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Influence of backfilling phase change material on thermal performance of precast high-strength concrete energy pile

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  • Cao, Ziming
  • Zhang, Guozhu
  • Liu, Yiping
  • Zhao, Xu
  • Li, Chenglin

Abstract

The use of phase change materials (PCMs) within the precast high-strength concrete (PHC) energy pile is relatively rare. A study concerning the thermal performance of the PHC energy pile backfilled with PCMs were performed to compare with conventional backfill materials. Field tests of the PHC energy pile were conducted. Then, different types of heat transfer numerical models for the PHC energy pile backfilled with water, ordinary grout, and PCMs were established, and the validities of models were confirmed by the field test data and other published studies. The following results are obtained from this study: (1) the thermal performances of the PHC energy pile backfilled with ordinary grout and PCM-type backfill materials (i.e., PCM, enhanced-PCM, and enhanced-PCM-1) are significantly greater than that backfilled with water under continuous operation; (2) intermittent operation has a larger influence on the heat exchange rate of PCM-type backfilled PHC energy pile than ordinary grout backfill material, and enhanced-PCM and enhanced-PCM-1 backfill materials generate higher heat exchange rates for the PHC energy pile than the ordinary grout under intermittent operation; (3) enhancements in the thermal properties of PCMs and intermittent operation both are important to improve the heat transfer performance of the PHC energy pile backfilled with PCMs, and the lower melting temperature of PCMs helps to enhance the thermal performance of PCM-type backfilled PHC energy pile in the cooling mode; and (4) under higher velocity of groundwater flow, ordinary grout backfill material is more suitable for the PHC energy pile compared with PCM-type backfill materials.

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  • Cao, Ziming & Zhang, Guozhu & Liu, Yiping & Zhao, Xu & Li, Chenglin, 2022. "Influence of backfilling phase change material on thermal performance of precast high-strength concrete energy pile," Renewable Energy, Elsevier, vol. 184(C), pages 374-390.
    • Handle: RePEc:eee:renene:v:184:y:2022:i:c:p:374-390
    DOI: 10.1016/j.renene.2021.11.100
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    1. Cardoso de Freitas Murari, Milena & de Hollanda Cavalcanti Tsuha, Cristina & Loveridge, Fleur, 2022. "Investigation on the thermal response of steel pipe energy piles with different backfill materials," Renewable Energy, Elsevier, vol. 199(C), pages 44-61.
    2. Zhang, Guozhu & Cao, Ziming & Xiao, Suguang & Guo, Yimu & Li, Chenglin, 2022. "A promising technology of cold energy storage using phase change materials to cool tunnels with geothermal hazards," Renewable and Sustainable Energy Reviews, Elsevier, vol. 163(C).
    3. Ma, Qijie & Fan, Jianhua & Liu, Hantao, 2023. "Energy pile-based ground source heat pump system with seasonal solar energy storage," Renewable Energy, Elsevier, vol. 206(C), pages 1132-1146.
    4. Ai, Zhi Yong & Ye, Jia Ming, 2023. "Thermo-mechanical analysis of pipe energy piles in layered cross-isotropic soils," Energy, Elsevier, vol. 277(C).

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