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Study on analytical solution model of heat transfer of ground heat exchanger in the protection engineering structure

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  • Wang, Jing
  • Mao, Jinfeng
  • Han, Xu
  • Li, Yong

Abstract

In order to eliminate the disadvantages of the high cost of underground pipe drilling and space occupation, according to the relevant practices of existing energy underground structures, the idea of embedding the buried pipe of the ground source heat pump system into the tunnel lining of protection engineering was proposed. An analytical model of the heat transfer process of the ground heat exchanger was established, and the explicit expressions of the calculated parameters were obtained. The reliability of the model was verified by the existing experimental data. The model was used to analyze the influence of different air temperature and flow rate on the heat transfer performance of the ground heat exchanger. The study found that every time the air temperature rises by 1 °C, the heat transfer per unit passageway length was reduced by about 200W. The increase in air flow velocity has a limited impact on the heat transfer. The method of enhancing heat transfers by increasing the flow velocity can only be performed at a small flow velocity. In the total heat exchange per unit length, the proportion of the heat exchange on the air side and the heat exchange on the surrounding rock side affect the protection capability of the project in an isolated state. The greater the proportion of heat exchange on the side of the surrounding rock, the stronger the protection capability in the isolated state.

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  • Wang, Jing & Mao, Jinfeng & Han, Xu & Li, Yong, 2021. "Study on analytical solution model of heat transfer of ground heat exchanger in the protection engineering structure," Renewable Energy, Elsevier, vol. 179(C), pages 998-1008.
    • Handle: RePEc:eee:renene:v:179:y:2021:i:c:p:998-1008
    DOI: 10.1016/j.renene.2021.07.081
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    References listed on IDEAS

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    1. Sterpi, D. & Tomaselli, G. & Angelotti, A., 2020. "Energy performance of ground heat exchangers embedded in diaphragm walls: Field observations and optimization by numerical modelling," Renewable Energy, Elsevier, vol. 147(P2), pages 2748-2760.
    2. Liu, Guodan & Li, Chuanrui & Hu, Songtao & Ji, Yongming & Tong, Zhen & Wang, Yimei & Tong, Li & Mao, Zhu & Lu, Shan, 2020. "Study on heat transfer model of capillary exchanger in subway source heat pump system," Renewable Energy, Elsevier, vol. 150(C), pages 1074-1088.
    3. Li, Min & Lai, Alvin C.K., 2015. "Review of analytical models for heat transfer by vertical ground heat exchangers (GHEs): A perspective of time and space scales," Applied Energy, Elsevier, vol. 151(C), pages 178-191.
    4. Ogunleye, Oluwaseun & Singh, Rao Martand & Cecinato, Francesco & Chan Choi, Jung, 2020. "Effect of intermittent operation on the thermal efficiency of energy tunnels under varying tunnel air temperature," Renewable Energy, Elsevier, vol. 146(C), pages 2646-2658.
    5. Ahmadfard, Mohammadamin & Bernier, Michel, 2019. "A review of vertical ground heat exchanger sizing tools including an inter-model comparison," Renewable and Sustainable Energy Reviews, Elsevier, vol. 110(C), pages 247-265.
    6. Park, Sangwoo & Lee, Dongseop & Lee, Seokjae & Chauchois, Alexis & Choi, Hangseok, 2017. "Experimental and numerical analysis on thermal performance of large-diameter cast-in-place energy pile constructed in soft ground," Energy, Elsevier, vol. 118(C), pages 297-311.
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    Cited by:

    1. Xu, Yishuo & Guo, Yanlong & Wang, Huajun & Wang, Bo & Zhao, Yanting & Shen, Jian, 2023. "Influences of seasonal changes of the ground temperature on the performance of ground heat exchangers embedded in diaphragm walls: A cold climate case from North China," Renewable Energy, Elsevier, vol. 217(C).
    2. Li, Chenglin & Zhang, Guozhu & Xiao, Suguang & Xie, Yongli & Liu, Xiaohua & Cao, Shiding, 2022. "Long-term operation of tunnel-lining ground heat exchangers in tropical zones: Energy, environmental, and economic performance evaluation," Renewable Energy, Elsevier, vol. 196(C), pages 1429-1442.
    3. Li, Chenglin & Zhang, Guozhu & Xiao, Suguang & Shi, Yehui & Xu, Chenghua & Sun, Yinjuan, 2023. "Numerical investigation on thermal performance enhancement mechanism of tunnel lining GHEs using two-phase closed thermosyphons for building cooling," Renewable Energy, Elsevier, vol. 212(C), pages 875-886.
    4. Hongyu Zhang & Fei Gan & Guangqin Huang & Chunlong Zhuang & Xiaodong Shen & Shengbo Li & Lei Cheng & Shanshan Hou & Ningge Xu & Zhenqun Sang, 2022. "Study on Heat Storage Performance of Phase Change Reservoir in Underground Protection Engineering," Energies, MDPI, vol. 15(15), pages 1-31, August.

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