Reducing the energy consumption of heating and cooling systems of buildings is a key challenge to achieve the targets set for the Horizon 2020. New applications of thermal energy storage in buildings are promising to reduce the high energy consumption. One of the objectives of this PhD is to review passive and active applications of thermal energy storage in buildings found in the literature, especially those that use phase change materials (PCM). In passive applications comfort requirements and climatic conditions are the main parameters that have been considered so far. For this study, the influence of internal loads has been taken into account in passive PCM applications. Moreover, an innovative system which acts as a storage unit and a heating and cooling supply is presented. The thermal performance of this system is studied and the potential in reducing the energy consumption of heating and cooling is evaluated.
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Politi, Stefano <1988&gt. "Buildings Embodied Impacts over the Life Cycle: an Essential Assessment Framework for the Early Design Phase." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amsdottorato.unibo.it/9055/1/Politi_Stefano_tesi.pdf.

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The present thesis project revolves around recognition of the critical environmental footprint generated by constructions, from their conception to their disposal. The first part of the research therefore centered on the study of the environmental consequences arising from the construction industry through the analysis of the sustainability assessment protocols or green buildings rating systems (GBRSs), identifying a “set core” of representative categories and indicators of buildings’ sustainability. As a consequence of a number of evidences emerged from the analysis upon the “embodied impacts” (not related to buildings operation) this research centered on the Life Cycle Assessment (LCA) methodology, which emerged as an appropriate tool to measure such impacts. A second analysis of GBRS frameworks was conducted in order to identify the most distinctive aspects, providing a shared buildings LCA framework and underlining several discrepancies in how the method is applied within a wide context and regarding the interpretation of the results. The last part of the thesis, therefore, dealt with the development of a simplified approach capable of overcoming the drawbacks that emerged in order to facilitate the environmental evaluation, from both a methodological and operational point of view, during the early phases of the process which turned out to be particularly significant stages for describing the environmental profiles of buildings. With respect to the complexity of the LCA assessment for non-expert practitioners, implementation of the proposed framework within the Building Information Modelling (BIM) environment was investigated resulting in the development of a customizable and convenient LCA-BIM integration approach. The research concluded with an illustrative application to a case study in order to test the proposed LCA-BIM integration, intending to demonstrate the process and, at the same time, identify and discuss the potential advantages and disadvantages of such a method with a view of future developments.
Il progetto di ricerca presentato in questa tesi di dottorato è incentrato sul tema della determinazione e della valutazione del profilo ambientale degli edifici durante il loro ciclo di vita. Inizialmente la ricerca si è concentrata sullo studio degli effetti ambientali ascrivibili agli edifici attraverso i protocolli di valutazione della sostenibilità (Rating Systems) identificando un "nucleo" di categorie e indicatori rappresentativi della sostenibilità degli edifici. A seguito di alcune considerazioni emerse dall’analisi sugli “impatti inglobati” (non ascrivibili alle fasi operative), la ricerca si è orientata sulla metodologia Life Cycle Assessment (LCA), individuata come uno strumento appropriato per la misura di questo tipo di impatti. Una seconda analisi dei protocolli di sostenibilità è stata condotta al fine di individuare gli aspetti più distintivi dell’LCA in riferimento alle applicazioni sull’ambiente costruito, delineando una serie di requisiti condivisi ed evidenziando alcune discrepanze nell’applicazione del metodo in contesti eterogeni e nell'interpretazione dei risultati. L'ultima parte della tesi, quindi, affronta lo sviluppo di un approccio condiviso e semplificato volto a superare i limiti emersi e facilitare le valutazioni ambientali, sia da un punto di vista metodologico che operativo. In particolare, l’approccio è stato ideato per essere applicato durante le prime fasi del processo costruttivo (progettazione), considerate determinanti nella configurazione dei profili ambientali degli edifici. In merito alla complessità dello svolgimento delle analisi per gli utenti meno esperti, è stata studiata l’integrazione del framework proposto con gli strumenti Building Information Modeling (BIM), attraverso lo sviluppo di un flusso di lavoro personalizzabile e conveniente. La ricerca si è conclusa con l'applicazione sperimentale del metodo su un caso studio al fine di testare il flusso di lavoro proposto per l'integrazione tra LCA e BIM, mostrandone il processo operativo, individuandone e discutendone i potenziali vantaggi e svantaggi in vista di successivi approfondimenti e sviluppi.
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26

With, Christoffer. "Train-Induced Vibrations on Embankments and in Buildings : Prediction and Validation of Some Models." Doctoral thesis, Stockholm : Division of Soil and Rock Mechanics, Royal Institute of Technology, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4810.

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Wang, Xichun. "Application of MPCM slurry with cooled ceiling to realize a low energy building design." online access from Digital Dissertation Consortium, 2008. http://libweb.cityu.edu.hk/cgi-bin/er/db/ddcdiss.pl?3341125.

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28

Erdurmus, Salih Bugra. "Benefit-cost Analysis For Retrofitting Of Selected Residential Buildings In Istanbul." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606817/index.pdf.

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During the evaluation of the seismic retrofitting option for risk reduction/mitigation measures to be applied over buildings, Benefit Cost Analysis is an often-used method. During this study of Benefit Cost Analysis, the condition that the earthquake can happen just after or sometime after retrofitting will be taken into consideration rather than some approaches that focus on the benefits and costs regarding the annual probability of the occurrence for possible earthquakes. The analysis will use conditional probability such that the earthquake will be assumed to occur at different periods of time (5, 10, 20 years etc.) after the mitigation measures are taken so that benefit-cost ratios and net social benefits can be observed over time using the results at these periods. Also during this study the indirect effects of earthquake such as business disruption, social disturbance will also be taken into consideration. As a final step, it is aimed to conclude with convincing financial results regarding the direct and indirect effects of the earthquake in terms of benefits and costs to encourage people and the public officials to reduce the potential vulnerability of the housing units people live by taking the necessary precautions against the earthquake.
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Mer'eb, Muhammad Musa. "Greenometer-7 a tool to assess the sustainability of a building's life cylce at the conceptual design phase /." Cleveland, Ohio : Cleveland State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=csu1209184917.

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Thesis (D.Eng.)--Cleveland State University, 2008.
Abstract. Title from PDF t.p. (viewed on May 8, 2008). Includes bibliographical references (p. 321-343). Available online via the OhioLINK ETD Center. Also available in in print.
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30

Barreneche, Güerisoli Camila. "Development and characterization of new materials incorporating phase change materials (PCM) for thermal energy storage (TES) applications in buildings." Doctoral thesis, Universitat de Lleida, 2013. http://hdl.handle.net/10803/123749.

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Actualment, la demanda d'energia per satisfer el confort tèrmic en edificació és un dels majors reptes per a les administracions. Per tant, l'eficiència dels diferents sistemes d'emmagatzematge d'energia s està investigant intensament per la comunitat científica. Una alternativa viable és l'ús de materials de canvi de fase (PCM). Les parafines han estat molt utilitzades com PCM per la seva alta capacitat d'emmagatzematge de calor (al voltant de 100-130 kJ·kg-1) i la seva baixa temperatura de fusió la qual és molt estable. A més, el consum d'energia i les oscil·lacions de la temperatura internes d'edificis es poden reduir quan un PCM s'incorpora en evolvents. L'objectiu principal d'aquesta tesi és el desenvolupament de nous materials que continguin PCM basant-se en l'estudi del procés per obtenir la correcta introducció del PCM dins el material. A més, les propietats termofísiques d'aquests nous materials s'han de conèixer i per tant caracteritzar a nivell de laboratori. Aquesta tesi doctoral se centra en els treballs publicats en revistes científiques amb alt factor d'impacte indexats al camp de l Energia els quals reflecteixen treball realitzat. D'altra banda, aquesta tesi conté una revisió de l'estat de l'art destacant els requisits per a un PCM i llista tots els tipus de PCM disponibles al mercat i utilitzats en investigació. D'altra banda, un nou concepte de material compost que incorpora PCM ha estat desenvolupat en aquesta tesi. Aquest compost té la matriu polimèrica, i inclou un residu del procés de reciclatge de l acer. D'aquesta manera s'obtenen làmines denses que es poden modelar. La fabricació d'aquest material podria considerar-se un mètode per a la reutilització d'aquest residu. D'altra banda, aquest tipus de residus conté òxids de metalls pesants que augmenten les propietats d'aïllant acústic de la làmina aconseguint millorar el resultat final de la solució constructiva. A més, el comportament termofísico dels materials compostos utilitzats en edificis és difícil de caracteritzar i l'anàlisi tèrmica dels PCM és un pas necessari per al disseny dels mateixos. Les dues primeres caracteritzacions termofísiques estudiades en aquesta tesi es van realitzar mitjançant corbes calorimètriques que és una de les tècniques més potents disponibles actualment. tres estudis més van ser van realitzar amb dispositius desenvolupats per diferents grups d'investigació a Espanya per tal de mesurar les propietats termofísiques dels materials compostos o materials multicapa que incorporen PCM.
Hoy en día, la demanda de energía para satisfacer el confort térmico en edificación es uno de los mayores desafíos para las administraciones. Por lo tanto, la eficiencia de los diferentes sistemas de almacenamiento de energía está siendo intensamente investigado por la comunidad científica. Una alternativa viable es el uso de materiales de cambio de fase (PCM). La parafina ha sido muy usada como PCM debido a su alta capacidad de almacenamiento de calor (alrededor de 100-130 kJ·kg-1) y a su baja temperatura de fusión la cual es muy estable. Además, el consumo de energía y las oscilaciones de la temperatura internas se pueden reducir cuando un PCM se incorpora en envolventes de edificios. El objetivo principal de esta tesis es el desarrollo de nuevos materiales que contengan PCM basándose en el estudio del proceso para obtener la correcta introducción del PCM. Además, las propiedades termofísicas de estos nuevos materiales se debe conocer y por tanto caracterizar a nivel de laboratorio. Esta tesis doctoral se centra en los trabajos publicados en revistas científicas con alto factor de impacto indexados en el campo de Energía los cuales reflejan el trabajo realizado. Por otra parte, esta tesis contiene una revisión del estado del arte destacando los requisitos para un PCM y lista todos los tipos de PCM comercializados y utilizados en investigación. Por otra parte, un nuevo concepto de material compuesto que incorpora PCM ha sido desarrollado en esta tesis. Este compuesto tiene la matriz polimérica, e incluye un residuo del proceso de reciclaje de acero. De este modo se obtienen láminas densas moldeables. La fabricación de este material podría considerarse un método para la reutilización de este residuo. Por otra parte, este tipo de residuos contiene óxidos de metales pesados que aumentan las propiedades de aislante acústico de la lámina consiguiendo mejorar el resultado final de la solución constructiva. Además, el comportamiento termofísico de los materiales compuestos utilizados en edificios es difícil de caracterizar y el análisis térmico de los PCM es un paso necesario para el diseño de los mismos. Las dos primeras caracterizaciones termofísicas estudiadas en esta tesis se realizaron mediante calorimetría diferencial de barrido que es una de las técnicas más potentes disponibles actualmente. tres estudios más fueron realizaron con dispositivos desarrollados por diferentes grupos de investigación en España con el fin de medir las propiedades termofísicas de los materiales compuestos o materiales multicapa que incorporan PCM.
Nowadays, energy demand to satisfy thermal comfort in buildings is one of the major challenges for governments and administrations. Therefore, energy storage system efficiency is being studied by the international scientific community. A feasible alternative is the use of phase change materials (PCM). Paraffin waxes have been used as PCM because of their high heat storage capacity (around 100-130 kJ·kg"1) and their low and stable melting temperature. Furthermore, the energy consumption and indoor oscillations temperature may be reduced when PCM is incorporated in building envelopes and the thermal inertia increment when PCM is combined with thermal insulation was widely studied. The main objective of this thesis is the development of new materials containing PCM based on the study of process to get the correct PCM introduction. In addition, thermophysical properties of these new materials must be characterized. In order to perform the characterization, it was used several developed devices. This PhD thesis is based on papers published in scientific journals with high impact factor in the Energy field and one patent that reflect the work performed. This thesis contains a review of the state of the art highlighting the requirements order to a certain PCM and lists and sorts all PCM available in the market and used in research. On the other hand, a new concept of composite material incorporating PCM is developed in this thesis. This composite has polymeric matrix and includes one waste from the steel recycling process obtaining mouldable dense sheets. The manufacture of this material is considered a way to reuse the waste. Furthermore, this waste contains heavy metals oxides which add acoustic insulation properties to the final constructive system. One patent and two papers are the main result. Moreover, thermophysical behaviour of composite materials used in buildings envelopes is difficult to characterize. In addition, PCM thermal analysis is a necessary step of building design as well as it will be a key point in the final thermal results of the envelope. The first two thermophysical characterizations studied in this thesis were performed using differential scanning calorimetry which is one of the most powerful techniques. Three more studies were performed using devices developed by different research groups in Spain in order to measure thermophysical properties of composite materials or multilayered materials incorporating PCM.
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31

Faheem, Ahmed. "Behaviour of ventilated hollow core slabs for improving the energy efficiency of office buildings." Thesis, The University of Sydney, 2016. http://hdl.handle.net/2123/15284.

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Ventilated hollow core slabs (VHCSs) have shown to reduce energy requirements in building heating and cooling applications, as they enhance the use of building thermal mass by increasing the contact between the ventilation air and the structure. This thesis aims to contribute towards the accurate modelling of VHCSs for evaluating their thermal performance for building cooling applications under hot climatic conditions. For this purpose, a numerical procedure is developed for the prediction of the thermal performance of VHCS units. A turbulence model suitable for this purpose is identified first by assessing the ability of five different turbulence models to predict the dimensionless velocity and temperature profiles as well as the Nusselt numbers in a horizontal pipe subjected to turbulent mixed convection conditions typical of VHCSs. The Standard k-ε model showed the best performance, and as such, it is adopted to model the thermal performance of a VHCS geometry for which experimental thermal responses are reported in the literature. The numerical predictions of local temperatures within the VHCS agreed well with the experimental measurements, and hence the Standard k-ε model is adopted here for the modelling of VHCSs. The validated numerical approach is firstly applied to evaluate the impact integrating various types of micro-encapsulated phase change materials in VHCSs on their daily thermal performance in terms of the slab’s cooling potential when ventilated at night using naturally cold air under two ideal room temperature conditions. Analysis is also carried out towards quantifying how the ‘inter-interconnections’ of the hollow cores contribute to the thermal behaviour of VHCSs. The geometry is then simplified to represent a segment of a standard VHCS to evaluate the ability of the slab’s geometric parameters and the inclusion of thin metal sheeting on its hollow core and bottom surfaces to improve the slab’s cooling potential in office building applications.
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32

Soibelman, Lucio 1961. "The exploration of an integrated representation for the conceptual phase of structural design for tall buildings through distributed multi-reasoning algorithms." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/10134.

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33

Darle, Maria, Saga Lindqvist, and Bezawit Tsegai. "The climate impact of different building systems : A study regarding materials in residential buildings and their environmental impact." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-390024.

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This report was done on behalf of Uppsala municipality with the aim to investigate how much the CO2-equivalent emissions differ between different building systems during the construction phase, considering the different choice of material used in the frames. Several multi-family houses with different building systems were therefore studied and compared by using previous LCA from collected climate reports regarding each construction project. Different scenarios of the residential development in Uppsala until year 2050, including multi- and single-family houses, were further on brought forward. The impact that the choice of material had on the climate was then studied by comparing the scenarios with the climate goals set up by Uppsala municipality regarding the construction sector. This was discussed in order to investigate whether Uppsala municipality would reach the climate goals or not. The conclusion of the study is that the building systems with wooden frames in general release less CO2-equivalent emissions than the ones with concrete frames. One of the reasons for this is that the production of the materials has different amounts of waste and the fact that concrete consists of cement, which causes a lot of emissions during the production of the material. Another part of the report was to investigate if climate improved concrete could decrease the CO2-equivalent emissions from building systems with concrete frames. This was done by doing a case-study, where parts of the concrete frame for one of the building systems were replaced, which resulted in a small decrease of the emissions. It is however, in a larger perspective, important to reduce the emissions as much as possible and there is still room to continue the improvement of concrete.
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34

Di, Palma Debora. "Progressive collapse of concrete structures during construction phase: analysis and measures for risk reduction." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.

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Shoring systems are used as temporary support for structures under construction and their primary function is to support and transmit various types of loads. To optimize this phase it has been developed a technique known as Clearing or partial Striking; it consists in removing a percentage of shores few days after the casting such that the load is redistributed between the slab and the remaining shores. In this way the shores removed in one floor can be used to start building the upper one. It is thus really important to conceive the process in a proper way assuring that the whole system is able to support the loads acting on it. This is the reason for which there is a prudent need to understand which conditions lead to the collapse of shoring systems and what measures can impounded in the design process to mitigate the risk of failure. The aim of this thesis is to perform a progressive collapse analysis, during the construction phase of the building, by instantly removing one or several primary load bearing elements and analyzing the structure’s remaining capability to absorb the damage. The analysis have been performed varying load conditions and slab thicknesses and, once the results from standard shores cases have been obtained, calculations with load limiters have been performed. The entire study has been developed with finite elements by means of ANSYS APDL starting from a FE model developed by Alvarado (2010). The important aspect of this investigation has been the risk reduction of progressive collapse, in particular it has been analyzed the behavior performed by the structure when enhanced support systems are used. Along with the finite element study it has been taken part in a experimental study aimed at analyze the load transmission in enhanced shoring system.
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35

Batagar, Amina. "Assessing the thermal performance of phase change materials in composite hot humid/hot dry climates : an examination of office buildings in Abuja-Nigeria." Thesis, University of Newcastle upon Tyne, 2013. http://hdl.handle.net/10443/2146.

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The aim of this study is to investigate the possibility of using Phase Change Materials (PCM) in improving indoor thermal comfort while conserving electricity in office buildings in the composite Hot Humid/Hot Dry climate of Abuja, Nigeria. The first stage is a quantitative investigation of electricity consumption in 15 Nigerian office Buildings. Purpose-built mechanically cooled office buildings are selectively chosen across major Nigerian cities and climates. The surveyed data is analysed and used to construct a hypothetical office building as a base case. Scientifically validated software DesignBuilder v3 and EnergyPlus V6 and V7 are used for the parametric analysis of simulation results. The building simulations are used in two stages, firstly to test passive and climatically responsive scenarios to reduce electricity consumption then secondly to study the potential benefit of incorporating PCM in the building fabric and its effect on thermal comfort and electricity conservation. Results show that cooling, lighting, and appliance loads account for approximately 40%, 12% and 48% respectively of electricity consumption in the buildings audited. Power outages are frequently experienced necessitating alternative power usage. A data collection method is presented for energy auditors in locations where alternative back-up power is essential. Simulation results indicate that the magnitude of energy saving can be achieved by optimizing the passive and climate sensitive design aspects of the building and an electricity saving of 26% is predicted. Analysis indicates that it is difficult to achieve thermal comfort in office buildings in Abuja without mechanical cooling. Adding such a PCM to the building fabric of a cyclically cooled mechanical building may alleviate indoor discomfort for about 2 hours in case of power outage and is predicted to save 7% of cooling load. Cyclic cooling is the cooling of the interiors long enough to maintain comfort for a maximum duration within the working hours. The use of lightweight partitions instead of the heavyweight ones common in Nigeria is shown to a 2-fold improvement in consumption. Adding a PCM to light-weight partition walls with transition temperature of 24°C, conductivity of 0.5W/m K, and a thickness of 10mm gives the best predicted energy savings.
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36

Boozula, Aravind Reddy. "Use of Bio-Product/Phase Change Material Composites in the Building Envelope for Building Thermal Control and Energy Savings." Thesis, University of North Texas, 2008. https://digital.library.unt.edu/ark:/67531/metadc1248391/.

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This research investigates the bio-products/phase change material (PCM) composites for the building envelope application. Bio-products, such as wood and herb, are porous medium, which can be applied in the building envelope for thermal insulation purpose. PCM is infiltrated into the bio-product (porous medium) to form a composite material. The PCM can absorb/release large amount of latent heat of fusion from/to the building environment during the melting/solidification process. Hence, the PCM-based composite material in the building envelope can efficiently adjust the building interior temperature by utilizing the phase change process, which improves the thermal insulation, and therefore, reduces the load on the HVAC system. Paraffin wax was considered as the PCM in the current studies. The building energy savings were investigated by comparing the composite building envelope material with the conventional material in a unique Zero-Energy (ZØE) Research Lab building at University of North Texas (UNT) through building energy simulation programs (i.e., eQUEST and EnergyPlus). The exact climatic conditions of the local area (Denton, Texas) were used as the input values in the simulations. It was found that the EnergyPlus building simulation program was more suitable for the PCM based building envelope using the latent heat property. Therefore, based on the EnergyPlus simulations, when the conventional structure insulated panel (SIP) in the roof and wall structures were replaced by the herb panel or herb/PCM composite, it was found that around 16.0% of energy savings in heating load and 11.0% in cooling load were obtained by using PCM in the bio-product porous medium.
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37

Boozula, Aravind Reddy. "Use of Bio-Product/Phase Change Material Composite in the Building Envelope for Building Thermal Control and Energy Savings." Thesis, University of North Texas, 2018. https://digital.library.unt.edu/ark:/67531/metadc1248391/.

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This research investigates the bio-products/phase change material (PCM) composites for the building envelope application. Bio-products, such as wood and herb, are porous medium, which can be applied in the building envelope for thermal insulation purpose. PCM is infiltrated into the bio-product (porous medium) to form a composite material. The PCM can absorb/release large amount of latent heat of fusion from/to the building environment during the melting/solidification process. Hence, the PCM-based composite material in the building envelope can efficiently adjust the building interior temperature by utilizing the phase change process, which improves the thermal insulation, and therefore, reduces the load on the HVAC system. Paraffin wax was considered as the PCM in the current studies. The building energy savings were investigated by comparing the composite building envelope material with the conventional material in a unique Zero-Energy (ZØE) Research Lab building at University of North Texas (UNT) through building energy simulation programs (i.e., eQUEST and EnergyPlus). The exact climatic conditions of the local area (Denton, Texas) were used as the input values in the simulations. It was found that the EnergyPlus building simulation program was more suitable for the PCM based building envelope using the latent heat property. Therefore, based on the EnergyPlus simulations, when the conventional structure insulated panel (SIP) in the roof and wall structures were replaced by the herb panel or herb/PCM composite, it was found that around 16.0% of energy savings in heating load and 11.0% in cooling load were obtained by using PCM in the bio-product porous medium.
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38

Panayiotou, Gregoris. "Thermal performance of dwellings in Cyprus and approaches for energy conservation." Thesis, Brunel University, 2014. http://bura.brunel.ac.uk/handle/2438/9204.

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Energy has always been the dominant driving force for the socio-economic development of mankind. Nowadays, the global energy system is highly depended on fossil fuels. A great share of the final energy consumption, over 40%, in the EU-27 is consumed by the existing building stock whereas dwellings account for 66.62% of this. Thus, the need to increase the energy performance of dwellings is an important instrument in the efforts to lessen Europe’s energy dependency. In order to define measures to increase the energy performance of dwellings a deeper understanding of their characteristics should be gained. Unfortunately, in Cyprus there is a gap in knowledge on this aspect. In this thesis the characteristics of the dwellings in Cyprus are defined through a sample of 500 dwellings. The results revealed that more than 80% of dwellings in Cyprus do not have thermal insulation installed on their envelope. From this it is clear that the definition of the optimum thermal insulation material to be applied in dwellings is very important. Thus, the commercially available thermal insulation materials and topologies used in Cyprus were reviewed and defined through a market survey and the typical dwelling was modelled. The effect of the application of thermal insulation to its energy behaviour was simulated using TRNSYS. This resulted in the definition of the optimum thermal insulation materials and topologies to be applied in both new and existing dwellings. Accordingly, the application of advanced commercially available materials such as Phase Change Materials (PCM) to the envelope of the typical dwelling was investigated. The energy savings achieved by the addition of a PCM layer on the envelope of the typical dwelling was found to be 28.6%. The optimum PCM case was also combined with the optimum thermal insulation combination and an energy saving of 68% was predicted. The incorporation of Renewable Energy Sources (RES) to the typical dwelling was also simulated and studied. Specifically, two types of standalone RES systems were initially evaluated; a solely photovoltaic (PV) system and a hybrid PV-Wind system. The results showed that the solely PV system is a much better option due to the very high solar potential of Cyprus in comparison to the poor wind profile of the island. Subsequently, a grid-connected PV system was also evaluated and the results showed that when a RES system is grid-connected the cost of the system is reduced to half of that of the standalone cases. This research has revealed that the optimum topology combinations to be applied in both new and existing dwellings in Cyprus is thermal insulation plaster or thermal insulation bricks (only for new dwellings) on the external walls combined with expanded polystyrene on the roof. These results will provide valuable information that will assist both engineers and architects in the efficient design of dwellings in Cyprus. The investigation of the application of macroencapsulated PCM showed that these materials are not yet an economically viable solution for application in Cyprus The findings also show that a solely PV system is the optimum RES system to be applied in Cyprus especially when it is grid-connected. The findings of this project are useful for individuals, house builders and designers as well as policy makers for the design of energy saving subsidy schemes.
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Campbell, Kevin Ryan. "Phase Change Materials as a Thermal Storage Device for Passive Houses." PDXScholar, 2011. http://pdxscholar.library.pdx.edu/open_access_etds/201.

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This study describes a simulation-based approach for informing the incorporation of Phase Change Materials (PCMs) in buildings designed to the "Passive House" standard. PCMs provide a minimally invasive method of adding thermal mass to a building, thus mitigating overheating events. Phase change transition temperature, quantity, and location of PCM were all considered while incrementally adding PCM to Passive House simulation models in multiple climate zones across the United States. Whole building energy simulations were performed using EnergyPlus from the US Department of Energy. A prototypical Passive House with a 1500 Watt electric heater and no mechanical cooling was modeled. The effectiveness of the PCM was determined by comparing the zone-hours and zone-degree-hours outside the ASHRAE defined comfort zone for all PCM cases against a control simulation without PCM. Results show that adding PCM to Passive Houses can significantly increase thermal comfort so long as the house is in a dry or marine climate. The addition of PCM in moist climates will not significantly increase occupant comfort because the majority of discomfort in these climates arises due to latent load. For dry or marine climates, PCM has the most significant impact in climates with lower cooling degree-days, reducing by 93% the number of zone-hours outside of thermal comfort and by 98% the number of zone-degree-hours uncomfortable in Portland, Oregon. However, the application of PCM is not as well suited for very hot climates because the PCM becomes overcharged. Only single digit reductions in discomfort were realized when modeling PCM in a Passive House in Phoenix, Arizona. It was found that regardless of the climate PCM should be placed in the top floor, focusing on zones with large southern glazing areas. Also, selecting PCM with a melt temperature of 25°C resulted in the most significant increases in thermal comfort for the majority of climates studied.
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40

Huang, Ming Jun. "The application of computational fluid dynamics (CFD) to predict the thermal performance of phase change materials for the control of photovoltaic cell temperatures in buildings." Thesis, Ulster University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.248684.

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41

Houl, Yassine. "Increasing Effective Thermal Resistance of Building Envelope's Insulation Using Polyurethane Foam Incorporated with Phase Change Material." Thesis, University of North Texas, 2019. https://digital.library.unt.edu/ark:/67531/metadc1505159/.

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Incorporating insulation material with phase change materials (PCMs) could help enhance the insulation capability for further building energy savings by reducing the HVAC loadings. During the phase change process between the solid and liquid states, heat is being absorbed or released by PCMs depending on the surrounding temperature. This research explores the benefits of a polyurethane (PU)-PCM composite insulation material through infiltrating paraffin wax as PCM into PU open cell foam. The new PU-PCM composite provides extra shielding from the exterior hot temperatures for buildings. Through this study, it was demonstrated that PU-PCM composite insulation could potentially help building energy savings through reducing the loads on the HVAC systems based on the building energy modeling using EnergyPlus. The Zero Energy Lab (ZØE) at the University of North Texas was modeled and studied in the EnergyPlus. It is a detached building with all wall facades exposed to the ambient. It was determined that the new PU-PCM insulation material could provide 14% total energy saving per year and reduce the electricity use due to cooling only by around 30%.
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42

Mohiuddin, Mohammed Salman. "Membrane-Based Energy Recovery Ventilator Coupled with Thermal Energy Storage Using Phase Change Material for Efficient Building Energy Savings." Thesis, University of North Texas, 2018. https://digital.library.unt.edu/ark:/67531/metadc1404519/.

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This research work is focused on a conceptual combination of membrane-based energy recovery ventilator (ERV) and phase change material (PCM) to provide energy savings in building heating, ventilation & air-conditioning (HVAC) systems. An ERV can recover thermal energy and moisture between the outside fresh air (OFA) entering into the building and the exhaust air (EA) leaving from the building thus reducing the energy consumption of the HVAC system for cooling and heating the spaces inside the building. The membranes were stacked parallel to each other forming adjacent channels in a counter-flow arrangement for OFA and EA streams. Heat and moisture is diffused through the membrane core. Flat-plate encapsulated PCM is arranged in OFA duct upstream/downstream of the ERV thereby allowing for further reduction in temperature by virtue of free cooling. Paraffin-based PCMs with a melting point of 24°C and 31°C is used in two different configurations where the PCM is added either before or after the ERV. Computational fluid dynamics (CFD), and heat and mass transfer modeling is employed using COMSOL Multiphysics v5.3 to perform the heat and mass transfer analysis for the membrane-based ERV and flat-plate PCMs. An 8-story office building was considered to perform building energy simulation using eQUEST v3.65 from Department of Energy (DOE). Based on the heat and mass transfer analysis, it is found that the sensible effectiveness (heat recovery) stood in the range of 65%-97% while the latent effectiveness (moisture recovery) stood at 55%-80%. Also, the highest annual energy savings achieved were 72,700 kWh in electricity consumption and 358.45 MBtu in gas consumption.
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43

Besch, Théo. "Implementation of a tool for equipment supply planning : Creation and implementation of an Excel tool to improve the efficiency of the planning of supply for equipment in the structural work phase of apartment buildings projects." Thesis, KTH, Byggteknik och design, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-291736.

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Supply planning is one of the key steps in an apartment building constructionproject, due to the repetitive nature of these projects where the constructionpace therefore has a crucial importance. However, if the working forceplanning and the materials planning are often acknowledged as important,the equipment supply planning can happen to be considered as secondary.Therefore less effort has been put in the tools used to make this planning.This master thesis is the result of a work in collaboration with the methodsdepartment at Eiffage Construction Habitat, one of the most important Frenchconstruction companies. It presents the implementation of a tool that automatesan important part of the equipment supply planning in order to gain efficiencyduring this planning process and to be able to focus deeper on the keyissues of the project. This tool allows to drastically reduce the time spentduring the supply planning for the equipment of the structural phase, bothregarding vertical works (walls and columns) and horizontal works (floors,beams and balconies). Along with making the planning more efficient, itallows to standardize the output documents and facilitate the work of theother departments with whom the methods department collaborates. Resultingfrom a case study and an internal survey, the implemented tool relies onthe Microsoft Visual Basic for Applications technology, allowing to staywithin the users’ range of mastered software, therefore improving the adoptionpotential of the tool. The results analysis showed a great satisfaction from theusers, both regarding the abilities of the tool and its form.
Resursplaneringen är ett av de viktigaste stegen i ett projekt för byggandeav flerbostadshus på grund av den repetitiva karaktären hos dessa projektdär bygghastigheten därför har en avgörande betydelse. Men om arbetskraftsplaneringenoch materialplaneringen ofta ses som viktiga kan planeringenav utrustningsförsörjningen råka betraktas som sekundär. Därför har mindreansträngningar lagts på de verktyg som används för att göra denna planering.Detta examensarbete är resultatet av ett arbete i samarbete med metodavdelningenvid Eiffage Construction Habitat, ett av de viktigaste franska byggföretagen.Arbetet presenterar implementeringen av ett verktyg som automatiseraren viktig del av planeringen av utrustningsförsörjningen för att få effektivitetunder denna planeringsprocess och för att kunna fokusera djupare på deviktigaste frågorna i projektet. Detta verktyg gör det möjligt att drastisktminska den tid som spenderas under leveransplaneringen för konstruktionsfasensutrustning, både när det gäller vertikala arbeten (väggar och pelare)och horisontella arbeten (golv, balkar och balkonger). Tillsammans med atteffektivisera planeringen möjliggör det att standardisera utdata och underlättaarbetet för de andra avdelningar som metodavdelningen samarbetar med.Till följd av ett studiefall och en intern undersökning är det implementeradeverktyget beroende av Microsoft Visual Basic for Applications-tekniken,vilket gör det möjligt att hålla sig till denprogramvara som användarnashar tillgång till och kan behärska, , vilket förbättrar möjligheter för attverktyget ska accepteras och använda verktyget. Resultatanalysen visade enstor tillfredsställelse från användarna, både vad gäller kan leverera och hurgränssnittet till användaren är utformat.
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Ortega, Del Rosario Maria de los Ángeles. "Système de stockage et transfert d'énergie par chaleur latente adaptable au rafraîchissement d’air en bâtiments : conception et analyse thermique." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0197/document.

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Ces travaux de thèse visent à concevoir et étudier une unité d'échangeur de chaleur air-MCP en tant que solution passive a la problématique du contrôle de confort thermique dans les bâtiments pendant l'été, fournissant des directives de conception et une intégration facile aux bâtiments. Les MCP présentent une grande capacité de stockage par unité de volume, ce qui leur permet de contribuer à la réduction de la consommation d'énergie liée aux applications de rafraîchissement. Bien qu'ils présentent certains inconvénients, en tant que faible conductivité thermique, notamment dans les PCM commerciaux, une conception bien détaillée est nécessaire pour atteindre des performances thermiques adéquates.La première partie de cette thèse examine les systèmes existants à travers une étude bibliographique, mettant en évidence la relation géométrique avec la physique et la performance thermique. Cette recherche a fourni les bases pour le développement d'une conception d'une unité air-MCP, suivant une méthodologie de résolution de problèmes développée par le laboratoire I2M. Une matrice de mots-clés a été obtenue à partir des phénomènes physiques et de l'analyse fonctionnelle de l'unité. A partir de cette matrice, l'analyse des brevets a inspiré la conception qui a abouti à un échangeur de chaleur air-PCM à faisceau tubulaire avec des tubes verticaux alignés perpendiculairement au flux d'air.Le développement d'outils de conception et d'intégration dans les bâtiments a été recherché au moyen d'une modélisation permettant de prédire avec précision les performances thermiques du système. Les modèles simplifiés sont préférés pour cette tâche. Néanmoins, ils peuvent sous-estimer les performances réelles si les phénomènes physiques impliqués ne sont pas correctement comptabilisés. Alors,des approches expérimentales locales et globales ont été utilisées pour parvenir à une compréhension de la physique associée aux cycles de charge et de décharge dans l'unité air-MCP. Pour cela, un banc d'essai a été installé, mesurant la température et le débit d'air dans différentes conditions d'entrée, accompagné d'un suivi visuel à travers des images numériques. Les traitements d'images et des données ont été utilisés pour obtenir des indicateurs de performance thermique et des corrélations équivalentes en utilisant des nombres adimensionnels connus pour les mécanismes de transfert de chaleur convectifs-conducteurs dans le PCM.Ces découvertes ont permis de développer des modèles de résistance thermique et d'enthalpie qui rendent compte de la complexité des phénomènes impliqués dans l'unité pour la prédiction de la performance. Enfin, la performance thermique du système a été testée dans deux applications de bâtiments : en tant qu'unité mobile dans une maison PEH à Gradignan dans un bureau du labo I2M
The present work aims to design and study an air-PCM heat exchanger unit as a passive solution for thermal comfort assessment in buildings during summertime, providing tools to ease the design and building integration. The PCM present a large storage capacity per volume unit where by, they can contribute to the reduction of the energy consumption related to cooling applications. Although, theyshow some drawbacks, as a low thermal conductivity in commercial PCM, so a wellthought design of these kind of systems is necessary to achieve adequate thermal performances.The first part of this thesis surveys the existing systems through a literature review,highlighting the geometry relation with the physics and thermal performance. This search provided the bases for the development of an air-PCM unit design, following a problem-solving methodology developed by the I2M laboratory. A keyword matrix was obtained from the physical phenomena and functional analysis of the unit. From this matrix, the patents analysis provided inspiration for the design resulting in a tubebundle air-PCM heat exchanger with vertical tubes aligned perpendicular to the airflow.The development of design and integration in buildings tools was sought through a modeling that can accurately predict the thermal performance of the system.Simplified models are preferred for this task. Nevertheless, they can under predict the actual performance if the physical phenomena involved is not properly accounted. Then, local and global experimental approaches were used to achieve anunderstanding of the physics associated with charging and discharging cycles in theunit. For this, a test bench was installed, measuring temperature and airflow underdifferent in let conditions, accompanied by a visual tracking through digital images.Image and data processing were used to obtain thermal performance indicators and equivalent correlations using known dimensionless numbers for convective conductive heat transfer mechanisms in the PCM.These findings allowed the development of thermal models based on energy balances, that accounted the complexity of phenomena involved in the unit for performance prediction. Finally, the thermal performance of the system was tested intwo buildings applications: as a mobile unit in a PEH house in Gradignan and as anactive façade in a building in Talence
El presente trabajo tiene como objetivo diseñar y estudiar una unidad intercambiador de calor aire-PCM como presentan una solución pasiva al conforttérmico en edificios durante el verano, proporcionando herramientas para facilitar el diseño y la integración en edificios. Los PCM una gran capacidad de almacenamiento por unidad de volumen, por lo que pueden contribuir a la reducción del consumo de energía relacionado con las aplicaciones de refrigeración. Estos materiales presentan algunos inconvenientes en cual su uso, como una baja conductividad térmica, típica en PCM comerciales, por lo es necesario un diseño que tome en cuenta esta problemática para lograr rendimientos térmicos adecuados. La primera parte de esta tesis examina los sistemas existentes a través de unarevisión de la literatura, destacando la relación de geometría con los fenómenos físicos y el rendimiento térmico. Esta búsqueda proporcionó las bases para el desarrollo de un diseño de unidad aire-PCM, siguiendo una metodología de resolución de problemas desarrollada por el laboratorio I2M. Se obtuvo una matrizde palabras clave a partir de los fenómenos físicos y el análisis funcional de launidad. A partir de esta matriz, el análisis de patentes proporcionó inspiración para el diseño que dio como resultado un intercambiador de calor PCM de aire y haz detubos verticales alineados perpendicularmente al flujo de aire.El desarrollo del diseño y la integración en herramientas de edificios se buscó através de un modelo que pudiese predecir con precisión el rendimiento térmico delsistema. Los modelos simplificados son los preferidos para esta tarea. Sin embargo,su poder de predicción puede verse afectada si los fenómenos físicos involucradosno se contabilizan adecuadamente. Es por ello que se utilizaron enfoques experimentales locales y globales para lograr una comprensión de la física asociadacon los ciclos de carga y descarga en la unidad. Se realizó una instalación de unbanco de pruebas, que permitió mediciones de temperatura y flujo de aire en diferentes condiciones de entrada, acompañado de un seguimiento visual a travésde imágenes digitales. El procesamiento de imágenes y datos se utilizó para obtener indicadores de rendimiento térmico y correlaciones a partir de números adimensionales relacionados con mecanismos de transferencia de calor porconvección y conducción en el PCM.Estos hallazgos permitieron el desarrollo de modelos térmicos para la predicción delrendimiento, basados en balances de energía de cada volumen de control.Finalmente, el rendimiento térmico del sistema se probó en dos aplicaciones deedificios: como una unidad móvil en una casa PEH en Gradignan y dentro de una oficina del laboratorio I2M
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45

Achard, Patrick. "Etude et caractérisation de parois d'enveloppe de bâtiment intégrant un matériau à changement de phase et constituant une interface modulable permettant la captation de l'énergie solaire et la gestion des ambiances intérieures." ENMP, 1986. http://www.theses.fr/1986ENMP0016.

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Analyse de l'évolution des materiaux et des techniques ainsi que des consequences induites par celles-ci sur la conception du bati. Importance du concept de masse (ou inertie) quant a son influence sur le comportement thermique du batiment vis a vis du rayonnement solaire. Etat des connaissances sur les materiaux presentant un changement de phase, utilisables dans les parois du batiment. Modelisation physique, experimentation sur modeles reduits et a l'echelle 1; methodes numeriques de traitement du signal
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46

Basecq, Vincent. "Développement d’un mur capteur-stockeur solaire pour le chauffage des bâtiments à très basse consommation d’énergie." Thesis, La Rochelle, 2015. http://www.theses.fr/2015LAROS013/document.

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L’exploitation des énergies renouvelables est une voie nécessaire afin de lutter contre le réchauffement climatique, et afin d’anticiper la raréfaction des matières premières. Le mur capteur/stockeur solaire appliqué aux bâtiments à très basses consommations d’énergie s’inscrit dans cette volonté d’une transition vers les énergies renouvelables. Dans le cadre de ces travaux de thèse, l’énergie solaire est stockée dans des matériaux à changement de phase qui permettent un stockage de chaleur latente plus dense que le stockage sensible des matériaux de construction traditionnels. Cette énergie est restituée à l’ambiance intérieure par la circulation d’air neuf à travers l’élément de stockage. Un mur capteur/stockeur solaire a été développé en s’appuyant sur une revue bibliographique préalable des différents travaux scientifiques menés pour des problématiques similaires. Le dispositif a été expérimenté en environnement réel dans un premier temps, intégré à l’enveloppe d’un petit bâtiment en bois fortement isolé. La quantité de chaleur captée par le mur peut atteindre 2 kWh.m-2.jour-1, pour une quantité de chaleur restituée à l’air de 1,5 kWh.jour-1. Le dispositif a été testé en conditions maîtrisées de laboratoire. Une attention particulière a été portée à la mesure de température au sein même du MCP, afin d’analyser le comportement thermique de ce dernier. Deux phénomènes ont été observés : le recouvrement de la phase liquide sur la phase solide et l’homogénéisation des températures en phase liquide. Le comportement thermique du MCP dépend des interactions entre trois flux : le flux de charge (apport solaire), le flux de décharge (énergie restituée à l’air) et un flux vertical induit par le recouvrement de la phase liquide sur la phase solide. Par ailleurs, un modèle numérique dynamique du mur capteur a été développé en volumes finis. Ce modèle permet de simuler l’effet de serre du mur capteur, le stockage de chaleur et les phases de solidification et de fusion du MCP, et la restitution de chaleur à l’air entrant dans le bâtiment. Les résultats numériques alors obtenus ont été confrontés aux données expérimentales. Le modèle a été validé pour la température d’air soufflée (en sortie du mur capteur). L’écart entre valeurs expérimentales, sur des périodes journalières, est en moyenne de 0,6°C pour la température d’air soufflé et est inférieur à 10 % pour l’énergie fournie à l’air préchauffé. Ces différences sont inférieures aux incertitudes de mesures et à l’incertitude du calcul énergétique. Le modèle ainsi validé peut être couplé au code de simulation thermique dynamique du bâtiment TRNSYS
Use of renewable energy is a necessary way to fight global warming and to anticipate scarcity of raw materials. The solar/storage wall used in buildings with lower energy consumption meets this evolution to renewable energy sources. In this thesis, solar energy is stored in a phase charge material (PCM), which provides latent storage. The latent storage is higher than sensible storage in usual building materials. This energy is restored to indoor air, by circulation and heating of inlet air through the wall storage element. In this thesis work, the solar storage wall was developed, based on previous published works dealing with similar systems. An experiment has been carried out with the solar storage integrated in a small wood building with a high insulation. The solar energy recovered by the wall reaches 2 kWh.m-2.day-1 and 1,5 kWh.day-1 was restored to air. In a second experiment, a prototype was developed to be used in controlled laboratory conditions. Special attention was given to PCM temperature measures to analyze the PCM thermal behavior. Two phenomena were observed: (i) liquid phase recovering solid phase, (ii) temperature homogenization in liquid phase. The PCM thermal behavior depends on interactions between three energetic flows: the charge flow (solar energy recovered), the restored flow (energy restored to the inlet air) and a vertical flow created by the liquid phase recovering. Furthermore, a numerical dynamic model for the solar storage wall was developed. It is based on a finite volume approach. This model simulates: (i) the ground effect in a solar wall, (ii) the thermal energy storage and phase changes, and (iii) heat recovery energy to air inlet. Numerical results were compared to experimental values. The model was validated for air temperature for daily cycle defined with a charge period (during sunning) and a continue air heating. The difference between numerical values and experimental values are lower than 0.6°C in mean temperature, and 10% in energy. This difference is lower than measurement uncertainties and energy calculation error margins. So the model is valeted and can be coupled with the dynamic thermal simulation code: TRNSYS
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47

Brun, Adrien. "Amélioration du confort d'été dans des bâtiments à ossature par ventilation de l'enveloppe et stockage thermique." Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00652449.

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Depuis quelques années, d'importants efforts ont été réalisés sur l'amélioration de la performance énergétique des bâtiments qui représentent le premier poste de consommation énergétique en France. Les exigences de la nouvelle réglementation thermique 2012 illustrent bien ces évolutions avec une consommation conventionnelle d'énergie primaire comprenant l'ensemble des postes (chauffage, climatisation, éclairage, ventilation, eau chaude sanitaire), déduction faite de l'électricité produite sur place, qui devra être inférieure à 50 kWh.m2.an-1 d'énergie primaire. La réponse à cette nouvelle exigence se fera par l'adoption de technologies constructives conduisant à une consommation pour le chauffage équivalente aux constructions dites " passives " (environ 15 kWh.m2.an-1) et dont le recours à la climatisation est limité voir inexistant. Il s'agit pour cela de limiter toutes les contributions à l'échauffement du bâtiment et éventuellement de lui adjoindre un système de rafraichissement à coefficient de performance élevé. Après avoir montré par l'exemple qu'un bâtiment à ossature à faible inertie en métropole, par sa capacité de stockage thermique limitée, est prédisposé à des problèmes de surchauffe, nous avons construit cette thèse autour de deux axes d'amélioration, dédiés aux constructions à ossature, que sont : - La limitation des charges solaires transmises au travers de l'enveloppe en faisant appel à une spécificité des constructions à ossature qu'est la présence d'un espace naturellement ventilé en sous-face du parement extérieur que nous utiliserons afin d'extraire une partie des charges solaires incidentes; - Le couplage de ces bâtiments " légers " à un échangeur air/masse qui contient l'inertie nécessaire au maintien des conditions de confort estivales lorsque la réduction de température nocturne le permet. Basée sur une approche numérique et expérimentale en vrai grandeur et en conditions réelles, nous proposons d'aborder tour à tour chacune de ces stratégies d'amélioration du confort qui trouvent leurs applications aussi bien en climat chaud et sec qu'en climat tropical.
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48

Nizamoglu, Ezgi. "DESIGN APPROACHES FOR CONSTRUCTION AND DEMOLITION WASTE MINIMIZATION GENERATED THROUGH THE BUILDING LIFE PROCESSES AND A MODEL SUGGESTION." Doctoral thesis, 2022. http://hdl.handle.net/2158/1277839.

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Reducing waste generation is the most effective method for stopping the depletion of natural resources and is an essential factor in environmental conservation and the sustainable use of natural resources. The greatest responsibility in reducing construction and demolition waste belongs to designers, who make decisions directly in the design of the building and directly and indirectly in the construction, usage, and demolition phases. This study examines the ways that construction and demolition waste can be reduced in the design phase, develops a design approach, and proposes solutions.
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49

Wang, Ssu Chih, and 王思之. "Analysis and Experiments on Structural Stability in Explosion Demolition of Single-story Single-bay Buildings." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/51554151333884499593.

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碩士
國立成功大學
建築(工程)學系
86
ABSTRACT The purposes of this research emphasize on the behavior of explosion demolition structures, and try to find a simple model to explain the failure behavior of explosion demolition structure. The failure behavior discussed includes collapse-direction, collapse-range and collapse-altitude. Research works are divided into two parts. One is theoretical analysis and the other is experiments. The contents includes collapse-direction of single-story single- bay buildings, collapse-range of single-story single-bay buildings, collapse-height of single-story single-bay buildings, reasonable explosion gap, the weight needed to collapse completely, and potential energy needed to collapse. Experiments are carried out for possible failure forms of single-story single-bay buildings and the bearing weight ability of explosion demolition of single-story single-bay buildings. The first part of the experiments is to discuss the problems may be met in all kinds of failure forms. The second part of the experiments is to discuss the weight of the structure needed to have a complete collapse. Keywords ： explosion demolition、failure forms、 explosion gap、 Strength-center、mass-center
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Wang, Si-Zhi, and 王思之. "Analysis and experiments on structural stability in explosion demolition of single-story single-ba y buildings." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/87556835318848254506.

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