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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

Author

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  • Tingting Luo

    (College of Mining, Guizhou University, Guiyang 550025, China
    College of Materials and Metallurgy, Guiyang 550025, China)

  • Peng Pei

    (College of Mining, Guizhou University, Guiyang 550025, China)

  • Jianan Wu

    (College of Mining, Guizhou University, Guiyang 550025, China)

  • Chen Wang

    (College of Mining, Guizhou University, Guiyang 550025, China)

  • Long Tang

    (School of Mines, China University of Mining and Technology, Xuzhou 221116, China)

Abstract

Shallow geothermal energy is a clean and effective form of energy that can overcome the problems associated with the depletion of carbon-based energy carbon emissions. Due to the special hydrogeological conditions in karst regions, the heat transfer between heat exchange boreholes and the ground formation is a complicated, multi-physical process. The abundant groundwater flow plays an important role in the heat transfer process, and even presents an opportunity to mitigate the heat imbalance during the long term operation of ground-coupled heat pumps (GCHP). In this study, both laboratorial experiments and numerical simulations were performed to analyze the mechanism that shows how fracture water impacts on heat capacity and the thermal imbalance of the energy storage rock mass. The results showed that the overall temperature fluctuation of the rock mass was reduced by the fracture water, and the temperature curve with time became gentler, which means in practice that the heat imbalance in the rock mass could be delayed. However, the temperature contour map showed that the impact of the fracture water flow was constrained in the nearby areas and decreased obviously with distance. The temperature field was also dragged along the direction of the fracture water flow. During the shutdown period, the fracture water significantly enhanced the thermal recovery ability of the rock mass. The results will assist in further understanding the mechanism of heat transfer and energy balance in a rock mass with fracture water flow. It is proposed that the U pipes should be located at zones with abundant fracture water if the construction condition permits. U pipes that are near the fractures should share more of the load or a denser layout could be possible as their heat transfer capacity is improved by the water flow.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:17:p:6385-:d:903840
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    References listed on IDEAS

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    1. 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.
    2. Zhao, Zilong & Lin, Yu-Feng & Stumpf, Andrew & Wang, Xinlei, 2022. "Assessing impacts of groundwater on geothermal heat exchangers: A review of methodology and modeling," Renewable Energy, Elsevier, vol. 190(C), pages 121-147.
    3. 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.
    4. You, Tian & Wu, Wei & Shi, Wenxing & Wang, Baolong & Li, Xianting, 2016. "An overview of the problems and solutions of soil thermal imbalance of ground-coupled heat pumps in cold regions," Applied Energy, Elsevier, vol. 177(C), pages 515-536.
    5. Luo, Jin & Wang, Haiqi & Zhang, Haiyong & Yan, Zezhou, 2021. "A geospatial assessment of the installation potential of shallow geothermal systems in a graben basin," Renewable Energy, Elsevier, vol. 165(P1), pages 553-564.
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    Cited by:

    1. Peng Pei & Faqiang Su, 2023. "Energy Geotechnics and Geostructures," Energies, MDPI, vol. 16(8), pages 1-3, April.

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