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How to improve the energy performance of mid-deep geothermal heat pump systems: Optimization of heat pump, system configuration and control strategy

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Listed:
  • Deng, Jiewen
  • Su, Yangyang
  • Peng, Chenwei
  • Qiang, Wenbo
  • Cai, Wanlong
  • Wei, Qingpeng
  • Zhang, Hui

Abstract

Mid-deep borehole heat exchangers (MDBHEs) extract heat from geothermal energy with depth of 2–3 km, and provide high-temperature heat source for heat pump heating system. To improve the energy performance, this paper conducted optimization analysis on heat pump, system configuration and control strategy. Firstly, the energy efficiency and regulation characteristic of magnetic bearing variable-speed centrifugal heat pump (MBC-HP) was examined through field tests and simulation analysis. Results showed that MBC-HP performed efficiently with wide-range variation of heating load and compression ratio. And average COP of MBC-HP reached 6.21 during heating season. Besides, as evaporator-side water temperature difference (dTe) reached about 10 °C, two-stage MBC-HPs connected in series was raised to fit the large dTe, and the average COP of heat pump was improved to 6.97. Furthermore, the evaporator-side water flow rate (Ge) affected the energy efficiency of heat pump system and heat transfer performance of MDBHEs significantly. Thus the water pumps were recommended to be connected in parallel and then connected with heat pumps. Then the numbers and frequency of water pumps should be regulated to maintain dTe about 9.0 °C. Compared with control strategy of constant Ge, the COPs of heat pump system increased to 5.28, showing 18.7 % improvement.

Suggested Citation

  • Deng, Jiewen & Su, Yangyang & Peng, Chenwei & Qiang, Wenbo & Cai, Wanlong & Wei, Qingpeng & Zhang, Hui, 2023. "How to improve the energy performance of mid-deep geothermal heat pump systems: Optimization of heat pump, system configuration and control strategy," Energy, Elsevier, vol. 285(C).
    • Handle: RePEc:eee:energy:v:285:y:2023:i:c:s0360544223029316
    DOI: 10.1016/j.energy.2023.129537
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    References listed on IDEAS

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    1. 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.
    2. Cai, Wanlong & Wang, Fenghao & Chen, Shuang & Chen, Chaofan & Liu, Jun & Deng, Jiewen & Kolditz, Olaf & Shao, Haibing, 2021. "Analysis of heat extraction performance and long-term sustainability for multiple deep borehole heat exchanger array: A project-based study," Applied Energy, Elsevier, vol. 289(C).
    3. Huashan Li & Sihao Huang & Xianbiao Bu & Lingbao Wang, 2021. "Analysis of deep borehole heat exchanger with horizontal branch wells for building heating [A thorough assessment of China’s standard for energy consumption of buildings]," International Journal of Low-Carbon Technologies, Oxford University Press, vol. 16(4), pages 1164-1169.
    4. Dai, Chuanshan & Li, Jiashu & Shi, Yu & Zeng, Long & Lei, Haiyan, 2019. "An experiment on heat extraction from a deep geothermal well using a downhole coaxial open loop design," Applied Energy, Elsevier, vol. 252(C), pages 1-1.
    5. Luo, Yongqaing & Guo, Hongshan & Meggers, Forrest & Zhang, Ling, 2019. "Deep coaxial borehole heat exchanger: Analytical modeling and thermal analysis," Energy, Elsevier, vol. 185(C), pages 1298-1313.
    6. Deng, Jiewen & Wei, Qingpeng & Qian, Yangyang & Zhang, Hui, 2018. "Does magnetic bearing variable-speed centrifugal chiller perform truly energy efficient in buildings: Field-test and simulation results," Applied Energy, Elsevier, vol. 229(C), pages 998-1009.
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