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Phase change materials (PCMs) can provide high storage densities by exploiting latent heat during melting and solidification. Despite strong research interest, real-world PCM TES implementations remain rare. This thesis investigates PCM TES at material, device, and system scale using an office-building case study for daily cold-energy peak shaving.",{"@graph":69,"@context":121},[70,84,104],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":40,"@type":76,"position":81},"https://docshare.wps.com/document/research-report/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/design-of-thermal-energy-storage-with-phase-change-materials-thesis-phase-change-materials/664691/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":98,"encodingFormat":97,"isAccessibleForFree":99,"interactionStatistic":100},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/design-of-thermal-energy-storage-with-phase-change-materials-thesis-phase-change-materials/664691.png","ImageObject",300,407,{"name":92,"@type":93},"Guten Appetit_Joghurt","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-29",true,{"@type":101,"interactionType":102,"userInteractionCount":14},"InteractionCounter",{"@type":103},"ViewAction",{"@type":105,"mainEntity":106},"FAQPage",[107,113,117],{"name":108,"@type":109,"acceptedAnswer":110},"What is the main purpose of thermal energy storage (TES) in this thesis?","Question",{"text":111,"@type":112},"TES is added to a process so thermal energy can be stored and released on demand, enabling greater flexibility and shifting energy demand away from peak periods.","Answer",{"name":114,"@type":109,"acceptedAnswer":115},"What does the thesis conclude at the material scale about the T-History method?",{"text":116,"@type":112},"The current mathematical model shows systematic errors and the method is sensitive to experimental parameters. A more robust data-evaluation approach is proposed to handle noisy data when computing the first time derivative.",{"name":118,"@type":109,"acceptedAnswer":119},"What problem is observed in the device-scale PCM TES cycling experiments?",{"text":120,"@type":112},"Continued cycling leads to phase separation of the PCM (salt-hydrate), reducing storage capacity. The thesis indicates phase separation can be reset but should be prevented when scaling up.","https://schema.org",{"og:url":83,"og:type":123,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":125,"canonical":83},"index,follow",{"doc_id":127,"site_id":62},664691,1793267075,{"code":4,"msg":5,"data":130},{"doc_id":127,"user_id":131,"nickname":92,"user_avatar":132,"doc_module":4,"category_id":39,"category_name":40,"doc_title":65,"doc_description":67,"doc_content":133,"file_id":134,"file_url":135,"file_type":136,"file_size":137,"view_count":14,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":138,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":128,"read_time":143},1374408768420,"https://ap-avatar.wpscdn.com/davatar_6f874abed73319feea01a86fa6f0fab8","Thesis for the degree of Doctor of Philosophy  \nDesign of Thermal Energy Storage with Phase  \nChange Materials  \nInvestigations within Material, Device and System Scale  \nPepe Tan  \nDepartment of Architecture and Civil Engineering Division of Building Technology  \nCHALMERS UNIVERSITY OF TECHNOLOGY Göteborg, Sweden 2020  \nDesign of Thermal Energy Storage with Phase Change Materials Investigations within Material, Device and System Scale  \nPepe Tan  \nISBN 978-91-7905-304-8  \n© Pepe Tan, 2020 .  \nDoktorsavhandlingar vid Chalmers tekniska högskola Ny serie nr 4771  \nISSN 0346-718X  \nDepartment of Architecture and Civil Engineering Division of Building Technology  \nChalmers University of Technology SE–412 96 Göteborg, Sweden Telephone + 46 (0) 31 – 772 1000  \nTypeset by the author using LATEX.  \nPrinted by Chalmers Reproservice Göteborg, Sweden 2020  \nEverything has three sides the one I see,  \nthe one you see,  \nand the one nobody of us yet sees .(A quote from an unknown source)  \nAbstract  \nThe addition of a thermal energy storage (TES) into a process allows the operator to store and release thermal energy on demand. This increased process flexibility leads to potential benefits such as shifting energy demand from peak to off-peak hours. In particular, socalled phase change materials (PCMs) have the potential to achieve high storage densities, when their latent heat of melting and solidification can be utilized. However, despite a high research interest in PCMs over the last years, real life implementations of PCM TES are still uncommon. This thesis presents work done on material, device and system scale based on a case study for daily peak shaving of cold energy in an office building using a PCM TES.  \nOn material scale, the T-History method for thermal analysis of PCM samples has been studied with both numerical and experimental methods. It is shown that the current mathematical model is subject to systematic errors which should be corrected in the future. Moreover, the results of the method are shown to be sensitive to a number of different experimental parameters and their trade-offs are discussed. A new data evaluation method, which is more robust to noisy data when forming the first time derivative of the temperature measurements, is proposed in order to achieve a better trade-off between precision and accuracy of the results. The work can be seen as a contribution to the necessary standardization of the method in future work.  \nOn device scale, an experimental test setup has been built to study a commercially available PCM TES design with a salt-hydrate as storage material. The test setup is used to cycle the storage under actual process conditions. The results show that the storage suffered from phase separation of the PCM with continued cycling, which causes the storage capacity to decrease. Sample analysis using the T-History method reveals that supercooling behavior, phase change temperature and storage capacity systematically changes across the vertical height of the storage before and after cycling. While it is shown that the phase separation can be reset, phase separation needs to be prevented when the storage is scaled up.  \nA techno-economic analysis on system scale is then performed for an actual real-scale installation of the PCM TES in a new office building. First benchmarking shows that the storage capacity is stable but does not reach manufacturer specifications. Future work needs to determine the reasons behind the performance decrease, such as looking into the role of a superabsorbent polymer that has been mixed with the salt-hydrate to prevent phase separation. The PCM TES can nevertheless be used for daily peak shaving. A mixed integer linear programming (MILP) model is used to optimize the storage discharging schedule for a simulated yearly cooling load of the building. The estimated economic benefits are translated into an investment cost limit for a five year payback time. Since the current storage investment costs ar","cbCaijyxRSftFYXO","https://ap.wps.com/l/cbCaijyxRSftFYXO","pdf",20210141,93,"English","# Abstract\n## Material scale\n## Device scale\n## System scale\n## Keywords\n## Acknowledgments","[{\"question\":\"What is the main purpose of thermal energy storage (TES) in this thesis?\",\"answer\":\"TES is added to a process so thermal energy can be stored and released on demand, enabling greater flexibility and shifting energy demand away from peak periods.\"},{\"question\":\"What does the thesis conclude at the material scale about the T-History method?\",\"answer\":\"The current mathematical model shows systematic errors and the method is sensitive to experimental parameters. A more robust data-evaluation approach is proposed to handle noisy data when computing the first time derivative.\"},{\"question\":\"What problem is observed in the device-scale PCM TES cycling experiments?\",\"answer\":\"Continued cycling leads to phase separation of the PCM (salt-hydrate), reducing storage capacity. The thesis indicates phase separation can be reset but should be prevented when scaling up.\"}]","Design of Thermal Energy Storage with Phase Change Materials - Thesis - Phase Change Materials | PDF",234]