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Heat Storage/Heat Release of Phase-Change Filling body with Casing Heat Exchanger for Extracting Geothermal Energy

Journal of Thermal Science 2023年第3期32卷 1171-1189页

作者： ZHANG Xiaoyan XU Muyan LIU Lang YANG Qixing KI-IL Song Energy School Xi'an University of Science and TechnologyXi'an 710054China Key Laboratory of Western Mines and Hazards Prevention Ministry of Education of ChinaXi'an 710054China Department of Civil Engineering Inha UniversityIncheon 402-751South Korea

Arranging heat exchanger in filling body to extract geothermal energy is an effective way to alleviate the problems of high ground pressure and high ground temperature in deep resource *** body with casing heat exchanger was acted as research object,encapsulating phase change materials(PCMs)in annular *** heat storage and heat release process,the effects of different PCMs on temperature distribution,phase-change process and heat transfer performance were *** result indicates:During heat storage process,the temperature increases rapidly and the melting process is accelerated for the position closer surrounding ***_(2)·6H_(2)O/EG can make filling body complete heat storage process in the shortest time because of its good thermal *** heat storage capacity of PCMs backfill is significantly higher than that of ordinary backfill;it increases by 36.6%-67.3%at heat storage of 10 *** heat release process,the closer to the heat exchange tube,the greater the temperature drop in filling *** maximum value of heat release rate and heat release capacity is in CaCl_(2)·6H_(2)O/EG backfill,it can release 116.4%more heat than RT35backfill after heat release of 12 h,the maximum value of effectiveness and its heat transfer rate also is in CaCl_(2)·6H_(2)O/EG *** paper provides the basic data for the selection of PCMs in phase-change thermal storage filling body.

关键词： flling body heat exchanger phase change material heat storage/heat release

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