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Simulation Analysis on the Heat Performance of Deep Borehole Heat Exchangers in Medium-Depth Geothermal Heat Pump Systems

Author

Listed:
  • Jiewen Deng

    (Department of Building Science, Tsinghua University, Beijing 100084, China)

  • Qingpeng Wei

    (Department of Building Science, Tsinghua University, Beijing 100084, China)

  • Shi He

    (Department of Building Science, Tsinghua University, Beijing 100084, China)

  • Mei Liang

    (Department of Building Science, Tsinghua University, Beijing 100084, China)

  • Hui Zhang

    (Department of Building Science, Tsinghua University, Beijing 100084, China)

Abstract

Deep borehole heat exchangers (DBHEs) extract heat from the medium-depth geothermal energy with the depth of 2–3 km and provide high-temperature heat source for the medium-depth geothermal heat pump systems (MD-GHPs). This paper focuses on the heat transfer performance of DBHEs, where field tests and simulation are conducted to analyze the heat transfer process and the influence factors. Results identify that the heat transfer performance is greatly influenced by geothermal properties of the ground, thermal properties and depth of DBHEs and operation parameters, which could be classified into external factors, internal factors and synergic adjustment. In addition, the long-term operation effects are analyzed with the simulation, results show that with inlet water temperature setting at 20 °C and flow rate setting at 6.0 kg/s, the average outlet water temperature only drops 0.99 °C and the average heat extraction drops 9.5% after 20-years operation. Therefore, it demonstrates that the medium-depth geothermal energy can serve as the high-temperature heat source for heat pump systems stably and reliably. The results from this study can be potentially used to guide the system design and optimization of DBHEs.

Suggested Citation

  • Jiewen Deng & Qingpeng Wei & Shi He & Mei Liang & Hui Zhang, 2020. "Simulation Analysis on the Heat Performance of Deep Borehole Heat Exchangers in Medium-Depth Geothermal Heat Pump Systems," Energies, MDPI, vol. 13(3), pages 1-28, February.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:3:p:754-:d:318304
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    References listed on IDEAS

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    Cited by:

    1. Luo, Yongqiang & Xu, Guozhi & Zhang, Shicong & Cheng, Nan & Tian, Zhiyong & Yu, Jinghua, 2022. "Heat extraction and recover of deep borehole heat exchanger: Negotiating with intermittent operation mode under complex geological conditions," Energy, Elsevier, vol. 241(C).
    2. huajun, Wang & Yishuo, Xu & Yukun, Sun & Sumin, Zhao, 2022. "Heat extraction by deep coaxial borehole heat exchanger for clean space heating near Beijing, China: Field test, model comparison and operation pattern evaluation," Renewable Energy, Elsevier, vol. 199(C), pages 803-815.
    3. Zhendi Ma & Siyu Qin & Yuping Zhang & Wei-Hsin Chen & Guosheng Jia & Chonghua Cheng & Liwen Jin, 2023. "Effects of Boundary Conditions on Performance Prediction of Deep-Buried Ground Heat Exchangers for Geothermal Energy Utilization," Energies, MDPI, vol. 16(13), pages 1-27, June.
    4. Deng, Jiewen & Peng, Chenwei & Su, Yangyang & Qiang, Wenbo & Cai, Wanlong & Wei, Qingpeng, 2023. "Research on the heat storage characteristic of deep borehole heat exchangers under intermittent operation mode: Simulation analysis and comparative study," Energy, Elsevier, vol. 282(C).
    5. Isa Kolo & Christopher S. Brown & Gioia Falcone & David Banks, 2023. "Repurposing a Geothermal Exploration Well as a Deep Borehole Heat Exchanger: Understanding Long-Term Effects of Lithological Layering, Flow Direction, and Circulation Flow Rate," Sustainability, MDPI, vol. 15(5), pages 1-24, February.
    6. Luka Boban & Dino Miše & Stjepan Herceg & Vladimir Soldo, 2021. "Application and Design Aspects of Ground Heat Exchangers," Energies, MDPI, vol. 14(8), pages 1-31, April.
    7. Jia, G.S. & Ma, Z.D. & Xia, Z.H. & Zhang, Y.P. & Xue, Y.Z. & Chai, J.C. & Jin, L.W., 2022. "A finite-volume method for full-scale simulations of coaxial borehole heat exchangers with different structural parameters, geological and operating conditions," Renewable Energy, Elsevier, vol. 182(C), pages 296-313.
    8. Kexun Wang & Tishi Huang & Wenke Zhang & Zhiqiang Zhang & Xueqing Ma & Leyao Zhang, 2023. "An Analysis of the Heat Transfer Characteristics of Medium-Shallow Borehole Ground Heat Exchangers with Various Working Fluids," Sustainability, MDPI, vol. 15(16), pages 1-21, August.

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