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Thermal Performance Analysis and Multi-Factor Optimization of Middle–Deep Coaxial Borehole Heat Exchanger System for Low-Carbon Building Heating

Author

Listed:
  • Mingshan Liang

    (Hubei Electric Power Planning and Design Institute Co., Ltd., Wuhan 430040, China)

  • Jianhua Tu

    (Hubei Electric Power Planning and Design Institute Co., Ltd., Wuhan 430040, China)

  • Lingwen Zeng

    (Hubei Electric Power Planning and Design Institute Co., Ltd., Wuhan 430040, China)

  • Zhaoqing Zhang

    (Hubei Electric Power Planning and Design Institute Co., Ltd., Wuhan 430040, China)

  • Nan Cheng

    (School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China)

  • Yongqiang Luo

    (School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China)

Abstract

Ground-source heat pumps with deep borehole heat exchangers can fully utilize deep geothermal energy, effectively reducing the consumption of non-renewable energy for building air conditioning and achieving energy conservation and emissions reduction goals. However, the middle–deep coaxial borehole heat exchange (MDBHE) development is insufficient, and there is currently a lack of definitive guidelines for system optimal design and operation. This paper firstly establishes an effective and efficient system model and examines nine important parameters related to the design and operation of the MDBHE using a single-factor analysis. Thereafter, we compare and analyze the impact of different parameters through an orthogonal experimentation method. The findings reveal that the three most significant factors are borehole depth, inlet temperature, and mass flow rate, in descending order of importance. In addition, in terms of operation mode, this paper makes a comparative analysis of the operation of the MDBHE in variable flow mode and constant flow mode. The results showed that the average energy consumption of the pump in the variable flow mode decreased by 9.6%, and the surrounding ground temperature recovered at a faster rate.

Suggested Citation

  • Mingshan Liang & Jianhua Tu & Lingwen Zeng & Zhaoqing Zhang & Nan Cheng & Yongqiang Luo, 2023. "Thermal Performance Analysis and Multi-Factor Optimization of Middle–Deep Coaxial Borehole Heat Exchanger System for Low-Carbon Building Heating," Sustainability, MDPI, vol. 15(21), pages 1-21, October.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:21:p:15215-:d:1266264
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    References listed on IDEAS

    as
    1. Song, Xianzhi & Wang, Gaosheng & Shi, Yu & Li, Ruixia & Xu, Zhengming & Zheng, Rui & Wang, Yu & Li, Jiacheng, 2018. "Numerical analysis of heat extraction performance of a deep coaxial borehole heat exchanger geothermal system," Energy, Elsevier, vol. 164(C), pages 1298-1310.
    2. Li, Ji & Xu, Wei & Li, Jianfeng & Huang, Shuai & Li, Zhao & Qiao, Biao & Yang, Chun & Sun, Deyu & Zhang, Guangqiu, 2021. "Heat extraction model and characteristics of coaxial deep borehole heat exchanger," Renewable Energy, Elsevier, vol. 169(C), pages 738-751.
    3. 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.
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    Cited by:

    1. Li, Mingqi & Shi, Yan & Chen, Hongxu & Liu, Chengcheng & Li, Hongchao, 2024. "Study on the heat transfer performance of coaxial casing heat exchanger for medium and deep geothermal energy in cold regions," Renewable Energy, Elsevier, vol. 237(PB).
    2. Luo, Yongqiang & Shen, Junhao & Song, Yixiao & Liu, Qingyuan & Huo, Fulei & Chu, Zhanpeng & Tian, Zhiyong & Fan, Jianhua & Zhang, Ling & Liu, Aihua, 2024. "Multi-segmented tube design and multi-objective optimization of deep coaxial borehole heat exchanger," Renewable Energy, Elsevier, vol. 237(PA).

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