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Heat extraction model and characteristics of coaxial deep borehole heat exchanger

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  • Li, Ji
  • Xu, Wei
  • Li, Jianfeng
  • Huang, Shuai
  • Li, Zhao
  • Qiao, Biao
  • Yang, Chun
  • Sun, Deyu
  • Zhang, Guangqiu

Abstract

Middle and deep geothermal resources are abundant and have the advantages of being clean, stable, and reliable. However, a widely recognised theoretical model of deep ground heat exchangers is currently lacking owing to the uncertainty of the underground geotechnical environment and the complex heat transfer mechanism of such heat exchangers. Therefore, considering the stratification of the rock and soil layers, a heat extraction model of a coaxial deep borehole heat exchanger was established in this study. In addition, MATLAB software was used to conduct an unsteady-state numerical simulation based on the finite difference method, and the simulation results is verified through a long-duration comparison with actual measured engineering data. It is observed that (1) the numerical calculation results are in agreement with the actual engineering measurement results; (2) under the test conditions, the radius of influence of the deep borehole heat exchanger on the temperature of the surrounding rock and soil layer is approximately 7 m after continuous operation throughout the heating season; (3) the heat extraction increases with increasing circulation flow rate and outer diameter of the buried pipe; and (4) the linear meter heat exchange power should not be greater than 150 W. This study provides important guidance for research on coaxial deep borehole heat exchangers.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:renene:v:169:y:2021:i:c:p:738-751
    DOI: 10.1016/j.renene.2021.01.036
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    2. Zhang, Fangfang & Yu, Mingzhi & Sørensen, Bjørn R. & Cui, Ping & Zhang, Wenke & Fang, Zhaohong, 2022. "Heat extraction capacity and its attenuation of deep borehole heat exchanger array," Energy, Elsevier, vol. 254(PA).
    3. Luo, Yongqiang & Xu, Guozhi & Zhang, Shicong & Cheng, Nan & Tian, Zhiyong & Yu, Jinghua, 2022. "Heat extraction and recover of deep borehole heat exchanger: Negotiating with intermittent operation mode under complex geological conditions," Energy, Elsevier, vol. 241(C).
    4. Luo, Yongqiang & Xu, Guozhi & Cheng, Nan, 2021. "Proposing stratified segmented finite line source (SS-FLS) method for dynamic simulation of medium-deep coaxial borehole heat exchanger in multiple ground layers," Renewable Energy, Elsevier, vol. 179(C), pages 604-624.
    5. Li, Zhibin & Huang, Wenbo & Chen, Juanwen & Cen, Jiwen & Cao, Wenjiong & Li, Feng & Jiang, Fangming, 2023. "An enhanced super-long gravity heat pipe geothermal system: Conceptual design and numerical study," Energy, Elsevier, vol. 267(C).
    6. Huang, Shuai & Zhu, Ke & Dong, Jiankai & Li, Ji & Kong, Weizheng & Jiang, Yiqiang & Fang, Zhaohong, 2022. "Heat transfer performance of deep borehole heat exchanger with different operation modes," Renewable Energy, Elsevier, vol. 193(C), pages 645-656.
    7. Wenjing Li & Wenke Zhang & Zhenxing Li & Haiqing Yao & Ping Cui & Fangfang Zhang, 2022. "Investigation of the Heat Transfer Performance of Multi-Borehole Double-Pipe Heat Exchangers in Medium-Shallow Strata," Energies, MDPI, vol. 15(13), pages 1-19, June.
    8. Li, Chao & Jiang, Chao & Guan, Yanling, 2022. "An analytical model for heat transfer characteristics of a deep-buried U-bend pipe and its heat transfer performance under different deflecting angles," Energy, Elsevier, vol. 244(PA).
    9. Li, Jianwei & Bao, Lingling & Niu, Guoqing & Miao, Zhuang & Guo, Xiaokai & Wang, Weilian, 2024. "Research on renewable energy coupling system based on medium-deep ground temperature attenuation," Applied Energy, Elsevier, vol. 353(PB).
    10. huajun, Wang & Yishuo, Xu & Yukun, Sun & Sumin, Zhao, 2022. "Heat extraction by deep coaxial borehole heat exchanger for clean space heating near Beijing, China: Field test, model comparison and operation pattern evaluation," Renewable Energy, Elsevier, vol. 199(C), pages 803-815.
    11. Li, Chao & Jiang, Chao & Guan, Yanling & Chen, Hao & Yang, Ruitao & Wan, Rong & Shen, Lu, 2023. "Comparison of the experimental and numerical results of coaxial-type and U-type deep-buried pipes’ heat transfer performances," Renewable Energy, Elsevier, vol. 210(C), pages 95-106.
    12. Niu, Qinghe & Ma, Kaiyuan & Wang, Wei & Pan, Jienan & Wang, Qizhi & Du, Zhigang & Wang, Zhenzhi & Yuan, Wei & Zheng, Yongxiang & Shangguan, Shuantong & Qi, Xiaofei & Pan, Miaomiao & Ji, Zhongmin, 2023. "Multifactor analysis of heat extraction performance of coaxial heat exchanger applied to hot dry rock resources exploration: A case study in matouying uplift, Tangshan, China," Energy, Elsevier, vol. 282(C).
    13. Zhendi Ma & Siyu Qin & Yuping Zhang & Wei-Hsin Chen & Guosheng Jia & Chonghua Cheng & Liwen Jin, 2023. "Effects of Boundary Conditions on Performance Prediction of Deep-Buried Ground Heat Exchangers for Geothermal Energy Utilization," Energies, MDPI, vol. 16(13), pages 1-27, June.
    14. Zhang, Fangfang & Fang, Liang & Jia, Linrui & Man, Yi & Cui, Ping & Zhang, Wenke & Fang, Zhaohong, 2021. "A dimension reduction algorithm for numerical simulation of multi-borehole heat exchangers," Renewable Energy, Elsevier, vol. 179(C), pages 2235-2245.
    15. 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.
    16. Li, Chao & Jiang, Chao & Guan, Yanling & Tan, Zijing & Zhao, Zhiqiang & Zhou, Yang, 2022. "Development and applicability of heat transfer analytical model for coaxial-type deep-buried pipes," Energy, Elsevier, vol. 255(C).
    17. Jia, G.S. & Ma, Z.D. & Xia, Z.H. & Zhang, Y.P. & Xue, Y.Z. & Chai, J.C. & Jin, L.W., 2022. "A finite-volume method for full-scale simulations of coaxial borehole heat exchangers with different structural parameters, geological and operating conditions," Renewable Energy, Elsevier, vol. 182(C), pages 296-313.
    18. Chen, Hongfei & Liu, Hongtao & Yang, Fuxin & Tan, Houzhang & Wang, Bangju, 2023. "Field measurements and numerical investigation on heat transfer characteristics and long-term performance of deep borehole heat exchangers," Renewable Energy, Elsevier, vol. 205(C), pages 1125-1136.
    19. Hirvijoki, Eero & Hirvonen, Janne, 2022. "The potential of intermediate-to-deep geothermal boreholes for seasonal storage of district heat," Renewable Energy, Elsevier, vol. 198(C), pages 825-832.
    20. Jun Liu & Yuping Zhang & Zeyuan Wang & Cong Zhou & Boyang Liu & Fenghao Wang, 2023. "Medium Rock-Soil Temperature Distribution Characteristics at Different Time Scales and New Layout Forms in the Application of Medium-Deep Borehole Heat Exchangers," Energies, MDPI, vol. 16(19), pages 1-22, October.
    21. Chen, Wen & Zhou, Chaohui & Huang, Xinyu & Luo, Hanbin & Luo, Yongqiang & Cheng, Nan & Tian, Zhiyong & Zhang, Shicong & Fan, Jianhua & Zhang, Ling, 2024. "Study on thermal radius and capacity of multiple deep borehole heat exchangers: Analytical solution, algorithm and application based on Response Factor Matrix method (RFM)," Energy, Elsevier, vol. 296(C).

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