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Field tests on thermal response characteristics of micro-steel-pipe pile under multiple temperature cycles

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  • Ren, Lian-wei
  • Xu, Jian
  • Kong, Gang-qiang
  • Liu, Han-long

Abstract

Energy piles have dual function of supporting a superstructure and acting as a shallow geothermal heat exchanger. Field tests on the thermal response characteristics of micro-steel-pipe piles under five operating temperature conditions (summer intermittent: 12 h for heating and 12 h for stopping as a cycle, winter intermittent: 12 h for cooling and 12 h for stopping as a cycle, summer continuous, recovery and winter continuous) were conducted. The heat transfer efficiency, the coefficient of performance (COP), the temperature and thermal induced stress of micro-steel-pipe piles were measured and analyzed. The results indicated that values of the heat transfer efficiency and COP were decreased with the process of cycles. The average COP and the average heat exchange rate per unit length under summer intermittent condition were relative higher than those in the corresponding period under summer continuous condition (the same trend in winter). The heat transfer efficiency in winter conditions was relative lower than that in summer conditions. In this field test condition, the additional compressive stress in micro-steel-pipe piles was increased by 200 kPa/°C, and the average heat exchange rate per metre was −49 W/m under Condition 5, 95 W/m under Condition 3.

Suggested Citation

  • Ren, Lian-wei & Xu, Jian & Kong, Gang-qiang & Liu, Han-long, 2020. "Field tests on thermal response characteristics of micro-steel-pipe pile under multiple temperature cycles," Renewable Energy, Elsevier, vol. 147(P1), pages 1098-1106.
    • Handle: RePEc:eee:renene:v:147:y:2020:i:p1:p:1098-1106
    DOI: 10.1016/j.renene.2019.09.084
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    References listed on IDEAS

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    1. Park, Sangwoo & Lee, Dongseop & Choi, Hyun-Jun & Jung, Kyoungsik & Choi, Hangseok, 2015. "Relative constructability and thermal performance of cast-in-place concrete energy pile: Coil-type GHEX (ground heat exchanger)," Energy, Elsevier, vol. 81(C), pages 56-66.
    2. Suryatriyastuti, M.E. & Mroueh, H. & Burlon, S., 2012. "Understanding the temperature-induced mechanical behaviour of energy pile foundations," Renewable and Sustainable Energy Reviews, Elsevier, vol. 16(5), pages 3344-3354.
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    Cited by:

    1. Ding, Xuanming & Peng, Chen & Wang, Chenglong & Kong, Gangqiang, 2022. "Heat transfer performance of energy piles in seasonally frozen soil areas," Renewable Energy, Elsevier, vol. 190(C), pages 903-918.
    2. Yang, Weibo & Sun, Taofu & Zhang, Chaoyang & Wang, Feng, 2023. "Experimental and numerical investigations of thermo-mechanical behaviour of energy pile under cyclic temperature loads," Energy, Elsevier, vol. 267(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. 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.
    5. 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.

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