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Heat extraction performance simulation for various configurations of a downhole heat exchanger geothermal system

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  • Song, Xianzhi
  • Shi, Yu
  • Li, Gensheng
  • Yang, Ruiyue
  • Xu, Zhengming
  • Zheng, Rui
  • Wang, Gaosheng
  • Lyu, Zehao

Abstract

A downhole heat exchanger (DHE) geothermal system has been widely used for space heating in commercial and residential buildings. The DHE is important in heat extraction performance of the geothermal system. Nevertheless, to the best of our knowledge, the single U-tube is the most common configuration for a DHE. An investigation of the heat extraction performances of various DHE configurations is important. In this study, a 3D unsteady-state numerical model was established to describe the fluid flow and thermal processes of a DHE system. The model was validated by field experimental data. Three DHE configurations were evaluated, including a spiral tube, multiple-tubes with a parallel connection, and multiple-tubes with a serial connection. Subsequently, the influences of the key geometrical parameters for the three configurations on the DHE performance were analyzed. The DHE performances of the three configurations were compared. The simulation results showed that the outlet temperature and thermal power of the serial connection DHE were higher than those of the parallel connection with an equal number of tubes. Among the three configurations, the spiral tube DHE showed the greatest heat extraction performance. The key findings of this study could offer guidance for the optimisation and design of a DHE.

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  • Song, Xianzhi & Shi, Yu & Li, Gensheng & Yang, Ruiyue & Xu, Zhengming & Zheng, Rui & Wang, Gaosheng & Lyu, Zehao, 2017. "Heat extraction performance simulation for various configurations of a downhole heat exchanger geothermal system," Energy, Elsevier, vol. 141(C), pages 1489-1503.
    • Handle: RePEc:eee:energy:v:141:y:2017:i:c:p:1489-1503
    DOI: 10.1016/j.energy.2017.11.111
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    References listed on IDEAS

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    Cited by:

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    2. 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.
    3. Javadi, Hossein & Mousavi Ajarostaghi, Seyed Soheil & Rosen, Marc A. & Pourfallah, Mohsen, 2019. "Performance of ground heat exchangers: A comprehensive review of recent advances," Energy, Elsevier, vol. 178(C), pages 207-233.
    4. Liu, Qinggong & Tao, Yao & Shi, Long & Huang, Yi & Peng, Yuanling & Wang, Yong & Tu, Jiyuan, 2023. "Experimental investigations on the thermal performance of a novel ground heat exchanger under the synergistic effects of shape-stabilized phase change material and nanofluid," Energy, Elsevier, vol. 284(C).
    5. Huang, Yibin & Zhang, Yanjun & Xie, Yangyang & Zhang, Yu & Gao, Xuefeng & Ma, Jingchen, 2020. "Field test and numerical investigation on deep coaxial borehole heat exchanger based on distributed optical fiber temperature sensor," Energy, Elsevier, vol. 210(C).
    6. Shi, Yu & Cui, Qiliang & Song, Xianzhi & Xu, Fuqiang & Song, Guofeng, 2022. "Study on thermal performances of a horizontal ground heat exchanger geothermal system with different configurations and arrangements," Renewable Energy, Elsevier, vol. 193(C), pages 448-463.
    7. Xu, Fuqiang & Song, Xianzhi & Song, Guofeng & Ji, Jiayan & Song, Zihao & Shi, Yu & Lv, Zehao, 2023. "Numerical studies on heat extraction evaluation and multi-objective optimization of abandoned oil well patterns in intermittent operation mode," Energy, Elsevier, vol. 269(C).
    8. Theo Renaud & Lehua Pan & Hannah Doran & Gioia Falcone & Patrick G. Verdin, 2021. "Numerical Analysis of Enhanced Conductive Deep Borehole Heat Exchangers," Sustainability, MDPI, vol. 13(12), pages 1-21, June.
    9. Song, Xianzhi & Shi, Yu & Li, Gensheng & Yang, Ruiyue & Wang, Gaosheng & Zheng, Rui & Li, Jiacheng & Lyu, Zehao, 2018. "Numerical simulation of heat extraction performance in enhanced geothermal system with multilateral wells," Applied Energy, Elsevier, vol. 218(C), pages 325-337.

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