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Numerical analysis of the heat production performance of a closed loop geothermal system

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  • Song, Xianzhi
  • Shi, Yu
  • Li, Gensheng
  • Shen, Zhonghou
  • Hu, Xiaodong
  • Lyu, Zehao
  • Zheng, Rui
  • Wang, Gaosheng

Abstract

The Closed Loop Geothermal System (CLGS) is a novel method for exploiting geothermal energy. However, to the best of our knowledge, few studies have investigated the heat production performance of CLGS, which is particularly important for its field application. Hence, in this paper, an unsteady-state heat transfer model for CLGS is presented that considers variation of convection heat transfer coefficient. The finite difference method is employed to solve the mathematical model. The proposed model is verified with an analytical solution. Subsequently, the temperature field of CLGS is analysed, and influences of key parameters on CLGS performance are studied. The results indicate that the production process of CLGS can be divided into three sections: decreasing region, transition region and stable production region. The flow rate, inlet temperature and horizontal section length have significant influences on CLGS performance. To obtain the higher thermal power and appropriate outlet temperature, there is a critical value for flow rate. Additionally, the longer horizontal section length and larger temperature difference between the working fluid and formation are beneficial for improving CLGS performance. Finally, small wellbores should be drilled for CLGS. The main findings of this work can offer guidance for the design and optimization of CLGS.

Suggested Citation

  • Song, Xianzhi & Shi, Yu & Li, Gensheng & Shen, Zhonghou & Hu, Xiaodong & Lyu, Zehao & Zheng, Rui & Wang, Gaosheng, 2018. "Numerical analysis of the heat production performance of a closed loop geothermal system," Renewable Energy, Elsevier, vol. 120(C), pages 365-378.
    • Handle: RePEc:eee:renene:v:120:y:2018:i:c:p:365-378
    DOI: 10.1016/j.renene.2017.12.065
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    15. Yildirim, Nurdan & Parmanto, Slamet & Akkurt, Gulden Gokcen, 2019. "Thermodynamic assessment of downhole heat exchangers for geothermal power generation," Renewable Energy, Elsevier, vol. 141(C), pages 1080-1091.
    16. Hu, Zixu & Xu, Tianfu & Feng, Bo & Yuan, Yilong & Li, Fengyu & Feng, Guanhong & Jiang, Zhenjiao, 2020. "Thermal and fluid processes in a closed-loop geothermal system using CO2 as a working fluid," Renewable Energy, Elsevier, vol. 154(C), pages 351-367.
    17. Theo Renaud & Patrick G. Verdin & Gioia Falcone, 2020. "Conjugated Numerical Approach for Modelling DBHE in High Geothermal Gradient Environments," Energies, MDPI, vol. 13(22), pages 1-18, November.
    18. Shen, Junhao & Zhou, Chaohui & Luo, Yongqiang & Tian, Zhiyong & Zhang, Shicong & Fan, Jianhua & Ling, Zhang, 2023. "Comprehensive thermal performance analysis and optimization study on U-type deep borehole ground source heat pump systems based on a new analytical model," Energy, Elsevier, vol. 274(C).
    19. Zhang, Liang & Yang, Linchao & Geng, Songhe & Wen, Ronghua & He, Chuan & Liang, Yuzhu & Yang, Hongbin, 2022. "Numerical simulation on the heat extraction from the porous medium-low temperature geothermal reservoirs by self-circulation wellbore and its enhanced methods," Renewable Energy, Elsevier, vol. 194(C), pages 1009-1025.
    20. Esmaeilpour, Morteza & Gholami Korzani, Maziar & Kohl, Thomas, 2022. "Impact of thermosiphoning on long-term behavior of closed-loop deep geothermal systems for sustainable energy exploitation," Renewable Energy, Elsevier, vol. 194(C), pages 1247-1260.
    21. Bi, Yuehong & Lyu, Tianli & Wang, Hongyan & Sun, Ruirui & Yu, Meize, 2019. "Parameter analysis of single U-tube GHE and dynamic simulation of underground temperature field round one year for GSHP," Energy, Elsevier, vol. 174(C), pages 138-147.
    22. Chen, Jingping & Feng, Shaohang, 2020. "Evaluating a large geothermal absorber’s energy extraction and storage performance in a common geological condition," Applied Energy, Elsevier, vol. 279(C).
    23. 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.

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