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A Numerical Study on the Performance of Ground Heat Exchanger Buried in Fractured Rock Bodies

Author

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  • Weisong Zhou

    (College of Mines, Guizhou University, Huaxi District, Guiyang 550025, China)

  • Peng Pei

    (College of Mines, Guizhou University, Huaxi District, Guiyang 550025, China)

  • Dingyi Hao

    (Key Laboratory of Deep Coal Resource Mining, China University of Mining and Technology, Xuzhou 221116, China)

  • Chen Wang

    (College of Mines, Guizhou University, Huaxi District, Guiyang 550025, China)

Abstract

The ground source heat pump (GSHP) is receiving increasing attention due to the global trend of energy-saving and emission reduction. However, projects with ground heat exchangers (GHEs) buried in fractured rock bodies are scarce, and the impacts of water flow in fractures on the system performance are short of detailed investigations. In this paper, a three-dimensional model was built to study the temperature distribution underground and the relative performance of heat pumps and GHEs influenced by groundwater flow in fractures. Three factors including fluid flow velocities in fractures, the number of fractures and the distributions of fractures were taken into consideration, a range of indicators including outlet temperature of GHEs, mean temperature of “Energy Storage Rock Body” (ESRB) and heat injection rate per unit length were examined. It was found that the heat injection rate per unit length of a U-pipe in fractured rock body could be up to 78.83% higher than that of a U-pipe in integrated rock. Likewise, the coefficient of performance of cases with fractures was identified to be up to 4.50% higher than the integrated rock case. In addition, differently distributed fractures also have different impacts on the heat transfer efficiency of heat pumps and GHEs.

Suggested Citation

  • Weisong Zhou & Peng Pei & Dingyi Hao & Chen Wang, 2020. "A Numerical Study on the Performance of Ground Heat Exchanger Buried in Fractured Rock Bodies," Energies, MDPI, vol. 13(7), pages 1-17, April.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:7:p:1647-:d:340514
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    References listed on IDEAS

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    Cited by:

    1. Tingting Luo & Peng Pei & Jianan Wu & Chen Wang & Long Tang, 2022. "Research on the Application of Fracture Water to Mitigate the Thermal Imbalance of a Rock Mass Associated with the Operation of Ground-Coupled Heat Pumps," Energies, MDPI, vol. 15(17), pages 1-13, September.
    2. Tingting Luo & Peng Pei & Yixia Chen & Dingyi Hao & Chen Wang, 2022. "Improvements in the Water Retention Characteristics and Thermophysical Parameters of Backfill Material in Ground Source Heat Pumps by a Molecular Sieve," Energies, MDPI, vol. 15(5), pages 1-15, February.
    3. Aneta Sapińska-Śliwa & Tomasz Sliwa & Kazimierz Twardowski & Krzysztof Szymski & Andrzej Gonet & Paweł Żuk, 2020. "Method of Averaging the Effective Thermal Conductivity Based on Thermal Response Tests of Borehole Heat Exchangers," Energies, MDPI, vol. 13(14), pages 1-20, July.
    4. Hang Zou & Peng Pei & Chen Wang & Dingyi Hao, 2021. "A numerical study on heat transfer performances of horizontal ground heat exchangers in ground-source heat pumps," PLOS ONE, Public Library of Science, vol. 16(5), pages 1-19, May.

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