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Study on heat-exchange efficiency and energy efficiency ratio of a deeply buried pipe energy pile group considering seepage and circulating-medium flow rate

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  • Chen, Zhi
  • Lian, Xingwei
  • Tan, Jinjia
  • Xiao, Henglin
  • Ma, Qiang
  • Zhuang, Yan

Abstract

Seepage and circulating-medium flow rate are both primary factors affecting the heat-exchange efficiency and energy efficiency ratio of underground energy structures. In this study, a thermal-seepage coupled model of a deeply buried pipe energy pile group is developed, and the effects of circulating-medium flow rate, seepage velocity, and thermal migration caused by seepage on heat-exchange efficiency and energy efficiency ratio are analyzed. The results show that increasing the circulating-medium flow rate can improve heat-exchange efficiency, but aggravate heat accumulation, resulting in energy efficiency ratio reduction. Seepage can eliminate the heat accumulation as well as improve the heat-exchange efficiency and energy efficiency ratio. The heat accumulated around upstream piles will migrate along the seepage direction, generating thermal disturbance to the downstream piles. An increase in the circulating-medium flow rate of upstream deeply buried pipe energy piles will aggravate thermal disturbance. This phenomenon is slightly retarded if seepage velocity is increased. Additionally, when the circulating-medium flow rate of the deeply buried pipe energy pile group under seepage is within the optimal range, slightly reducing the circulating-medium flow rate of the upstream deeply buried pipe energy piles can reduce thermal disturbance to the downstream piles without affecting the overall heat-exchange efficiency.

Suggested Citation

  • Chen, Zhi & Lian, Xingwei & Tan, Jinjia & Xiao, Henglin & Ma, Qiang & Zhuang, Yan, 2023. "Study on heat-exchange efficiency and energy efficiency ratio of a deeply buried pipe energy pile group considering seepage and circulating-medium flow rate," Renewable Energy, Elsevier, vol. 216(C).
    • Handle: RePEc:eee:renene:v:216:y:2023:i:c:s0960148123009345
    DOI: 10.1016/j.renene.2023.119020
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    References listed on IDEAS

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    1. Xia, Zhenhua & Jia, Guosheng & Tao, Zeyu & Jia, Wei & Shi, Yishu & Jin, Liwen, 2024. "Multi-objective optimization of geothermal heating systems based on thermal economy and environmental impact evaluation," Renewable Energy, Elsevier, vol. 237(PD).
    2. Yang, Weibo & Rao, Zhiyong & Qiang, Yuhan & Wang, Feng, 2025. "Investigations on thermo-mechanical coupling behaviours of energy pile group under groundwater seepage," Energy, Elsevier, vol. 330(C).
    3. Zhao, Zilong & Lv, Guoquan & Xu, Yanwen & Lin, Yu-Feng & Wang, Pingfeng & Wang, Xinlei, 2024. "Enhancing ground source heat pump system design optimization: A stochastic model incorporating transient geological factors and decision variables," Renewable Energy, Elsevier, vol. 225(C).
    4. You, Tian & Yan, Tongrui & Huang, Yiyu & Huang, Shuai & Cui, Hongzhi, 2025. "Thermo-mechanical coupling performance analysis of phase change material and nanofluid synergized high-efficiency energy piles for shallow geothermal energy utilization," Energy, Elsevier, vol. 334(C).
    5. Jianlong Shi & Wei Zhang & Mingjian Wang & Chunguang Wang & Zhengnan Wei & Dong Wang & Peng Zheng, 2023. "Heat Transfer Mechanism of Heat–Cold Alternate Extraction in a Shallow Geothermal Buried Pipe System under Multiple Heat Exchanger Groups," Energies, MDPI, vol. 16(24), pages 1-23, December.
    6. Xianglin Liu & Yuhan Tian & Yongli Liu & Wen Liu & Lifei Zheng & Xiaoqing Li, 2025. "Efficient Development and Utilization of Geothermal Energy: An Analysis of the Operational Strategy for Deep-Buried Pipe-Type Energy Piles Considering Seepage Effects," Sustainability, MDPI, vol. 17(4), pages 1-21, February.

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