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1
Fang, Zhicheng, Wanjiang Wang, Yanhui Chen, and Junkang Song. "Structural and Heat Transfer Model Analysis of Wall-Mounted Solar Chimney Inlets and Outlets in Single-Story Buildings." Buildings 12, no. 11 (October 26, 2022): 1790. http://dx.doi.org/10.3390/buildings12111790.
Повний текст джерелаАнотація:
Wall-mounted solar chimneys use solar radiation to heat the air inside the chimney cavity and use thermal pressure to create natural convection. Applying this principle allows for the indoor ventilation of a building without energy consumption. However, in wall-mounted solar chimney designs, different air inlet and outlet design dimensions can have varying degrees of impact on the effectiveness of wall-mounted solar chimney ventilation. In order to analyze the internal airflow state and airflow temperature field distribution of wall-mounted solar chimneys, physical models of wall-mounted solar chimneys with six different air outlet-to-inlet cross-sectional area ratios were developed in this research work. Before numerical simulation analysis, heat transfer analysis of the wall-mounted solar chimney’s structural components and airflow channels was carried out, and corresponding mathematical heat transfer models were established. The internal flow state and temperature distribution characteristics of a wall-mounted solar chimney were analyzed by steady-state simulations using the computational fluid dynamics software, Ansys Fluent. Finally, transient simulation calculation analysis was conducted under six different S-value models to investigate the variation in the natural ventilation of a single-story building’s wall-mounted solar chimney for a whole day. The study showed that under the same simulation conditions, 80% ≤ S < 100% effectively avoided the formation of vortices in the internal airflow of the wall-mounted solar chimneys and kept the ventilation effect of wall-mounted solar chimneys at a high level. The results of this study provide a reference for the optimization of research on the design of the air inlet and outlet structures of wall-mounted solar chimneys for single-story buildings.
2
Harte, Reinhard, Martin Graffmann, and Wilfried B. Krätzig. "Optimization of Solar Updraft Chimneys by Nonlinear Response Analysis." Applied Mechanics and Materials 283 (January 2013): 25–34. http://dx.doi.org/10.4028/www.scientific.net/amm.283.25.
Повний текст джерелаАнотація:
Solar updraft chimneys (SUCs) form as engines of solar updraft power plants tower-like shell structures of extreme height with rather thin shell walls, similar to high chimneys comprising multiple flue gas ducts. The height of pre-designed SUCs presently reaches up to 1000 m. Thus they are exposed chiefly to extreme wind-loads and thermal actions from the internal flow of warm air. As first design attempt, the structural analysis of solar chimneys generally is carried out by linear elastic models. For optimization, the typical shell-like wind stresses have to be constraint towards a more beam-like response behavior, approaching as far as possible linear stresses over the entire chimney circumference. This requires rather strong ring stiffeners, either as spoke-wheels in the designs of sbp (Schlaich Bergermann and Partners) or as external stiffeners in the designs of K&P (Krätzig and Partners). Both alternatives require considerable construction efforts leading to high investment costs. There exists an interesting simplification of this stiffening, namely applying to the SUC shell relatively soft external rings, and admitting large-widths cracking in the limit state of failure. This cracking constraints and equalizes the meridional stresses over the chimney’s cross-section, saving large amounts of reinforcement steel in the SUC. The design requires materially nonlinear analyses to verify the internal forces under crack-formations. The manuscript will derive this concept and demonstrate the crack analysis by example of a 750 m high solar chimney.
3
Liu, Hong Bin, and Meng Li. "Heightening Design and Construction of the Reinforcement Concrete Chimney in Heated State." Advanced Materials Research 243-249 (May 2011): 5610–13. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.5610.
Повний текст джерелаАнотація:
This paper introduced a project of reinforced concrete chimney with a height of 90 meters, which does not stop construction at nearly 200 degree Celsius, increased the height of the chimney with 10 meters. Reasonable structural measures were promoted to ensure the normal pouring of concrete chimneys. Compared with the normal condition, this measure is economical, low investment, feasible, etc. It provides far-reaching significance that increasing the height of the reinforced concrete chimney at the high temperature state.
4
Ekechukwu, O. V., and B. Norton. "Design and Measured Performance of a Solar Chimney for Natural Circulation Solar Energy Dryers." Journal of Solar Energy Engineering 118, no. 1 (February 1, 1996): 69–71. http://dx.doi.org/10.1115/1.2847956.
Повний текст джерелаАнотація:
An experimental solar chimney consisted of a cylindrical polyethylene-clad vertical chamber supported by steel framework and draped internally with a selectively absorbing surface. The performance of the chimney which was monitored extensively is reported. Issues related to the design and construction of solar chimneys for natural circulation solar energy dryers are discussed.
5
Nguyen, Y. Quoc, Viet T. Nguyen, Long T. Tran, and John C. Wells. "CFD Analysis of Different Ventilation Strategies for a Room with a Heated Wall." Buildings 12, no. 9 (August 25, 2022): 1300. http://dx.doi.org/10.3390/buildings12091300.
Повний текст джерелаАнотація:
Solar chimneys can help to reduce solar heat gain on a building envelope and to enhance natural ventilation. In this work, we proposed three configurations of two solar chimneys combined with a heated wall for the natural ventilation of a room: (I) the chimneys are connected serially, (II) the chimneys are parallel and exhaust air at two separate outlets, and (III) the chimneys are parallel, but the outlets are combined. The airflow rate achieved with each configuration was predicted with a Computational Fluid Dynamics model. The results show the effects of the heat flux in each channel and the geometries of the channels. Configuration (II) shows the highest flow rate. Particularly, the proposed configurations enhance the flow rate significantly and up to 40% when compared to the typical setup with a single channel solar chimney. The findings offer a novel design option for building façades for reducing solar heat gain and enhancing natural ventilation.
6
Abaev, Z. K., M. Yu Kodzaev, and A. D. Valiev. "ASSESSMENT OF THE SEISMIC RESISTANCE DEFICIT OF BRICK MASONRY CHIMNEY ACCORDING TO RELEVANT DESIGN CODES." Construction and industrial safety, no. 19 (71) (2020): 13–25. http://dx.doi.org/10.37279/2413-1873-2020-19-13-25.
Повний текст джерелаАнотація:
Most of the brick masonry chimneys located in earthquake-prone areas were built long before the current design codes were adopted, which poses a great threat to the sustainable operation and development of the city industry as a whole. This article presents a consistent example of assessing the deficit of earthquake resistance of a brick masonry chimney and gives general conclusions about changes in main coefficients of designed codes. This study aims to quantify the deficit of earthquake resistance of brick masonry chimney according to the relevant Building Codes “SP 14.13330.2018 Construction in seismic areas”.
7
Lišková, Zuzana, and Juraj Olbřímek. "Comparison of Requirements in Slovak and Selected Foreign Legislation on the Issue of Safe Distance of the Wooden Building Structures from the Flue." Applied Mechanics and Materials 820 (January 2016): 396–401. http://dx.doi.org/10.4028/www.scientific.net/amm.820.396.
Повний текст джерелаАнотація:
The paper deals with the solution of interconnections of flue and combustible construction products in the fire safety design. It is focused mainly on a prescribed value of safe distance of the wooden building construction from a single-walled metal chimneys. The aim of article is to point out the necessity to solve the contradictory requirements in the Slovak legislation and inconsistency with the foreign regulations in terms of fire rates caused by chimneys and flues.
8
Bhatt, Megha, and Sandip A. Vasanwala. "Scaling of RC Chimney for the Experimental Investigation under Lateral Load." International Journal of Innovative Technology and Exploring Engineering 11, no. 2 (December 30, 2021): 43–51. http://dx.doi.org/10.35940/ijitee.b9652.1211221.
Повний текст джерелаАнотація:
Reinforced concrete chimneys are tall industrial structures specially used in power plants to expel waste gases at high enough elevation. Based on the study of various literature available for the subject, various geometrical, material, and loading parameters to be followed to prepare the test specimens are presented in this paper so that the test specimen represents the behaviour of the actual RC chimney. The special construction process required to be followed is described in this paper along with the various analytical checks to be performed before the actual application of lateral loads on test specimens. Different design standards give different design recommendations mainly in terms of the stress-strain curve of concrete and steel. So, various experimental tests performed by applying the lateral load on specially designed and casted test specimens which represents the actual chimney in the field helps the researchers to compare the various design standards and helps the industry to opt for the same.
9
Leng, Pau Chung, Siew Bee Aw, Nor Eeda Haji Ali, Gabriel Hoh Teck Ling, Yoke Lai Lee, and Mohd Hamdan Ahmad. "Solar Chimneys as an Effective Ventilation Strategy in Multi-Storey Public Housing in the Post-COVID-19 Era." Buildings 12, no. 6 (June 13, 2022): 820. http://dx.doi.org/10.3390/buildings12060820.
Повний текст джерелаАнотація:
This paper studies the effectiveness of a solar chimney for improving ventilation and air-exchange rates in multi-storey public housing in tropical climates for the potential mitigation of airborne disease transmission. Virtual models of a typical apartment room with natural cross-ventilation, replicated across four levels to mimic a multi-storey block, were set up with six internal wind velocity sensor points per floor. The simulation software Energy2D was then used to evaluate the performance of the models, first testing the presence of a solar chimney, and then additionally the degree to which the solar chimney model was affected by a complementary ceiling fan. Wind velocity was also measured, as this is a variable that affects ACH rates. Using a non-parametric Wilcoxon signed-rank test, the introduction of a solar chimney was found to have a significant impact on air-flow rates (a variable that positively affects air-exchange rates), resulting in a p-value of 0.000 and Z-value of −3.920. Regression analysis determined that the solar chimney’s effect was enhanced when complemented by a ceiling fan (R-squared value of 0.4687). Consequently, we propose several design strategies that may enable the adoption of the solar chimney concept to improve natural ventilation in residential units.
10
Harte, Reinhard, Markus Tschersich, Rüdiger Höffer, and Tarek Mekhail. "DESIGN AND CONSTRUCTION OF A PROTOTYPE SOLAR UPDRAFT CHIMNEY IN ASWAN/EGYPT." Acta Polytechnica 57, no. 3 (June 30, 2017): 167–81. http://dx.doi.org/10.14311/ap.2017.57.0167.
Повний текст джерелаАнотація:
This work is part of a joint project funded by the Science and Technology Development Fund (STDF) of the Arab republic of Egypt and the Federal Ministry of Education and Research (BMBF) of the Federal Republic of Germany. Continuation of the use of fossil fuels in electricity production systems causes many problems such as: global warming, other environmental concerns, the depletion of fossil fuels reserves and continuing rise in the price of fuels. One of the most promising paths to solve the energy crisis is utilizing the renewable energy resources. In Egypt, high insolation and more than 90 percent available desert lands are two main factors that encourage the full development of solar power plants for thermal and electrical energy production. With an average temperature of about 40 °C for more than half of the year and average annual sunshine of about 3200 hours, which is close to the theoretical maximum annual sunshine hours, Aswan is one of the hottest and sunniest cities in the world. This climatic condition makes the city an ideal place for implementing solar energy harvesting projects from solar updraft tower. Therefore, a Solar Chimney Power Plant (SCPP) is being installed at Aswan City. The chimney height is 20.0 m, its diameter is 1.0m and the collector is a four-sided pyramid, which has a side length of 28.5 m. A mathematical model is used to predict its performance. The model shows that the plant can produce a maximum theoretical power of 2 kW. Moreover, a CFD code is used to analyse the temperature and velocity distribution inside the collector, turbine and chimney at different operating conditions. Static calculations, including dead weight and wind forces on the solar updraft chimney and its solar collector, have been performed for the prototype. Mechanical loading and ambient impact on highly used industrial structures such as chimneys and masts cause lifetime-related deteriorations. Structural degradations occur not only from rare extreme loading events, but often as a result of the ensemble of load effects during the life-time of the structure. A Structural Health Monitoring (SHM), framework for continuous monitoring, is implemented on the solar tower. For the ongoing case study, the types of impacts, the development of the strategic sensor positioning concept, examples of the initially obtained results and further prospects are discussed. Additional wind tunnel tests have been performed to investigate the flow situation underneath the solar collector and inside the transition section. The flow situation in and around the SCPP has been simulated by a combination of the wind tunnel flow and a second flow inside the solar tower. Different wind tunnel velocities and volume flow rates have been measured respectively. Particle Image Velocimetry (PIV) measurements give some indication of the flow situation on the in- and outside of the solar tower and underneath the collector roof. Numerical simulations have been performed with the ANSYS Fluent to validate the experimental tests.
11
Slobodchikov, E. "RESEARCH OF THE OPERATION OF LOW-POWER SOLID-FUEL HEAT GENERATORS UNDER THE CLIMATIC CONDITIONS OF THE NORTH." Bulletin of Belgorod State Technological University named after. V. G. Shukhov 7, no. 10 (June 10, 2022): 49–58. http://dx.doi.org/10.34031/2071-7318-2022-7-10-49-58.
Повний текст джерелаАнотація:
The growth trend of individual housing construction in the country decides the socio-economic role in solving the housing issue of the population. The development of housing construction in Yakutia is characterized by ensuring the pace of construction and various social programs in rural areas. Due to geographic and transport and logistics difficulties, connecting many settlements and microdistricts to centralized power supply sources is difficult and incurs large budget costs. On the market there are various solid fuel heat generators of low power (up to 100 kW) with an upper fuel ignition method, using coal and wood fuel. Practice shows that these heat generators and their chimney systems experience difficulties when operating at low outdoor temperatures, which is reflected in the formation of soot on heating surfaces and acid condensate in chimneys. One of the reasons is the unsatisfactory mode of fuel combustion due to the design features of the boiler furnace. To study the influence of climatic and external factors on the operation of a solid fuel heat generator, during the heating period, measurements were made of the operation parameters of the boiler furnace and its chimney system. It has been established that with a decrease in the volume of fuel as it burns out in the furnace, the combustion temperature and heat output are significantly reduced, which is associated with an increase in the excess air coefficient.
12
Dadaso Desai,, Aditya, Vishnu Dnyaneshwar Biradar, and Dr Prof D. B. Desai. "SLIP FORMWORK." International Journal of Engineering Applied Sciences and Technology 7, no. 2 (June 1, 2022): 158–60. http://dx.doi.org/10.33564/ijeast.2022.v07i02.022.
Повний текст джерелаАнотація:
Slip forming is one of the most effective processes for constructing unconventional structures such as cooling towers, chimneys, and silos, as well as roadway and bridge construction. Formwork made using slips techniques used on a construction with a height of more than 16 meters and its unique design. Techniques for erection that are both quick and cost-effective. Slip forming takes into account. The fastest erection is 7.2 meters per day. procedure. They have a variety of components, and when they're finished, they're ready to use. It was elevated up and further by the hydraulic jack of curtain height concreting. It's possible to undertake some concreting. As a result, these methods are quick and efficient. Savings; cost-effective; and fewer workers are required.
13
Bajno, Dariusz, Łukasz Bednarz, and Agnieszka Grzybowska. "The Role and Place of Traditional Chimney System Solutions in Environmental Progress and in Reducing Energy Consumption." Energies 14, no. 16 (August 4, 2021): 4720. http://dx.doi.org/10.3390/en14164720.
Повний текст джерелаАнотація:
Buildings, energy, and the environment are key issues facing construction around the world. The energy efficiency of buildings is a key topic when it comes to reducing the world’s energy consumption, releasing harmful gases, and global climate change, as they consume about 40% of the world’s energy supplies. Heat losses in buildings reduce the energy performance of buildings and are basically important to them. In the paper, the authors focus on the main problems related to heat losses generated by chimney systems, which are inseparable equipment of building structures, resulting in lower energy efficiency and, at the same time, technical efficiency and durability of the building partitions themselves. Authors present thermal imaging with its contribution to the detection of heat losses, thermal bridges, insulation problems, and other performance disturbances, and then verifications using appropriate simulation models. The mathematical apparatus of artificial neural networks was implemented to predict the temperature distributions on the surfaces of prefabricated chimney solutions. In Europe, we can often find a large building substance equipped with traditional chimneys, which disrupts the current trend of striving to reduce energy consumption, especially that derived from fossil fuels. Speaking of energy-efficient buildings, one should not ignore those that, without additional security and modern installations, are constantly used in a very wide range. Therefore, the article deals with an essential problem that is not perceived in design studies and during the operation period as having a basis in incorrect architectural solutions and which can be easily eliminated. It concerns the cooling of internal partitions of buildings on their last storeys, in places where chimneys are located, regardless of their function. The authors of the paper decided to take a closer look at this phenomenon, which may allow the limiting of its effects and at the same time reduce its impact on the energy performance of technologically older buildings.
14
Krivoshapko, SN. "Static, vibration, and buckling analyses and applications to one-sheet hyperboloidal shells of revolution." Applied Mechanics Reviews 55, no. 3 (May 1, 2002): 241–70. http://dx.doi.org/10.1115/1.1470479.
Повний текст джерелаАнотація:
The principal achievements of science and engineering in the sphere of design, construction, and static, vibrational, and buckling analysis of thin-walled constructions and buildings in the shape of hyperbolic surfaces of revolution are summarized in this review article. These shells are useful as hyperbolic cooling towers, TV towers, reinforced concrete water tanks, and arch dams. They are also used as supports for electric power transmission lines and as high chimneys. Several public and industrial buildings having the hyperbolic form are described in the review. The basic results of theoretical and experimental investigations of stress-strain state, buckling, and vibration are summarized. The influence of temperature and moisture on the stress-strain state of the shells in question is also analyzed. This review article contains 261 references.
15
Mlčoch, Jan, and Miroslav Sýkora. "Determining Criteria for Assessment of RC Structures Affected by Carbonation-Induced Corrosion." Key Engineering Materials 868 (October 2020): 3–9. http://dx.doi.org/10.4028/www.scientific.net/kem.868.3.
Повний текст джерелаАнотація:
The construction industry is now facing expanding and extensive activities in the area of assessing and retrofitting buildings and bridges that aligns with the sustainable construction strategy. These activities recognise the importance of extending the life of existing construction works thereby delivering environmental, economic and socio-political benefits. Reinforced concrete structures and their reliability are currently receiving considerable attention as a significant part of these structures reaches the design service life. Degradation processes such as carbonation- and chloride-induced corrosion have a major influence on the reliability and serviceability of concrete structures. The submitted study is primarily focused on reinforced concrete structures whose main degradation factor is carbonation of the concrete cover. Examples of such structures are cooling towers or industrial chimneys. Structures in the power industry are usually designed for service life of 40 years. Carbonation-induced corrosion results in visible cracks and unacceptable spalling of concrete cover. The aim of the study is to improve predictions of carbonation-induced corrosion propagation and to critically compare the criteria for degradation level assessment used in practice. The probabilistic analysis is based on measurements of concrete cover and carbonation depths and continuous observations of signs of corrosion on structural surfaces. The example of an industrial chimney shows that the limit of a severe failure, which requires (possibly repeated) minor repairs, is exceeded after about 17 years. The critical failure limit (30% of structural surface with visible signs of corrosion) is reached after 50 years, which seems to be sufficient as it is after 10 years than the usual design service life.
16
Rotter, J. Michael. "Development of Proposed European Design Rules for Buckling of Axially Compressed Cylinders." Advances in Structural Engineering 1, no. 4 (October 1998): 273–86. http://dx.doi.org/10.1177/136943329800100404.
Повний текст джерелаАнотація:
Thin axially compressed cylinders are used in a wide range of civil engineering shell structures: towers, chimneys, tanks and silos. Design standards throughout in the world differ considerably in their strength predictions, and all are based on empirical lower bounds to laboratory test results. The chief reason for the scatter in strength assessments is the sensitivity to geometric imperfections, which naturally vary from one laboratory to another and according to the method of fabrication. This paper sets out some of the development behind the new proposed rules for the European standard on Strength and Stability of Shells. These rules cover cylinder buckling under axial compression alone, and the strength of internally pressurised cylinders. The design strengths are related to recent calculated buckling strengths, and an attempt is made to indicate the appropriate relationship between design assumed imperfections and tolerances during construction.
17
Bilčík, Juraj, Július Šoltész, Lýdia Leppakorpi Matiašková, and Katarína Gajdošová. "Causes of Failures in Circular Concrete Silo Walls, Particularly Under Environmental Influences." Slovak Journal of Civil Engineering 29, no. 4 (December 1, 2021): 1–8. http://dx.doi.org/10.2478/sjce-2021-0021.
Повний текст джерелаАнотація:
Abstract The paper reports the results of a case study for achieving longer service life and increasing the environmental sustainability of concrete silos. Damage mechanisms in concrete silo walls, and respectively in cylindrical structures (e.g., chimneys, cooling towers, and tanks), are widely diverse. The common causes of failures include those due to poor design considerations, construction deficiencies, non-compliance with operational rules and regulations, lack of maintenance, and insufficient and/or corroded reinforcements, together with the environmental conditions affecting the walls. In addition to the ultimate limit state design, temperature-induced cracking may often be underestimated in the design of reinforced concrete silos, leading to premature deterioration and losses in serviceability. Cracks from environmental or service conditions facilitate the ingress of moisture and corrosive agents. Therefore, there is an increased interest in reducing the appearance of cracks and limiting their width. The aim of this paper is to highlight the synergistic effects in the design, construction, and operation of silo walls, particularly under varying environmental influences. The research undertaken indicates that systematic errors can be identified and corrected.
18
Dutkiewicz, Maciej, Irena Gołębiowska, Ivan Shatskyi, Vasyl Shopa, and Andrii Velychkovych. "Some aspects of design and application of inertial dampers." MATEC Web of Conferences 178 (2018): 06010. http://dx.doi.org/10.1051/matecconf/201817806010.
Повний текст джерелаАнотація:
Over the last years, there has been intensive development of technologies applied to protect structures such as overhead transmission lines, chimneys, high rise buildings from excessive dynamic effects leading to their damage or destruction. In the paper special attention is put on the system of passive dampers applied to overhead transmission lines and dampers used in oil and gas industry. The efficiency of the aeolian damper is presented. The constructions of weighted drill pipes with vibration-impact particle dampers designed to absorb the energy of longitudinal and twisting oscillations of the drill tool are described. The advantage of a multi-container absorber is substantiated. The application aspects of the inertial dampers developed by the authors are combined using a common effect based on the antiresonance phenomenon.
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Arbianto, Reki, and Gunarso Gunarso. "Design Review of Leuwikeris DAM Acces Road Pakage 4." Pondasi 27, no. 1 (July 19, 2022): 98. http://dx.doi.org/10.30659/pondasi.v27i1.22881.
Повний текст джерелаАнотація:
Abstract: The construction of the Leuwikeris Dam requires materials to be used for stockpiling. Therefore, it is necessary to access the road from the quarry in question to the location of the dam. This access road is located in Cibodas Village RT 32 / RW 15 Ciharalang Village, Cijeungjing District, Ciamis Regency, West Java. The construction of access roads needs to build bridges connecting the valleys which requires making embankments to reach the elevation of the road plan. The embankment is made up to ± 15 m using embankment material around the site. This design review was carried out because a landslide occurred on one of the embankment slopes which did not rule out the possibility that it could occur on the opposite slope. This design review uses the help of the SLOPE/W program to determine the level of slope safety and alternative slope reinforcement designs. It should be noted that the data used are secondary data obtained from related parties. Some things that can be concluded from the design review are as follows: 1) The landslide occurred due to the failure of the existing gabion foundation to withstand the load of the slope. 2) Repair the gabion foundation by enlarging and deepening the dimensions (attached image), so that it can cut the landslide area. The dimensions of the large foundation are expected to provide sufficient counter weight. 3) The landslide material must be cleaned and start compaction per layer from the beginning. Ensure that the backfill is of maximum density. 4) Improved gabion design so as to obtain sufficient volume weight of at least 1.5 t/m3. The installation of bamboo chimneys is still being carried out as additional reinforcement. Keywords: Safety factor; Gabion; Road; Embankment; Slopes stability; Slope-W.
20
Laszlo, Robert, Ciprian Jitea, Bogdan Garaliu, Aurelian Nicola, and Levente Miklos. "Design and Execution of Demolition Works By Blasting of Industrial Constructions – Technical and Safety Aspects." Bulletin of the Polytechnic Institute of Iași. Machine constructions Section 68, no. 2 (June 1, 2022): 119–31. http://dx.doi.org/10.2478/bipcm-2022-0020.
Повний текст джерелаАнотація:
Abstract The paper describes the practical way and security conditions of realizing the demolition of an industrial chimney located in an oil refinery platform, having in the immediate vicinity sensitive equipment and constructions. The chimney has a height of 150 m and consists of the outer tubular structure of reinforced concrete and an inner chimney made of refractory brick masonry. In order to establish the possible secondary effects generated by the blasting works, a risk assessment was made with reference to seismic wave, air shock wave, noise, dust and the level of shock generated by the impact of chimney construction with the soil. The demolition work was carried out successfully and due to protection and safety measures no unwanted events were recorded, and the measured values of the seismic wave generated by the impact with the ground of the chimney were non-dangerous, being below the values estimated in the risk assessment.
21
Mabdeh, Shouib, Tamer Al Radaideh, and Montaser Hiyari. "ENHANCING THERMAL COMFORT OF RESIDENTIAL BUILDINGS THROUGH DUAL FUNCTIONAL PASSIVE SYSTEM (SOLAR-WALL)." Journal of Green Building 16, no. 1 (January 1, 2021): 139–61. http://dx.doi.org/10.3992/jgb.16.1.139.
Повний текст джерелаАнотація:
ABSTRACT Thermal comfort has a great effect on occupants’ productivity and general well-being. Since people spend 80–90% of their time indoors, developing the tools and methods that help in enhancing the thermal comfort for buildings are worth investigating. Previous studies have proved that using passive systems like Trombe walls and solar chimneys significantly enhanced thermal comfort in inside spaces despite that each system has a specific purpose within a specific climate condition. Hence, the main purpose of this study is to design and configure a new dual functional passive system, called a solar wall. The new system combines the Trombe wall and solar chimney, and it can cool or heat based on building needs. Simulation software, DesignBuilder, has been used to configure the Solar Wall and study its impact on indoor operative temperature for the base case. Using the new system, the simulation results were compared with those obtained in the base case and analyzed to determine the most efficient system design parameters and implementation method. The case that gave the best results for solar wall configuration was triple glazed glass and 0.1 cm copper as an absorber (case 11). The results show that using four units (case D) achieves longer thermal comfort levels: 15 to 24 thermal hours during winter (compared to five hours maximum) and 10 to 19 comfort hours in summer (compared to zero).
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Mabdeh, Shouib, Tamer Al Radaideh, and Montaser Hiyari. "ENHANCING THERMAL COMFORT OF RESIDENTIAL BUILDINGS THROUGH A DUAL FUNCTIONAL PASSIVE SYSTEM (SOLAR-WALL)." Journal of Green Building 16, no. 3 (June 1, 2021): 155–77. http://dx.doi.org/10.3992/jgb.16.3.155.
Повний текст джерелаАнотація:
ABSTRACT Thermal comfort has a great impact on occupants’ productivity and general well-being. Since people spend 80–90% of their time indoors, developing the tools and methods that enhance the thermal comfort for building are worth investigating. Previous studies have proved that using passive systems like Trombe walls and solar chimneys significantly enhanced thermal comfort in inside spaces despite that each system has a specific purpose within a specific climate condition. Hence, the main purpose of this study is to design and configure a new, dual functional passive system, called a solar wall. The new system combines the Trombe wall and solar chimney, and it can cool or heat based on building needs. Simulation software, DesignBuilder, has been used to configure the Solar Wall, and study its impact on indoor operative temperature for the base case. Using the new system, the simulation results were compared with those obtained in the base case and analyzed to determine the most efficient system design parameters and implementation method. The case that gave the best results for solar wall configuration was triple glazed glass and 0.1 cm copper as an absorber (case 11). The results show that using four units (case D) achieves longer thermal comfort levels: 15 to 24 thermal hours during winter (compared to five hours maximum) and 10 to 19 comfort hours in summer (compared to zero).
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Buchanan, Andrew H., and Michael P. Newcombe. "Performance of residential houses in the Darfield (Canterbury) earthquake." Bulletin of the New Zealand Society for Earthquake Engineering 43, no. 4 (December 31, 2010): 387–92. http://dx.doi.org/10.5459/bnzsee.43.4.387-392.
Повний текст джерелаАнотація:
This paper focuses on the observed seismic performance of residential houses (mainly single-storey and two-storey houses) in the Darfield earthquake on 4 September 2010 and identifies potential research areas for remediation and resilience.
Overall the residential building stock, consisting predominately of light timber frame construction, performed very well, with very little structural damage due to ground shaking. The most significant structural damage to houses was from differential settlement of foundations, induced by soil liquefaction and/or lateral spreading. Many older buildings (more than 20 years old) suffered damage due to falling chimneys. Close to the fault rupture, in areas such as West Melton and Rolleston, there was significant damage to building contents due to strong shaking, and a few broken windows. Away from the fault zone, very few windows were broken in any buildings, indicating limited inter-storey drift.
Research needs were identified associated mainly with the design and repair of houses on liquefaction-prone soils.
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Olabi, Abdul Ghani, Nabila Shehata, Hussein M. Maghrabie, Lobna A. Heikal, Mohammad Ali Abdelkareem, Shek Mohammod Atiqure Rahman, Sheikh Khaleduzzaman Shah, and Enas Taha Sayed. "Progress in Solar Thermal Systems and Their Role in Achieving the Sustainable Development Goals." Energies 15, no. 24 (December 14, 2022): 9501. http://dx.doi.org/10.3390/en15249501.
Повний текст джерелаАнотація:
The use of solar thermal systems (STSs) has recently reached a significant edge. The increasing research on developing an alternative power supply for limiting fossil fuel usage and climate change are the driving forces of STSs. The current work explores the recent progress in STSs’ applications, including PV/T or “photovoltaic/thermal” systems, zero-energy buildings, greenhouse solar thermal applications, solar thermal for pumping water, solar thermal refrigerators, solar chimneys, water desalination, and solar collectors, along with the benefits and challenges of these applications. Then, the potential contribution of STSs in achieving the various SDGs or “Sustainable development goals”, including barriers and research gaps, are elaborated. In brief, STSs significantly contribute to the seventeen SDGs’ achievement directly and indirectly. Recent developments in the engineering applications of STSs are strongly based on the materials of construction, as well as their design, process optimisation, and integration with multidisciplinary sciences and technologies such as modelling, nanoscience/nanotechnology, and artificial intelligence.
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Zhang, Yu Feng, and Chao Li. "Analysis of Collapsed Chimney of Balco Power Plant in India." Advanced Materials Research 250-253 (May 2011): 2229–33. http://dx.doi.org/10.4028/www.scientific.net/amr.250-253.2229.
Повний текст джерелаАнотація:
A large under-construction chimney at BALCO Power Plant in central India collapsed on Sep. 23, 2009 under severe stormy weather, causing serious casualties and massive economic losses, while another, similarly built, survived. So far, there has been no strict and scientific analysis on the cause of the accident. In this paper, finite element method is used to simulate the effect of wind loads and the whole collapse procedure based on the investigation of information about the design, the construction, the site related records, etc. The results show that the initial part of the chimney destroyed is the top of the structure (specifically the construction platform and the partial top cylinder wall of the chimney); then the debris from the top fells and crashes the lower part of the structure, eventually leading to the whole structure collapsing. The analysis results are basically consistent with the observation of the debris and the toppling scene and what the witnesses described, and scientifically clarify the actual cause of the chimney collapse. In addition, by comparing the chimney design codes between the USA and China, along with the analysis results, some suggestions are proposed to prevent similar accidents in chimney projects.
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Yang, Fang, De Peng Lv, Hua Cao, Yan Fang Zhou, and Yu Rong Wu. "The Appraisal Example of the Reliability and Seismic Performance of a Reinforced Concrete Chimney." Applied Mechanics and Materials 204-208 (October 2012): 2399–404. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.2399.
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In the state that the chimney is being used, we evaluate the seismic performance of the reinforced concrete chimney on the basis of testing the tilt, mechanical properties and chemical composition, configuration of the steel and construction measures, the lining damage, the cylinder damage, the subsidiary systems and dynamic characteristics of the chimney. The results show that: For the long-term wind action, corrosion and hot action, and lower level of construction and lower design standards, the reliability of the chimney structure can’t meet the current standards requirements, and need to take appropriate measures to be reinforced; but the seismic performance of the chimney structure can meet current standards requirements.
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Domede, Nathalie, Luisa Pena, and Nicolas Fady. "Historical review of lighthouse design under wind load: the Ile Vierge lighthouse." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 377, no. 2155 (August 19, 2019): 20190167. http://dx.doi.org/10.1098/rsta.2019.0167.
Повний текст джерелаАнотація:
The purpose of the study presented here is to describe the design method used by engineers in the nineteenth and early twentieth centuries to size lighthouse structures and to compare them with current European standards. The historical information presented here is derived from two sources in particular: the archives of the Ile Vierge lighthouse, which was built at the northern tip of Brittany between 1897 and 1902, and the scientific journals, books and courses available at that time. Firstly, the article describes the structure of the Ile Vierge lighthouse, which is the tallest stone lighthouse in Europe. The wind load acting on lighthouses and chimneys was formulated in France by L. Fresnel in 1825. Fresnel's work is compared to W. J. M. Rankine's theory used in the UK. The safety coefficients applied with respect to the stability of the towers in France and the UK in the nineteenth-century are compared. On the occasion of the construction of the Ile Vierge lighthouse, the masonry strength under wind loads led to a discussion among engineers of the French lighthouse authorities. They also worried about the risk of excessive oscillations of the towers, which could cause a dysfunction of the lamp. Thirdly, the standard wind action defined in Eurocode 1 is applied to the Ile Vierge lighthouse. Calculation results are given. A comparative analysis of the ancient and modern methods is presented. Overall, this historical research shows that the designers of lighthouses in the nineteenth-century had the same objectives as today: to build strong, durable structures in which deformations under loads are compatible with serviceability. This article is part of the theme issue ‘Environmental loading of heritage structures’.
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Liu, Xiao Hu, Qiu Yu Chen, Hui Liu, Hui Yu, and Fei Yi Bie. "Urban Solar Updraft Tower Integrated with Hi-Rise Building – Case Study of Wuhan New Energy Institute Headquarter." Applied Mechanics and Materials 283 (January 2013): 67–71. http://dx.doi.org/10.4028/www.scientific.net/amm.283.67.
Повний текст джерелаАнотація:
The upfront cost and technical difficulties of constructing a Solar Updraft Tower is its current bottleneck. Based on the case study of Wuhan New Energy Institute headquarters, this paper proposes to integrate an urban Solar Updraft Tower with a hi-rise building design. The integrated design can reduce the construction cost greatly: the solar chimney integrated with the elevator shaft can avoid large investment on a detached chimney structure; the heat collector can be integrated with the roof garden to provide shaded public space. This type of small-scale, distributed Solar Updraft Tower is relatively low-cost and easy promoting. Potentially, it can build up a distributed energy system as a supplement for the power grid. Furthermore, it can provide valuable experimental data for future researches on large scale Solar Updraft Towers.
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Fajuyitan, O. Kunle, and Adam J. Sadowski. "Imperfection sensitivity in cylindrical shells under uniform bending." Advances in Structural Engineering 21, no. 16 (October 12, 2018): 2433–53. http://dx.doi.org/10.1177/1369433218804928.
Повний текст джерелаАнотація:
Efforts are ongoing to characterise a comprehensive resistance function for cylindrical shells under uniform bending, a ubiquitous structural system that finds application in load-bearing circular hollow sections, tubes, piles, pipelines, wind turbine support towers, chimneys and silos. A recent computational study by Rotter et al. demonstrated that nonlinear buckling of perfect elastic cylinders under bending is governed by four length-dependent domains –‘short’, ‘medium’, ‘transitional’ and ‘long’– depending on the relative influence of end boundary conditions and cross-sectional ovalisation. The study additionally transformed its resistance predictions into compact algebraic relationships for use as design equations within the recently developed framework of reference resistance design. This article extends on the above to present a detailed computational investigation into the imperfection sensitivity of thin elastic cylindrical shells across the most important length domains, using automation to carry out the vast number of necessary finite element analyses. Geometric imperfections in three forms – the classical linear buckling eigenmode, an imposed cross-sectional ovalisation and a realistic manufacturing ‘weld depression’ defect – are applied to demonstrate that imperfection sensitivity is strongly length dependent but significantly less severe than for the closely related load case of cylinders under uniform axial compression. The axisymmetric weld depression almost always controls as the most deleterious imperfection. The data are processed computationally to offer an accurate yet conservative lower-bound algebraic design characterisation of imperfection sensitivity for use within the RRD framework. The outcomes are relevant to researchers and designers of large metal shells under bending and will appeal to computational enthusiasts who are encouraged to adopt the automation methodology described herein to explore other structural systems.
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Napitupulu, S. S., G. Hardiman, and R. R. Tobing. "Technology 5.0 in architecture based on the understanding of environmentalism." IOP Conference Series: Earth and Environmental Science 878, no. 1 (October 1, 2021): 012028. http://dx.doi.org/10.1088/1755-1315/878/1/012028.
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Abstract Technology that developed rapidly in the late 19th century was the beginning of modern times and brought significant changes in every aspect of human life, including architecture. Starting from technology 1.0 until 5.0, technology still has a role in the field of architecture. On one side, technology offers convenience for humans to monitor buildings through the operating system and increases the value of life through its architectural style which is represented by the construction system and materials. On the other hand, technological developments also present problems. The problem that occurs due to technological development that are experienced globally is environmental damage. The purpose of this study is to determine the appropriate technology for use in buildings based on an understanding of environmental science. This study uses a qualitative method regarding the primary literature from books and journals (national and international). The results of this study concluded that through understanding the science of environmentalism, the basis for creating a design must begin with an understanding of the natural conditions of the design area. Henceforth, technology in architectural buildings is not in the form of mechanical technology that potentially increases the amount of building heat, but rather in technology that supports the natural performance inside the building in the form of wall material, new approach in terms of building openings, development of solar panel, windmills, and chimneys technology.
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Fang, Shao Wen, and Xing Fei Yuan. "Construction Analysis of the Chimney of Solar Thermal Power Station." Applied Mechanics and Materials 283 (January 2013): 41–46. http://dx.doi.org/10.4028/www.scientific.net/amm.283.41.
Повний текст джерелаАнотація:
A 100MW solar chimney is high as one thousand meters, belonging to ultra-high-rise structure. Considering the complicated load condition, the large scale and long period of construction process, construction analysis is important to the structure. Using element birth and death technology in ANSYS, the whole construction process is simulated in this paper. Numerical results indicate that the deformation and internal force of the structure change a lot during the construction process. Great differences exist in property and magnitude between construction status and design status. To investigate the stability of the structure under wind and gravity load, the first eigen buckling mode with a value of L/300 and construction deformation are considered as initial imperfection respectively. The results show the ultimate bearing capacity of the structure considering construction deformation is lower than that considering the first-order initial imperfection.
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Abdelsalam, Emad, Fares Almomani, Feras Kafiah, Eyad Almaitta, Muhammad Tawalbeh, Asma Khasawneh, Dareen Habash, Abdullah Omar, and Malek Alkasrawi. "A New Sustainable and Novel Hybrid Solar Chimney Power Plant Design for Power Generation and Seawater Desalination." Sustainability 13, no. 21 (November 2, 2021): 12100. http://dx.doi.org/10.3390/su132112100.
Повний текст джерелаАнотація:
This study presents a case study of a novel hybrid solar chimney power plant (HSCPP) design’s performance in the city of Doha, Qatar. The HSCPP construction is similar to the traditional solar chimney power plant (SCPP) but with the addition of water sprinklers installed at the top of the chimney. This allowed the solar chimney (SC) to operate as a cooling tower (CT) during the nighttime and operate as an SC during the daytime, hence providing a continuous 24-h operation. The results showed that the HSCPP produced ~633 MWh of electrical energy per year, compared to ~380 MWh of energy produced by the traditional SCPP. The results also showed that the HSCPP was able to produce 139,000 tons/year of freshwater, compared to 90,000 tons/year produced by the traditional SCPP. The estimated CO2 emission reduction (~600 tons/year) from the HSCPP is twice that of the traditional SCPP (~300 tons/year). The results clearly show that the HSCPP outperformed the traditional SCPP.
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Ratanachotinun, Jaran, and Pithan Pairojn. "Assessment of the effectiveness and practical feasibility of glass solar chimney walls by open frame in Thailand." Building Services Engineering Research and Technology 38, no. 2 (September 24, 2016): 151–62. http://dx.doi.org/10.1177/0143624416669833.
Повний текст джерелаАнотація:
This research will assess the effectiveness of glass solar chimney wall by open frame (GSCW-O) and compare it with one-layer glass wall (OLGW) in Thailand. The results showed that the use of a GSCW-O can reduce the inside temperature compared with that of OLGW by around 2–4℃ annually, providing heat transfer to the outside, as well as limiting the relative humidity (RH) to 60%, which protects against the occurrence of fungi that cause allergies. The research also found that GSCW-O results in 10–20% less energy consumption when compared to OLGW. In addition being five times cheaper than insulation glass, the payback period for GSCW-O is only 5–6 years. The questionnaire results were satisfactory and proved GSCW-O is very good in practice, pleasing in design, and providing significant energy savings. Testing of hydroponic cultivation in a GSCW house also showed satisfactory growth with a lack of pests, resulting from controlled temperature, humidity, and protection from the elements. For a tropical climate such as Thailand’s, GSCW-O is a suitable design for the reduction in energy consumption and for sustainable architecture. Practical application This research provides helpful information on glass solar chimney wall by open frame for both the owners and developers by adopting an energy efficient building for sustainable energy conservation. For tropical country like Thailand, glass solar chimney wall by open frame is a suitable design and the best alternative for saving energy and global environmental conservation in the building industry.
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Tlili, Ons, Hatem Mhiri, and Philippe Bournot. "Effect of chimney design on flow induced by a heat source in a room." Building Simulation 8, no. 5 (May 27, 2015): 567–77. http://dx.doi.org/10.1007/s12273-015-0231-x.
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AGBETILOYE, LANRE ABEL, Fatai O. Anafi, and Nua O. Omisanya. "Design, Construction and Performance Evaluation of Ginger Mixed Mode Solar Dryer Integrated with Latent Heat Storage." FUOYE Journal of Engineering and Technology 7, no. 2 (June 30, 2022): 210–16. http://dx.doi.org/10.46792/fuoyejet.v7i2.759.
Повний текст джерелаАнотація:
This study is concerned with the design, simulation, construction and performance evaluation of a ginger solar dryer integrated with latent heat storage. It was done to address the problem of complete non-availability of conserved energy to precede the drying process for some times immediately after the sunshine hours have elapsed; thereby reducing the wide gap between the solar energy demand and supply. The ginger solar dryer was tested to dry 6 kg of sliced ginger rhizomes. The dimensions of the dryer were calculated by design to be as follows: 1.5638 m, 1.6302 m2 and 1.155 m for collector length, collector area and chimney height respectively. An experiment was conducted to blend Aluminium powder with shea butter at elevated mass fraction of (1 – 5) %wt of Aluminium powder. The third level composition (3%/97%) was considered the most appropriate due to its moderate thermal conductivity of 0.053762 W/mK and highest latent heat of fusion - 164.53 KJ/kg. The ginger solar dryer was tested with ginger slices of (3 – 5) mm average thickness from 9:00 am to 11:00 pm of 11th June, 2019. The average drying rate, collector efficiency and drying efficiency for the period were kg/s, 77% and 30% respectively
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Lipnicki, Zygmunt, Marta Gortych, Anna Staszczuk, Tadeusz Kuczyński, and Piotr Grabas. "Analytical and Experimental Investigation of the Solar Chimney System." Energies 12, no. 11 (May 29, 2019): 2060. http://dx.doi.org/10.3390/en12112060.
Повний текст джерелаАнотація:
In this, paper the authors propose a new simplified method of solving the problem of air flow through a solar chimney system using a classical system of equations for the principles of conservation (momentum, mass, and energy), as well as a general solution to research the problem using similarity theory. The method presented in this paper allows one to design a solar chimney. The theoretical analysis was compared with experimental studies on existing solar towers. The experimental and theoretical studies were satisfactorily consistent. For clarity, the phenomenon of heat flow in the solar chimney was described using dimensionless numbers, such as the Reynolds, Grashof, Galileo, Biot, and Prandtl numbers. In the equations for the dimensionless geometric parameters, the ratios of the collector radius to the thickness gap, height, and chimney radius were used. The method used to test the system of equations allows us to analyse various solar collectors easily. In the scientific literature, there is a lack of a simple calculation method to use in engineering practice, suitable for each type of solar chimney independent of dimensions and construction parameters.
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Zheng, Yi, Wei Hong Xia, and Ping Cao. "Developing of Air Pollution Control Engineering." Advanced Materials Research 663 (February 2013): 831–35. http://dx.doi.org/10.4028/www.scientific.net/amr.663.831.
Повний текст джерелаАнотація:
Air pollution control engineering is a compulsory special course for students whose major is Environmental Engineering. Through leaning this course, the students should know air pollutants and environmental quality standard, air pollution and weather, air diffusion mode and estimation of pollutant concentration, chimney height design, air pollution factors and control principles, basic methods, foundation of dust-cleaning technology, performance of dust-cleaner, mechanic cleaner, wet dust-cleaner, filter cleaner, electric cleaner, adsorption, catalytic transformation, treatment of exhaust gas containing SO2, treatment of exhaust gas containing NOx, treatment of exhaust gas containing fluorine, treatment of organic exhaust gas, treatment of tail gases, treatment of odor. This paper first analyzes the characteristics and probes the problems of this course prior to construction. Then it proposes a developing plan for the course: description of teaching contents prior to construction, aim for this class and construction, improvement of teaching methods and modes, and etc.
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Djehiche, Abdelkader, Rekia Amieur, and Mustafa Gafsi. "Seepage through Earth Dams with Chimney Drain on Pervious Foundation." Advanced Materials Research 452-453 (January 2012): 538–42. http://dx.doi.org/10.4028/www.scientific.net/amr.452-453.538.
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This paper presents an experimental study of a homogenous earth dam. The work is focused to the search of solutions of problems encountered in the earth dams after their construction. One of the major problems is the choice and design of systems of drainage. The effective drainage system to prevent harmful accumulations of excess water is one of the most important roles of dams. Efficient drainage systems can improve the safety of earth dams. The paper presented herein reports the results obtained from the experimental study. Empiric relations have been obtained which can be help in the control of the flow rate in the chimney drain of the earth dams on pervious foundation, which can increase safety earth dams
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Shaeri, Jalil, Mohammadjavad Mahdavinejad, and Mohammad Hossein Pourghasemian. "A new design to create natural ventilation in buildings: Wind chimney." Journal of Building Engineering 59 (November 2022): 105041. http://dx.doi.org/10.1016/j.jobe.2022.105041.
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CHEN, CHERN-HWA. "SEISMIC ASSESSMENT OF A RETROFITTED CHIMNEY BY FEM ANALYSIS AND FIELD TESTING." International Journal of Structural Stability and Dynamics 04, no. 03 (September 2004): 337–59. http://dx.doi.org/10.1142/s0219455404001264.
Повний текст джерелаАнотація:
The Chi-Chi Earthquake that struck Taiwan in 1999 damaged a 250 m tall chimney located in central Taiwan. To understand the dynamic behavior, failure trigger mechanism, and seismic performance of the chimney that has been rehabilitated, a study using experimental and analytical approaches was carried out. The ambient vibration test, together with a system identification approach, was used to evaluate the dynamic characteristics of the chimney. A subspace approach with an instrumental variable concept was used in the system identification. The dynamic behavior of the chimney was also simulated by a 3D finite element analysis using the commercial software SAP2000. Finally, the design code of ASCE 1975 was adopted to check the buckling capacity of the steel flues in the chimney structure. The results indicated that the calculated stresses correspond well with the actual damages observed in the steel flues.
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Bloss, Vinícius, Camila Fernandes Cardozo, Flávia Schwarz Franceschini Zinani, and Luiz Alberto Oliveira Rocha. "Evaluation of 3-D Computational Model of Oscillating Water Column Converter with Constructal Design with Three Degrees of Freedom and Limited Chimney Height." Defect and Diffusion Forum 407 (March 2021): 128–37. http://dx.doi.org/10.4028/www.scientific.net/ddf.407.128.
Повний текст джерелаАнотація:
Theoretically, ocean waves contain enough mechanical energy to supply the entire world’s demand and, as of late, are seen as a promising source of renewable energy. To this end, several different technologies of Wave Energy Converters (WEC) have been developed such as Oscillating Water Column (OWC) devices. OWCs are characterized by a chamber in which water oscillates inside and out in a movement similar to that of a piston. This movement directs air to a chimney where a turbine is attached to convert mechanical energy. The analysis conducted was based on the Constructive Design Method, in which a numerical study was carried out to obtain the geometric configuration that maximized the conversion of wave energy into mechanical energy. Three degrees of freedom were used: the ratio of height to length of the hydropneumatic chamber (H1/L), the ratio of the height of the chimney to its diameter (H2/d) and the ratio of the width of the hydropneumatic chamber to the width of the wave tank (W/Z). A Design of Experiments (DoE) technique coupled with Central Composite Design (CCD) allowed the simulation of different combinations of degrees of freedom. This allowed the construction of Response Surfaces and correlations for the efficiency of the system depending on the degrees of freedom (width and height of the chamber), as well as the optimization of the system based on the Response Surfaces.
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Motyl, Przemysław, Marcin Wikło, Julita Bukalska, Bartosz Piechnik, and Rafał Kalbarczyk. "A New Design for Wood Stoves Based on Numerical Analysis and Experimental Research." Energies 13, no. 5 (February 25, 2020): 1028. http://dx.doi.org/10.3390/en13051028.
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This work proposes a comprehensive approach to modifying the design of wood stoves with a heating power up to 20 kW, including design works, simulations, and experimental research. The work is carried out in two stages. In the first part, a numerical model is proposed of the fireplace insert including fluid flow, the chemical combustion reaction, and heat exchange (FLUENT software is applied to solve the problem). The results of the simulation were compared with the experiment carried out on the test bench. A comparison of the experimental and numerical results was made for the temperature distribution along with the concentration of CO, CO2, and O2. Construction changes were proposed in the second stage, together with numerical simulations whose goal was an increase in the efficiency of the heating devices. The results obtained show that the average temperature in the chimney flue, which has a low value that is a determinant of the higher efficiency of the heating devices, was reduced relative to the initial design of the fireplace intake by 11%–16% in all cases. The retrofit enhanced stable heat release from the wood stove, which increased the efficiency and reduced the harmful components of combustion.
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Cheng, Xudong, Long Shi, Peng Dai, Guomin Zhang, Hui Yang, and Jie Li. "Study on optimizing design of solar chimney for natural ventilation and smoke exhaustion." Energy and Buildings 170 (July 2018): 145–56. http://dx.doi.org/10.1016/j.enbuild.2018.04.016.
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Moosavi, Leila, Majid Zandi, Mokhtar Bidi, Ehsan Behroozizade, and Iman Kazemi. "New design for solar chimney with integrated windcatcher for space cooling and ventilation." Building and Environment 181 (August 2020): 106785. http://dx.doi.org/10.1016/j.buildenv.2020.106785.
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Klimanek, Adam, Wojciech Kostowski, Grzegorz Burda, Paweł Bargiel, Andrzej Szlęk, and Krzysztof Górny. "Preliminary design and modelling of a gas-fired thermoelectric generator." Thermal Science 20, no. 4 (2016): 1233–44. http://dx.doi.org/10.2298/tsci151128110k.
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The paper discusses modelling of coupled heat transfer and electricity generation in a thermoelectric generator designed for reliable island-mode power supply. The considered generator is a new concept of a low power supply (50 W) whose aim is to provide electricity for remote gas pressure reduction stations with the purpose to maintain the control and automation equipment. This equipment contributes to the system safety and minimizes the risk of unintended methane emissions. The thermoelectric generator is designed for reliable and maintenance-free operation and power supply. Natural gas is burned in a partially premixed burner and the flue gas heats the hot side of the thermoelectric generator. The combustion air cools the cold side of the thermoelectric generator, providing the temperature difference required for electricity generation occurring based on the Seebeck effect. The flow of air and flue gas through the system is driven by chimney draft. The developed model couples the heat transfer on the hot and the cold side, as well as the generation of electrical energy inside the thermoelectric modules. The model takes into account convection and conduction in the gas flow conduits and in finned heat exchangers of the cold and hot sides. The analysis demonstrates the relevance of design and operational parameters on the boundary temperatures of the thermoelectric modules. The obtained results will be used in further (ongoing) phase leading to the design and construction of a prototype electricity generator dedicated for island-mode supply.
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Ratanachotinun, Jaran, Nat Kasayapanand, Jongjit Hirunlabh, Sopa Visitsak, Sombat Teekasap, and Joseph Khedari. "A design and assessment of solar chimney of bioclimatic house wall and roof for construction in the housing market of Thailand." Building Services Engineering Research and Technology 37, no. 6 (July 28, 2016): 694–709. http://dx.doi.org/10.1177/0143624416647761.
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Ding, Ying, and Hong Zhang. "The Interpretation and Inheritance of Green Local Building Material System in Modern Architecture - Case Study of Century Fishing Village Eelgrass Cottage Resort in Dayu Island, Shidao Bay, Jiaodong Peninsula." Applied Mechanics and Materials 878 (February 2018): 140–45. http://dx.doi.org/10.4028/www.scientific.net/amm.878.140.
Повний текст джерелаАнотація:
Dayu island sea cottage is the most typical carrier of the fish culture in the coastal area of Jiaodong. In recent years, economic development, changes in fishermen's living habits led to a the dismantling of a large number of traditional sea cottages and gradual disappearing of unique Dayu island building materials system comprising of eelgrass roof, local granite stone wall and soil kang chimney. In order to protect the local cultural characteristics so they can be passed down, the paper sorted out the original traditional eelgrass cottage building material system. The project of Century Fishing Village Eelgrass Cottage Resort represents experimentation and innovation on the original material system, forming a novel construction material system. Such a system not only satisfies the requirement of new buildings on thermal insulation, energy and space conservation, but also enhances safety and resistance to wind, erosion. The wide adoption of the new material system in new buildings enhances the technique of integrating traditional construction materials and modern architecture in both form and function, making it an ideal design strategy.
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Qiu, Yikun, Changdong Zhou, Siha A, and Guangwei Zhang. "A spectral-acceleration-based combination-type earthquake intensity measure for high-rise stack-like structures." Advances in Structural Engineering 23, no. 7 (December 23, 2019): 1350–66. http://dx.doi.org/10.1177/1369433219894237.
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Ground motion intensity measures are of great importance for the seismic design of structures. A well-chosen intensity measure will reduce the detailed ground motion record selection effort for the nonlinear dynamic structural analyses. In this article, a spectral-acceleration-based combination-type earthquake intensity measure is presented. This intensity measure considers the higher modes effect and period elongation effect due to nonlinear deformation at the same time. The modal mass participation factors are determined to take weighting coefficients and the product of elastic first-mode period T1 and a constant C is expressed to represent the elongated period. Therefore, the proposed intensity measure is a combination of earthquake ground motion characteristics, elastic structural responses, higher modes participation, and the period elongation effect due to inelastic structural behaviors. Four three-dimensional models of reinforced concrete stack-like structures including a 240 m-high chimney, a 180 m-high chimney, a 120 m-high chimney, and a 42.3 m-high water tower are established and analyzed in ABAQUS to investigate the correlation between the intensity measure and the maximum curvatures under 44 far-field ground motions and 28 near-fault ground motions with a pulse-like effect. With the optimal vibration modes and the proper period elongation coefficient, the efficiency of the introduced intensity measure is compared with the other 15 intensity measures. The results indicate that the proposed intensity measure is believed to be a good choice for high-rise stack-like structures, especially under the near-fault ground motions with pulse-like effect.
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Afriyie, J. K., and A. Bart-Plange. "Performance Investigation of a Chimney-Dependent Solar Crop Dryer for Different Inlet Areas with a Fixed Outlet Area." ISRN Renewable Energy 2012 (November 5, 2012): 1–9. http://dx.doi.org/10.5402/2012/194359.
Повний текст джерелаАнотація:
The paper describes the performance of a direct-mode solar crop dryer with a solar chimney. Tests were performed for three differently inclined drying-chamber roofs, each with three inlet areas for a given exit area. Cassava was used as the test crop. The results show that the increase in the inlet area for a given exit area can improve the ventilation in the dryer. However, this does not necessarily improve the drying performance of the direct-mode dryer. A wide inlet area for a given exit area can only improve the drying performance of the direct-mode dryer in a geographical location of low relative humidity. It is therefore not advisable to just copy the design of a direct-mode dryer from one location to another without regard to the ambient relative humidity. The designer and builder of the dryer must consider the relative humidity as a prime factor in the design and construction of direct-mode dryers, which are highly sensitive to the ambient relative humidity.
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Ahmed, Muna, Ali Al-Salihi, and Hazim Hussain. "Testing the performance of a solar energy cooling system in Baghdad city." Przegląd Naukowy Inżynieria i Kształtowanie Środowiska 30, no. 2 (July 5, 2021): 283–92. http://dx.doi.org/10.22630/pniks.2021.30.2.24.
Повний текст джерелаАнотація:
Renewable energy resources have become a promissory alternative to overcome the problems related to atmospheric pollution and limited sources of fossil fuel energy. The technologies in the field of renewable energy are used also to improve the ventilation and cooling in buildings by using the solar chimney and heat exchanger. This study addresses the design, construction and testing of a cooling system by using the above two techniques. The aim was to study the effects of weather conditions on the efficiency of this system which was installed in Baghdad for April and May 2020. The common weather in these months is hot in Baghdad. The test room of the design which has a size of 1 m3 was situated to face the geographical south. The test room is thermally insulated and connected to a solar chimney which generates a convection current to draw the air out of the room through a heat exchanger. The heat exchanger was submerged in a water tank of 2 m length, 1 m width and 1 m height. It was also covered with a layer of soil mixture with a thickness of 10 cm. The experiment simulates the natural conditions of a shallow water surface, connected to the room from the other side. The study results revealed that the air temperature inside the test room was lower than that of the ambient air outside. Pearson correlation coefficient showed that there was a strong direct relationship between solar radiation, temperature and wind speed from one side and the cooling efficiency from the other side. Also, there was a negative correlation between relative humidity and cooling efficiency.