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Numerical investigation on the effects of geological parameters and layered subsurface on the thermal performance of medium-deep borehole heat exchanger

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  • Liu, Jun
  • Wang, Fenghao
  • Cai, Wanlong
  • Wang, Zhihua
  • Li, Chun

Abstract

Medium-deep borehole heat exchanger (MDBHE) has attracted considerable attention because of its ability to acquire large quantities of geothermal energy. Geological conditions in the medium-deep reservoir significantly affect thermal extraction. This study proposes a transient heat transfer model for MDBHE; the accuracy of the model is validated using experimental data. Using this model, the thermal performance of MDBHE under different geological parameters is investigated based on the operation characteristics of MDBHE. Sensitive analysis highlights the importance of the effects of geothermal gradient, thermal conductivity, and heat capacity of the rock soil on thermal extraction load (TEL) and thermal effect radius (TER) of the MDBHE. Results indicate that geothermal gradient affects the TEL mostly and heat capacity has the greatest impact on TER. In regions with low rock-soil heat capacity, borehole spacing should be sufficiently wide to prevent thermal interference between adjacent boreholes. For continuous operations of MDBHE, the annual average TEL declines with operating year and the declining proportion is the largest in the second year for 4%–6%. Besides, the maximum TER increases, with maximal increasing proportion in the second year up to ∼80%. Under different geological parameters, the declining proportion of TEL and increasing proportion of TER within the same year are almost identical. In addition, the thermal performance of MDBHE under layered subsurface is presented. Layered RTCs and geothermal gradients have a significant effect on the TEL of MDBHE; and layered subsurface with segmented RTCs and rock-soil heat capacities considerably affects the TER. This study will enable the wide promotion of MDBHE application in different regions.

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  • Liu, Jun & Wang, Fenghao & Cai, Wanlong & Wang, Zhihua & Li, Chun, 2020. "Numerical investigation on the effects of geological parameters and layered subsurface on the thermal performance of medium-deep borehole heat exchanger," Renewable Energy, Elsevier, vol. 149(C), pages 384-399.
    • Handle: RePEc:eee:renene:v:149:y:2020:i:c:p:384-399
    DOI: 10.1016/j.renene.2019.11.158
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    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. Yao, Jian & Liu, Wenjie & Zhang, Lu & Tian, Binshou & Dai, Yanjun & Huang, Mingjun, 2020. "Performance analysis of a residential heating system using borehole heat exchanger coupled with solar assisted PV/T heat pump," Renewable Energy, Elsevier, vol. 160(C), pages 160-175.
    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. 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.
    8. Ekmekci, Ece & Ozturk, Z. Fatih & Sisman, Altug, 2023. "Collective behavior of boreholes and its optimization to maximize BTES performance," Applied Energy, Elsevier, vol. 343(C).
    9. 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).
    10. 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.
    11. 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).
    12. 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.
    13. 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.

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