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A novel coupled ground heat exchange system: Numerical investigation on heat and moisture transfer characteristics

Author

Listed:
  • Liu, Yajiao
  • Lv, Yuzheng
  • Li, Tao
  • Dai, Xiaosen
  • Zhang, Yuxiao
  • Zhao, Yu
  • Liu, Li
  • Luo, Hao

Abstract

The individual helix ground heat exchanger (HGHE) has a serious thermal interference effect, which seriously affects the heat exchange efficiency. In order to improve the heat transfer performance of HGHE effectually, a novel “LID + HGHE” system was proposed in this paper combining low impact development technology (LID). The corresponding numerical investigation was conducted based on the theory of saturation-unsaturated heat coupled moisture transfer in shallow soil. And three different ground types were simulated and compared through the heat exchange characteristics, temperature distribution and water content distribution of soil. The results indicate that rainwater infiltration for the sunken green ground has more significant effect on alleviating the thermal interference compared with the mudstone ground. Due to the larger soil infiltration coefficient and wider range of rainwater infiltration for sunken green ground, the decrease of water content near the HGHE has been effectively alleviated. The whole pipe of the exchanger in the “LID + HGHE” system can be divided into three stages. The heat flux in three stages is promoted by 36.7 %, 20.2 % and 9.2 % respectively compared with that of mudstone ground type. Thus, the overall heat flux of HGHE for the sunken green ground type is 21.3 % higher than that of the mudstone ground type. The novel “LID + HGHE” system can be used as a priority for the sake of higher efficiency of ground source heat pump in actual engineering projects.

Suggested Citation

  • Liu, Yajiao & Lv, Yuzheng & Li, Tao & Dai, Xiaosen & Zhang, Yuxiao & Zhao, Yu & Liu, Li & Luo, Hao, 2026. "A novel coupled ground heat exchange system: Numerical investigation on heat and moisture transfer characteristics," Renewable Energy, Elsevier, vol. 256(PH).
    • Handle: RePEc:eee:renene:v:256:y:2026:i:ph:s0960148125022748
    DOI: 10.1016/j.renene.2025.124610
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