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Numerical investigation on the capacity and efficiency of a deep enhanced U-tube borehole heat exchanger system for building heating

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  • Chen, Chaofan
  • Cai, Wanlong
  • Naumov, Dmitri
  • Tu, Kun
  • Zhou, Hongwei
  • Zhang, Yuping
  • Kolditz, Olaf
  • Shao, Haibing

Abstract

Deep geothermal energy has become widely exploited in recent years through the use of closed loop systems for building heating. Intended to meet high heating demand in densely populated neighbourhoods, an enhanced U-tube borehole heat exchanger (EUBHE) system, in which a deviated deep borehole is connected with another vertical one to form a closed loop, is introduced in this work. For capacity and efficiency analysis of applying EUBHE systems to extract deep geothermal energy, a 3D numerical model is implemented and established based on the OpenGeoSys software. Through evaluation by thermal performance tests and thermal response tests on the EUBHE system, the maximum sustainable heat extraction rate is found to be 1.2 MW in a single heating season and 1.1 MW in 10 years, which can provide heating to more than 35,000 m2 of residential buildings located in northern China. Moreover, the 10-year system thermal performance and efficiency are evaluated when coupled with a ground source heat pump (GSHP), and compared with the two deep borehole heat exchanger (2-DBHE) array system that has the same total borehole length as the EUBHE system. Results show that GSHP-coupled EUBHE system is more efficient than the 2-DBHE array system, as it consumes 27% less electricity.

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  • Chen, Chaofan & Cai, Wanlong & Naumov, Dmitri & Tu, Kun & Zhou, Hongwei & Zhang, Yuping & Kolditz, Olaf & Shao, Haibing, 2021. "Numerical investigation on the capacity and efficiency of a deep enhanced U-tube borehole heat exchanger system for building heating," Renewable Energy, Elsevier, vol. 169(C), pages 557-572.
    • Handle: RePEc:eee:renene:v:169:y:2021:i:c:p:557-572
    DOI: 10.1016/j.renene.2021.01.033
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    4. 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.
    5. 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.
    6. 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).
    7. Gascuel, Violaine & Rivard, Christine & Raymond, Jasmin, 2024. "Deep geothermal doublets versus deep borehole heat exchangers: A comparative study for cold sedimentary basins," Applied Energy, Elsevier, vol. 361(C).
    8. Cai, Wanlong & Wang, Fenghao & Chen, Chaofan & Chen, Shuang & Liu, Jun & Ren, Zhanli & Shao, Haibing, 2022. "Long-term performance evaluation for deep borehole heat exchanger array under different soil thermal properties and system layouts," Energy, Elsevier, vol. 241(C).
    9. Zhang, Sheng & Liu, Jun & Zhang, Xia & Wang, Fenghao, 2024. "Properly shortening design time scale of medium-deep borehole heat exchanger for high building heating performances with high computational efficiency," Energy, Elsevier, vol. 290(C).
    10. 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).
    11. Huang, Shuai & Li, Jiqin & Zhu, Ke & Dong, Jiankai & Jiang, Yiqiang, 2024. "Numerical investigation on the long-term heating performance and sustainability analysis of medium-deep U-type borehole heat exchanger system," Energy, Elsevier, vol. 289(C).

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