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Thermal storage performance of ground source heat pump–energy pile systems under intermittent and continuous operation in the Tibetan Plateau

Author

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  • Wang, Chenglong
  • Tang, Chenxi
  • Liu, Hanlong
  • Bouazza, Abdelmalek
  • Hu, Xiaochuan
  • Kong, Gangqiang

Abstract

This study evaluated the performance of a GSHP system with an energy pile (EP) in a high-altitude cold region through field testing and numerical simulation. Field experiments were conducted under continuous operation (H-24) and intermittent operation (12 h on/12 h off), and a three-dimensional finite element model was developed to simulate additional intermittent cycles and inlet water temperature conditions. The results show that intermittent operation significantly enhances both the average daily thermal storage capacity of the system and the heat exchange efficiency of the EP compared with continuous operation, with shorter intervals providing greater benefits. Under continuous operation, the energy efficiency ratio (EER) declines rapidly at the start and then stabilizes, whereas in intermittent operation the EER partially recovers after each shutdown, yielding an overall improvement. However, as inlet water temperature increases, the relative advantage of intermittent operation decreases for both thermal storage and heat exchange efficiency, while the EER shows a marked downward trend.

Suggested Citation

  • Wang, Chenglong & Tang, Chenxi & Liu, Hanlong & Bouazza, Abdelmalek & Hu, Xiaochuan & Kong, Gangqiang, 2025. "Thermal storage performance of ground source heat pump–energy pile systems under intermittent and continuous operation in the Tibetan Plateau," Energy, Elsevier, vol. 340(C).
    • Handle: RePEc:eee:energy:v:340:y:2025:i:c:s0360544225047334
    DOI: 10.1016/j.energy.2025.139091
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