Dissertations / Theses on the topic 'Composite phase change material'
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Mustaffar, Ahmad Fadhlan Bin. "Irregular aluminium foam and phase change material composite in transient thermal management." Thesis, University of Newcastle upon Tyne, 2016. http://hdl.handle.net/10443/3338.
Full textHuang, Yaoting. "Fundamental studies on nano-composite phase change materials (PCM) for cold storage applications." Thesis, University of Birmingham, 2019. http://etheses.bham.ac.uk//id/eprint/8844/.
Full textBoozula, 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/.
Full textGreen, Craig Elkton. "Composite thermal capacitors for transient thermal management of multicore microprocessors." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/44772.
Full textLi, Chuan. "Thermal energy storage using carbonate-salt-based composite phase change materials : linking materials properties to device performance." Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7242/.
Full textBoozula, 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/.
Full textHarle, Thibault. "Création et caractérisation d'un matériau de construction composite incorporant un nouveau matériau à changement de phase solide-solide." Thesis, Cergy-Pontoise, 2016. http://www.theses.fr/2016CERG0874.
Full textIn a context of reduction of energy consumption in buildings, new buildings materials are developed. Thermal regulations require energy efficiency to buildings. They must be less impacting on the environment while ensuring occupant comfort.In this work is presented the development of a new composite building material incorporating a phase change material.PCM are able to exchange passively heat energy with their environment. It thus allow a passive control of the interior temperature of buildings.After a state of the art on PCM and plaster, a part is dedicated to synthesis and physicochemical characterisation of a new solid/solid PCM. In a third part the incorporation of the PCM previously synthesized in plaster is then developped. The composite material is mechanically and thermally characterized.In a last time environmental assessments of the PCM and the composite material are performed
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.
Full textKinkelin, Christophe. "Etude expérimentale d’un amortisseur thermique composite MCP-NTC." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEI100/document.
Full textThe purpose of the studied thermal damper is to smooth the temperature peaks of transient electronic components via a composite structure consisting of an array of carbon nanotubes (CNT) filled with solid-liquid phase change material (PCM), the whole being embedded in a silicon (Si) casing. This passive system is intended to increase the thermal inertia per unit of volume of the electronic component thanks to the latent heat of the PCM while maintaining a high thermal conductance thanks to the CNT. A versatile test bench was specifically developed in order to characterize the different generations of samples fabricated by the partners of the THERMA3D project. The thermal excitation of the front side of the sample is generated by a laser and the thermal response is measured simultaneously on the front and back sides by an infrared camera. A selected paint can be deposited on the sample in order to access its temperature by means of a dedicated calibration. Parameter estimation methods were developed in order to quantify both main characteristics of the thermal damper: its heat storage capacity and its thermal resistance. The sensitivities of the thermal resistance to the features of the Si/CNT connection and to the length of the CNT were studied and it was found out that the interfacial thermal resistances Si/CNT are dominant in the system. Thermal cycling tests enabled to assess the reliability of the thermal damper in an accelerated manner. The behavior of the PCM and the quality of the sealing material were optically analyzed. Besides, the infrared visualization of the CNT array through the semi-transparent silicon enabled to identify the highest of both Si/CNT interfacial thermal resistances. Finally, a non-destructive testing method for the evaluation of the quality of Si/CNT interfaces was developed for the latest generation of thermal dampers
Lin, JiaCheng, and HaoRan Teng. "Influence of Nucleation Techniques on the Degree of Supercooling and Duration of Crystallization for Sugar Alcohol as Phase Change Material : Investigation on erythritol-based additiveenhanced Composites." Thesis, KTH, Energiteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-257758.
Full textAtt använda fasändringsmaterial (PCM) för termisk energilagring i form av latent värme (LTES) har tidigare extensivt forskats och undersökts som en lösning för att minska utsläppen av växthusgaser från energiförbrukning. För att utnyttja spillvärme från industriella processer för LTES-ändamål uppstod en efterfrågan på PCM som ändrar fas i temperaturer mellan 100 °C - 200 °C. Detta krav på högre temperatur gjorde att de flesta av de tidigare aktuella materialen inte kunde tillämpas eftersom de hade mycket lägre smält- och kristalliseringstemperaturer. Med detta i åtanke har en ny generation av PCM bestående av sockeralkoholer (SA) föreslagits. Erytritol ses som ett särskilt lovande SA med goda egenskaper för LTES-ändamål. Den har dock visat sig drabbas av svår underkylning, vilket gör den opålitligt i verkliga tillämpningar. För att utrota detta problem blandades två tillsatser, Graphene Oxide (GO) och Polyvinylpyrrolidone (PVP) vid olika massfraktioner med ren erytritol för att bilda en komposit som studerades med metoden Temperature-history (T-history) för att bestämma dess effektivitet på att minska underkylningen. Resultaten visar att GO på sin mest effektiva massfraktion minskar underkylningen med 28 o C och tillsats av PVP lyckats minska den med som mest 31 o C. Påverkningarna på varaktighet av kristallisering dokumenterades och analyserades med samma metod. Det var observerad att varaktigheten av kristallisering ökades med ökande massfraktioner av tillsatserna. Även andra viktiga egenskaper hos kompositerna studerades för att avgöra rimligheten att använda dessa för industriella tillämpningar. Det inkluderar analys av lagringskapaciteten genom latent värme, förändringar i viskositet tillsammans med påverkan på kompositernas termiska diffusivitet.
Lin, Jiacheng, and Haoran Teng. "Influence of Nucleation Techniques on the Degree of Supercooling and Duration of Crystallization for Sugar Alcohol as Phase Change Material : Investigation on erythritol-based additiveenhanced composites." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-264271.
Full textAtt använda fasändringsmaterial (PCM) för termisk energilagring i form av latent värme (LTES) har tidigare extensivt forskats och undersökts som en lösning för att minska utsläppen av växthusgaser från energiförbrukning. För att utnyttja spillvärme från industriella processer för LTES-ändamål uppstod en efterfrågan på PCM som ändrar fas i temperaturer mellan 100 °C - 200 °C. Detta krav på högre temperatur gjorde att de flesta av de tidigare aktuella materialen inte kunde tillämpas eftersom de hade mycket lägre smält- och kristalliseringstemperaturer. Med detta i åtanke har en ny generation av PCM bestående av sockeralkoholer (SA) föreslagits. Erytritol ses som ett särskilt lovande SA med goda egenskaper för LTES-ändamål. Den har dock visat sig drabbas av svår underkylning, vilket gör den opålitligt i verkliga tillämpningar. För att utrota detta problem blandades två tillsatser, Graphene Oxide (GO) och Polyvinylpyrrolidone (PVP) vid olika massfraktioner med ren erytritol för att bilda en komposit som studerades med metoden Temperature-history (T-history) för att bestämma dess effektivitet på att minska underkylningen. Resultaten visar att GO på sin mest effektiva massfraktion minskar underkylningen med 28 oC och tillsats av PVP lyckats minska den med som mest 31 oC. Påverkningarna på varaktighet av kristallisering dokumenterades och analyserades med samma metod. Det var observerad att varaktigheten av kristallisering ökades med ökande massfraktioner av tillsatserna. Även andra viktiga egenskaper hos kompositerna studerades för att avgöra rimligheten att använda dessa för industriella tillämpningar. Det inkluderar analys av lagringskapaciteten genom latent värme, förändringar i viskositet tillsammans med påverkan på kompositernas termiska diffusivitet.
Bahrar, Myriam. "Contribution au développement et à l’analyse d’une enveloppe de bâtiment multifonctionnelle dans le cadre de l’optimisation du confort dans l’habitat." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEE001/document.
Full textThe building sector has a great potential to improve energy efficiency and reduce the greenhouse gas emissions. Improvements to the building envelope and Innovations in building materials have the potential to achieve sustainability within the built environment. This PhD thesis focuses on the development of multifunctional façade elements in order to optimize the building energy consumption while maintaining an optimal indoor human thermal comfort. The proposed solution consist of using passive storage by means of phase change materials associated with alternative construction materials such as textile reinforced concrete (TRC). The aim of the study is to characterize mechanical and thermal properties of TRC composites and to evaluate the effect of PCMs on indoor thermal comfort. To meet these objectives, experimental devices have been set up for the characterization (at the component scale and in situ) of the mechanical and thermal behaviour of different TRC panels. In parallel, we have developed a numerical model for the prediction of wall temperature profiles. Finally, a multi-objective optimization of the façade elements is carried out using genetic algorithms to determine the better combinations able to combine the energy performance with the mechanical performance
Djamai, Zakaria Ilyes. "Contribution à la caractérisation multi-échelle de composites textile mortier à inertie thermique renforcée par des matériaux à changement de phase (composite MCP-TRC) : application au bâtiment." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEE006.
Full textThe building sector has a strong potential for improvement in terms of thermal performance and attenuation of the ecological footprint. A good design of the envelope as well as the structure of the building is fully integrated into these objectives and can contribute effectively to the reduction of energy consumption. This is accompanied by a relevant choice of materials and constructive systems composing the envelope and the structure of the buildingThe research work presented in this thesis is fully integrated in this context and aims at the development of an innovative composite resulting from the association of a modified cementitious matrix by the addition of phase change materials (PCM) and a textile reinforcement, the resulting composite will commonly be called 'MCP-TRC'.A detailed study of the mechanical and thermal behaviour of the 'PCM-TRC' composite was carried out. A particular interest was brought during the work presented to the understanding of the interactions between PCM and cement matrix and between cement matrix modified by the addition of PCM and textile reinforcement. These interactions govern the mechanical and thermal behaviour of PCM-TRC composites.Two innovative concepts (lightweight slabs and PCM-TRC sandwich panels) integrating the PCM-TRC composites were proposed. The mechanical and thermal performances of the two concepts were evaluated. The results obtained are very encouraging and promote the emergence of this type of composites in the building industry
Mint, brahim Maimouna. "Méthodes d'éléments finis pour le problème de changement de phase en milieux composites." Thesis, Bordeaux, 2016. http://www.theses.fr/2016BORD0157/document.
Full textIn this thesis we aim to develop a numerical tool that allow to solve the unsteady heatconduction problem in a composite media with a graphite foam matrix infiltrated witha phase change material such as salt, in the framework of latent heat thermal energystorage.In chapter 1, we start by explaining the model that we are studying which is separated in three sub-parts : a heat conduction problem in the foam, a phase change problem in the pores of the foam which are filled with salt and a contact resistance condition at the interface between both materials which results in a jump in the temperature field.In chapter 2, we study the steady heat conduction problem in a composite media withcontact resistance. This allow to focus on the main difficulty here which is the treatment of the thermal contact resistance at the interface between the carbon foam and the salt. Two Finite element methods are proposed in order to solve this problem : a finite element method based on Lagrange P1 and a hybrid dual finite element method using the lowest order Raviart-Thomas elements for the heat flux and P0 for the temperature. The numerical analysis of both methods is conducted and numerical examples are given to assert the analytic results. The work presented in this chapter has been published in the Journal of Scientific Computing [10].The phase change materials that we study here are mainly pure materials and as a consequence the change in phase occurs at a single point, the melting temperature. This introduces a jump in the liquid fraction and consequently in the enthalpy. This discontinuity represents an additional numerical difficulty that we propose to overcome by introducing a smoothing interval around the melting temperature. This is explained in chapter 3 where an analytical and numerical study shows that the error on the temperature behaves like " outside of the mushy zone, where _ is the width of the smoothing interval. However, inside the error behaves like p " and we prove that this estimation is optimal due to the energy trapped in the mushy zone. This chapter has been published in Communications in Mathematical Sciences [58].The next step is to determine a suitable time discretization scheme that allow to handle the non-linearity introduced by the phase change. For this purpose we present in chapter 4 four of the most used numerical schemes to solve the non-linear phase change problem : the update source method, the enthalpy linearization method, the apparent heat capacity method and the Chernoff method. Various numerical tests are conducted in order to test and compare these methods for various types of problems. Results show that the enthalpy linearization is the most accurate at each time step while the apparent heat capacity gives better results after a given time. This indicates that if we are interestedin the transitory states the first scheme is the best choice. However, if we are interested in the asymptotic thermal behavior of the material the second scheme is better. Results also show that the Chernoff scheme is the fastest in term of calculation time and gives comparable results to the one given by the first two methods.Finally, in chapter 5 we use the Chernoff method combined with the hybrid-dual finiteelement method with P0 and the lowest order Raviart-Thomas elements to solve thenon-linear heat conduction problem in a realistic composite media with a phase change material. Numerical simulations are realised using 2D-cuts of X-ray images of two real graphite matrix foams infiltrated with a salt. The aim of these simulations is to determine if the studied composite materials could be assimilated to an equivalent homogeneous phase change material with equivalent thermo-physical properties. For all simulationsconducted in this work we used the free finite element software FreeFem++ [41]
Mallow, Anne. "Stable paraffin composites for latent heat thermal storage systems." Thesis, Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/54406.
Full textHuang, Ruomeng. "Confined nanoscale chalcogenide phase change material and memory." Thesis, University of Southampton, 2015. https://eprints.soton.ac.uk/379321/.
Full textKhillarkar, Dipendra B. "Melting of a phase change material in horizontal annuli." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0025/MQ50629.pdf.
Full textKhillarkar, Dipendra B. "Melting of a phase change material in horizontal annuli." Thesis, McGill University, 1998. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=21307.
Full textTo enhance the heat transfer rate during melting in horizontal annular containers various innovative passive methods were examined. Eccentric annular configurations are identified as superior to concentric tubular geometries due to the vertically upward orientation of the buoyancy force in the melt phase at higher Rayleigh numbers. In addition to this the effect of flipping the container at pre-selected times after initiation of melting as a measure to increase the heat transfer rate during the last stage of the melting process is also examined and discussed.
Sinclair, Chad. "Co-deformation of a two-phase FCC/BCC material /." *McMaster only, 2001.
Find full textSözen, Zeki Ziya. "Thermal energy storage by agitated capsules of phase change material." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25974.
Full textApplied Science, Faculty of
Chemical and Biological Engineering, Department of
Graduate
Jimoh, Bashir O. "Phase change material optimized for integration with domestic heat pump." Thesis, University of Warwick, 2018. http://wrap.warwick.ac.uk/106911/.
Full textGuo, Qiang M. Eng Massachusetts Institute of Technology. "Evaluation on the thin-film phase change material-based technologies." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/37684.
Full textIncludes bibliographical references (leaves 68-69).
Two potential applications of thin film phase-change materials are considered, non-volatile electronic memories and MEMS (Micro-Electro-Mechanical Systems) actuators. The markets for those two applications are fast growing and rapidly changing, so new materials technologies with superior performance are of great interest. Devices made with thin film phase change materials are shown to offer significant performance improvements for memory applications and new triggering mechanisms for MEMS actuation. IP (Intellectual Property) analyses for both markets indicate significant new IP space in each of them. Rough estimations for cost and revenue are provided.
by Qiang Guo.
M.Eng.
Hagman, Susanna. "The Application of Microencapsulated Biobased Phase Change Material on Textile." Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-10266.
Full textFredi, Giulia. "Multifunctional polymer composites for thermal energy storage and thermal management." Doctoral thesis, Università degli studi di Trento, 2020. http://hdl.handle.net/11572/265328.
Full textMoro, Marjan. "Nano-Characterization of Ceramic-Metallic Interpenetrating Phase Composite Material using Electron Crystallography." Youngstown State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1340223324.
Full textMoreno, Balderrama Juan Ángel. "Phase change materials encapsulation in crosslinked polymer-based monoliths : syntheses, characterization and evaluation of pullulan and black liquor based-monoliths for the encapsulation of phase change materials." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0369/document.
Full textEmulsion-templated polymer based (pullulan, lining and hemicelluloses) monoliths encapsulating butyl stearate as bio-based phase change material (PCM) were synthesized. Polymer-bases were crosslinked with sodium trimetaphosphate (STMP) under alkaline aqueous conditions leading to an interconnected porous network. The influence of the drying process on the obtained composite materials morphology was studied indicating freeze-drying as the most effective technique. Differential Scanning Calorimetry (DSC) studies allow to assess that encapsulation of butyl stearate onto matrices do not alter its phase change thermal properties. Mechanical compression and strain resistance tests allowed to evaluate monoliths potential as heat storage panels installed directly in buildings and greenhouses, STMP crosslinking products were identified by solid-NMR characterization, this allowed to synthetize monoliths at different crosslinking yields to find a formulation that improves PCM encapsulation. Polymer matrices were studied by scanning electron microscopy to identify the pore size distribution obtained in STMP crosslinked materials. This new one-step encapsulating approach appears as efficient and cost-effective and is expected to find a broad development in energy storage applications
Guerra, Alexander Adrian. "Modeling a solar energy collector with an integrated phase-change material." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/54472.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (p. 43).
In this thesis, a finite-element computer model was created to simulate a solar air heater with an integrated-phase change material. The commercially available finite element package ADINA-Fluid was used to generate the model that captures the fundamental physical processes which are necessary in accurately simulate the system. These processes include convective and radiative losses between the working fluid and device. Time varying loads to simulate the available solar energy that can be collected over the course of a day. Most importantly the phase-change material. This was accomplished by defining a material with a temperature-dependent specific heat. The simulation yielded positive results to its validity and can now be used to test different physical geometries and material before a prototype of the solar air heater is produced.
by Alexander Adrian Guerra.
S.B.
Sun, Xinxing. "Phase Transformations and Switching of Chalcogenide Phase-change Material Films Prepared by Pulsed Laser Deposition." Doctoral thesis, Universitätsbibliothek Leipzig, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-224762.
Full textZAHID, NAEEM MUHAMMAD, and SHAHNAWAZ MEHMOOD. "Applications of Ultra Smart Textiles in Sportswear and Garments." Thesis, Högskolan i Borås, Institutionen Textilhögskolan, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-20172.
Full textProgram: Magisterutbildning i Applied Textile Management
Lee, Jae Sang. "Effective properties of three-phase electro-magneto-elastic multifunctional composite materials." Thesis, Texas A&M University, 2003. http://hdl.handle.net/1969.1/1448.
Full textMahdavi, Nejad Alireza. "Numerical Study of Heat and Mass Transfer Using Phase Change Materials." Digital WPI, 2018. https://digitalcommons.wpi.edu/etd-dissertations/500.
Full textKuravi, Sarada. "Numerical Study of Encapsulated Phase Change Material (EPCM) Slurry Flow in Microchannels." Doctoral diss., University of Central Florida, 2009. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4093.
Full textPh.D.
Department of Mechanical, Materials and Aerospace Engineering;
Engineering and Computer Science
Mechanical Engineering PhD
Quant, Colón Laura Marcela. "Study of a urea-based phase change material for thermal energy storage." Thesis, Pau, 2020. http://www.theses.fr/2020PAUU3010.
Full textThis work presents a contribution to the latent heat thermal energy storage LHTES technology by working on both phase change materials PCMs and storage systems that are technically and economically viable for their integration in buildings. Regarding the PCM material, the urea and sodium nitrate eutectic mixture has been previously identified as a good candidate for the Domestic Heating Water (DHW) and heating applications. One of the main objectives of the PhD thesis was the characterization of these aspects to evaluate the urea and sodium nitrate eutectic mixture long term feasibility to be used as a PCM in application. The study of the material includes the development of methodologies that are more practical and representative of the operation in the final application than the traditionally used in PCM characterization. The characterization of the hygroscopicity or water uptake of the urea and sodium nitrate eutectic mixture under different conditions was performed. A sample preparation method and handling conditions are proposed for avoiding the mixture water uptake.The thermal degradation of the urea and sodium nitrate eutectic mixture was evaluated by measuring the thermo-physical behavior after exposure time at different defined temperatures. DSC measurements were carried out to determine the variation of parameters that are directly related to the thermal energy storage of the PCM and its long-term stability. In addition, the degradation products and their influence on the variation of the system properties were assessed.The eutectic mixture showed unforeseen segregation at temperatures above the melting point upon melting and solidification cycles. Several tests were done including thermal cycling, XRD of the segregates, DSC after the redissolution of the segregates in the liquid material, and microscopy (PLM and SEM) of samples cooled down under different conditions. The experiments permitted to stablish a relationship between the operation conditions, more specifically the cooling rates, with the resulting crystal structures which explains the phase segregation in the eutectic mixture, and how to reduce it and how to reverse the process.The study of the supercooling comprised the use of the urea and sodium nitrate eutectic mixture and PEG10000. The experiments were performed in different conditions: sample containers (with different geometries and volumes), cooling rates and heat transfer fluids (HTF) were implemented. Finally, the results served to evaluate the relationship of the supercooling degree with parameters associated with the sample volume, cooling media and PCM parameters. Afterwards, linear regression models were gathered for each material and one for both materials. The specific aim of the chapter is to get a step further into the supercooling understanding and prediction, in order to efficiently design LHTES systems to be used with materials that show supercooling.Finally, regarding the storage system a shell and tubes heat exchanger is studied in order to evaluate the use of devices already commercially available the use as latent heat energy storage LHTES devices. The first objective was to get a deeper understanding of the thermal behavior of the device. The characterization was performed using RT60 paraffin as PCM inside the shell, a well known commercial material, to assure the reproducibility of the results, and water as heat transfer fluid in the tubes. Several flow rates and temperature ranges were used to obtain a greater scope of the operation of the device as LHTES. The work included the determination of the thermal losses, and the study of charging and discharging cycles, initial and final temperatures and flow rates
Shaik, Sania. "Refrigeration Insulation Using Phase Change Material Incorporated Polyurethane Foam for Energy Savings." Thesis, University of North Texas, 2020. https://digital.library.unt.edu/ark:/67531/metadc1707283/.
Full textWang, Guangyao. "An Investigation of Phase Change Material (PCM)-Based Ocean Thermal Energy Harvesting." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/100989.
Full textDoctor of Philosophy
Estep, Gregory Dale. "The influence of extrusion processing and formulation on form-stable phase change material." Pullman, Wash. : Washington State University, 2010. http://www.dissertations.wsu.edu/Thesis/Summer2010/g_estep_062110.pdf.
Full textTitle from PDF title page (viewed on July 28, 2010). "Department of Civil and Environmental Engineering." Includes bibliographical references (p. 24-26).
Chiu, Justin NingWei. "Heat Transfer Aspects of Using Phase Change Material in Thermal Energy Storage Applications." Licentiate thesis, KTH, Kraft- och värmeteknologi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-34263.
Full textQC 20110629
Cold Thermal Energy Storage
Lee, Jun Su. "Bulk micromachined electrothermal microactuator using the hydraulic force of a phase change material." Thesis, Imperial College London, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.430446.
Full textMatthews, Robert. "Use of phase change material for microbiological incubators : designing for low resource settings." Thesis, University of Bristol, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.616870.
Full textGates, 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.
Full textRakkimuthu, Sathyaprabha. "Improved Thermoregulation Of Brain Temperature Using Phase Change Material-Mediated Head Cooling System." University of Cincinnati / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1613750048541054.
Full textIrwin, Matthew A. "Testing of Carbon Foam with a Phase Change Material for Thermal Energy Storage." Ohio University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1399489817.
Full textMahdi, Jasim M. "ENHANCEMENT OF PHASE CHANGE MATERIAL (PCM) THERMAL ENERGY STORAGE IN TRIPLEX-TUBE SYSTEMS." OpenSIUC, 2018. https://opensiuc.lib.siu.edu/dissertations/1533.
Full textWei, Xiupeng. "Multiscale modeling and simulation of material phase change problems: ice melting and copper crystallization." Thesis, University of Iowa, 2010. https://ir.uiowa.edu/etd/904.
Full textBoampong, James Kwadwo. "Solar thermal heating of a glasshouse using phase change material (PCM) thermal storage techniques." Thesis, Brunel University, 2015. http://bura.brunel.ac.uk/handle/2438/12863.
Full textBhansali, Anil P. "Heat transfer resulting from a turbulent, submerged jet impinging on a phase change material." Diss., Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/19568.
Full textGunasekara, Saman Nimali. "Phase Equilibrium-aided Design of Phase Change Materials from Blends : For Thermal Energy Storage." Doctoral thesis, KTH, Kraft- och värmeteknologi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-212440.
Full textEnergi är en integrerad del av samhället men energiprocesser leder till miljöbelastning, och klimatförändringar. Därför är effektiv energianvändning, ökad energieffektivitet och smart energihantering nödvändigt. Värmeenergilagring (TES) är ett attraktivt val för att bemöta detta behov, där ett lagringsalternativ med hög densitet är s.k. fasomvandlingsmaterial (PCM). Ett exempel på ett billigt, vanligt förekommande PCM är systemet vatten-is, vilket har använts av människor i tusentals år. För att tillgodose de många värme- och kylbehov som idag uppstår inom ett brett temperaturintervall, är det viktigt med innovativ design av PCM. Förutom lämplig fasförändringstemperaturer, entalpi och andra termofysikaliska egenskaper, bör PCM också ha robust fasändring, vara miljövänlig och kostnadseffektiv. För att förverkliga storskaliga TES system med PCM, är måste kostnadseffektivitet och robust funktion under många cykler bland de viktigaste utmaningarna. Kostnadseffektiva PCM kan bäst erhållas från naturliga eller industriella material i bulkskala, vilket i huvudsak leder till materialblandningar, snarare än rena ämnen. Blandningar uppvisar dock komplexa fasförändringsförlopp, underkylning och/eller inkongruent smältprocess som leder till fasseparation. Denna doktorsavhandling ger ny kunskap som möjliggör att bulkblandningar kan bli kostnadseffektiva och robusta PCM-material, med hjälp av den systematiskutvärdering av fasjämvikt och fasdiagram. Arbetet visar att detta kräver förståelse av relevanta grundläggande fasjämviktsteorier, omfattande termiska och fysikalisk-kemiska karakteriseringar, och allmänt tillämpliga teoretiska utvärderingar. Denna avhandling specificerar befintlig fasjämviktsteori för PCM-sammanhang, men sikte på att kunna välja robusta PCM blandningar med specifika egenskaper, beroende på tillämpning. Analysen visar att blandningar med en sammansättning som leder till kongruent smältande, där faser i jämvikt har samma sammansättning, är ideala bland PCM-blandningar. Kongruent smältande fasta faser som utgör föreningar eller fasta lösningar av ingående komponenter är därför ideala. Eutektiska blandningar är nästan lika bra som PCM, så länge underkylning inte förekommer. Därmed finns en stor potential för att finna och karakterisera PCM-ideala blandningar som bildar kongruent smältande föreningar eller fasta lösningar. Därigenom kan blandningar med en skarp, reversibel fasändring och utan fasseparation erhållas – egenskaper som liknar rena materialens fasändringsprocess. Vidare kan man, via fasdiagram, påvisa de blandningar som är inkongruent smältande, inklusive peritektiska blandningar, som är direkt olämpliga som PCM. Denna avhandling ger grundläggande kunskap som är en förutsättning för att designa PCM i blandningar. Genom en omfattande state-of-the-art utvärdering av fas-jämviktsbaserad PCM-design lyfter arbetet de PCM-idealiska blandningarna som hittills inte fått någon uppmärksamhet, såsom kongruenta smältande blandningar, och materialkategorierna metallegeringar, polyoler och fetter. Resultatet av arbetet visar dessutom att vissa PCM-material som ibland föreslås är direkt olämpliga då fasdiagram undersöks, bl a pga underkylning och även peritektiska system med fasseparation och degradering av kapaciteten (t ex Glauber-salt och natriumacetat-trihydrat). Denna avhandling specificerar och upprättar grundläggande teori samt tekniker, tillvägagångssätt och förhållanden som är nödvändiga för en omfattande och genomsynlig fasjämviktsbedömning, för utformning av PCM från blandningar för energilagering. Med detta som bas har följande fasdiagramtagits fram fullständigt: för erytritol-xylitol och för dodekan-tridekan, med PCM-potential för låg temperaturuppvärmning (60-120 °C) respektive frysning (-10 °C till -20 °C) utvärderas fullständigt. Erytritol-xylitol systemet har funnits vara eutektiskt i ett delvis isomorft system, snarare än ett icke-isomorft system vilket har föreslagits tidigare litteratur. Dodekan-tridekan systemet bildar ett system med kongruent smältande fast lösning (idealisk som en PCM) vid en minimumtemperatur, till skillnad från tidigare litteratur som föreslagt en maximumtemperatur, eller ett eutektiskt system. Teoretisk modellering av fasjämvikt har också genomförts för att komplettera det experimentella fasdiagrammet för systemet erytritol-xylitol. Efter granskning av de metoder som använts tidigare i PCM-litteraturen har här valts ett generiskt tillvägagångssätt (CALPHAD-metoden). Denna generiska metod kan bedöma vilken typ av material och fasändring som helst, till skillnad från en tidigare använda metoder som är specifika för materialtyper eller kemiska egenskaper. Denna teoretiska studie bekräftar termodynamiskt solvus, solidus, eutektisk punkt och erytritol-xylitol fasdiagrammet i sin helhet. Vad gäller hållbarhetsaspekter med PCM-baserad TES, lyfter denna avhandling fokus på förnybara och kostnadseffektiva material (t.ex. polyoler och fetter) som PCM. Som exempel har här undersökts erytritol och olivolja, med förnybart ursprung. Erytritol skulle kunna bli ett kostnadseffektivt PCM (163 USD/kWh), om det produceras av glycerol vilket är en biprodukt från biodiesel/bioetanolframställning. Olivolja är ännu ett kostnadseffektivt material (144 USD/kWh), och som här har påvisats innehålla potentiella PCM sammansättningar med lämpliga fasändringsegenskaper för kylatillämpningar. En övergripande slutsats från denna avhandling är att det finns ett behov av att standardisera tekniker, metoder och transparent resultatrapportering när det gäller undersökningar av fasjämvikt och fasdiagram i PCM-sammanhang. Internationella samarbetsplattformar för TES är en väg att koordinera arbetet.
QC 20170830
Lamoureux, Alexandre. "Investigations of a closed-loop thermosyphon operating with slurries of a microencapsulated phase-change material." Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=110407.
Full textCette thèse présente des études numériques et expérimentales complémentaires d'écoulements laminaires et de transfert de chaleur en régime permanent au sein d'un thermosiphon à boucle fermée verticale opérant avec des suspensions de microcapsules d'un matériau à changement de phase (MCMCP) dispersées dans de l'eau distillée.Les MCMCP sont formées d'un matériau à changement de phase (MCP) encapsulé dans une enveloppe de résine polymérique. Leur diamètre équivalent est compris entre 0,5 μm et 12,5 μm et possède une valeur moyenne de 2,5 μm. Des études menées à l'aide d'un calorimètre différentiel à balayage (CDB) ont permis d'obtenir les données suivantes : lorsque soumis à un réchauffement continu à partir de l'état solide, la fusion du MCP s'amorce autour de 20,0 °C, se produit principalement entre 25,8 °C et 28,6 °C et se termine autour de 32,5 °C ; lorsqu'un refroidissement est entamé suite à une fusion complète, un abaissement de la température du MCP liquide à 18,1 °C est nécessaire afin d'amorcer la solidification qui se conclut alors à 15,0 °C ; si le refroidissement est entamé suite à une fusion partielle, le phénomène de surfusion décrit précédemment est absent ; finalement, la chaleur latente de fusion du MCP encapsulé est de 129,5 kJ/kg. Les données obtenues à l'aide du CDB ont permis d'évaluer la chaleur massique équivalente des MCMCP en fonction de la température lors d'un chauffage (fusion) et d'un refroidissement (solidification). La masse volumique équivalente des MCMCP fut aussi mesurée pour ces deux processus et le comportement rhéologique des MCMCP fut caractérisé comme étant non newtonien. Le matériel expérimental, les procédures, les résultats ainsi que les corrélations décrivant les propriétés équivalentes énumérées ci-haut (pour des températures allant de 5 °C à 55 °C) sont présentés. Un thermosiphon a été conçu, construit, instrumenté et utilisé afin de mener les expériences. Il est composé de deux tuyaux verticaux (diamètres interne et externe de 10,21 mm et 12,70 mm) faits d'acier inoxydable (316) et joints par deux coudes de 180° (rayon de courbure de 0.229 m) de sections transversales identiques. Un fil de nichrome recouvert d'une gaine isolante de Téflon embobiné autour d'une portion de la surface extérieure de l'un des tuyaux verticaux et ensuite chauffé à l'aide d'un courant électrique permit d'appliquer une condition aux limites s'apparentant à un flux thermique essentiellement constant (allant de 150 W/m^2 à 1850 W/m^2). Une portion de l'autre tuyau vertical a été refroidie à l'aide d'un échangeur de chaleur annulaire grâce auquel la température de sa paroi externe fut maintenue à 13 °C et 19.5 °C. Les surfaces externes des composants formant le thermosiphon ont été recouvertes d'un isolant. Des thermocouples étalonnés ont permis de mesurer la température de la surface externe de la section chauffante à de multiples endroits ainsi que la température de mélange à quatre emplacements de la boucle. Une procédure permettant de mesurer le débit massique des suspensions au sein du thermosiphon a été formulée et validée. Les études expérimentales ont été menées avec des suspensions ayant des concentrations massiques de 0% (eau distillée), 7.5%, 10%, 12.5%, 15% et 17.5%.Un modèle homogène a été proposé et utilisé lors des simulations d'écoulements et de transfert de chaleur en régime laminaire. Une méthode des éléments finis à volumes de contrôle a été formulée ainsi qu'améliorée avant d'être ultimement utilisée afin de résoudre les problèmes stationnaires et axisymétriques au sein des sections de chauffage et de refroidissement, où les effets de convection mixte sont significatifs. Une approche quasi unidimensionnelle, résolue à l'aide d'une méthode numérique segmentée, a été utilisée dans les autres sections du thermosiphon afin d'y résoudre les problèmes d'écoulements et de transfert de chaleur.Finalement, les résultats des simulations et des expériences sont présentés, comparés puis discutés.
Srinivas, V. S. S. "Topology Optimization Of Composite Heat-Sinks Involving Phase-Change Material." Thesis, 2008. http://hdl.handle.net/2005/816.
Full textWANG, CHIH-HUNG, and 王志宏. "A Study of Diatomite Composite Phase Change Materials." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/qmhkau.
Full text朝陽科技大學
應用化學系
106
In this study reports on the functionalization of recycled diatomite for preparing green and shape-stabilized phase change material (SSPCM); the SSPCM can be employed in Nylon to form thermo-regulating textiles. To avoid PCM leakage, PCM is adsorbed on diatomite with a stable structure. The purified diatomite(HD)adsorbs polyethylene glycol(PEG) by the straight dipping process for producing SSPCM. HD shows a high surface area of 58 m2g-1 and low organic impurity (<1%); the PEG/P-DT SSPCM exhibited high latent heat of 45 Jg-1 and low leakage (<0.2%). The thermal cycling test also showed excellent stability after 50 cycles. By adding SSPCM into the Nylon, the composite improved the 5% decomposition temperature (Td5) from 426.3oC to 442.1oC. The composite NCPCM7 exhibited impact and tensile strengths of 54.89 J/m and 45.95 MPa, respectively. The water absorption test results show that the addition of diatomite can increase the water absorption of the composite material. Moreover, NCPCM7 can reduce the temperature from 34.9 oC to 32.7 oC. Antibacterial test analysis, the antibacterial potential of the composite material reached more than 96%, with good antibacterial effect.