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Collaborative Optimization of Stope Cooling and Geothermal Energy Exploitation for Backfill Embedded Heat Exchanger

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  • Mei Wang

    (Energy School, Xi’an University of Science and Technology, Xi’an 710054, China
    Key Laboratory of Western Mines and Hazards Prevention, Ministry of Education of China, Xi’an 710054, China)

  • Wanying Ni

    (Energy School, Xi’an University of Science and Technology, Xi’an 710054, China)

  • Lang Liu

    (Energy School, Xi’an University of Science and Technology, Xi’an 710054, China)

  • Yutong Zan

    (Energy School, Xi’an University of Science and Technology, Xi’an 710054, China)

  • Jiahui Li

    (Energy School, Xi’an University of Science and Technology, Xi’an 710054, China)

Abstract

Backfillembedded heat exchanger (BEHE) are used for stope cooling during the mining process and for geothermal energy recovery during the long-term heat extraction stage. This study develops a three-dimensional BEHE model to optimize the pipe arrangement, considering both the immediate requirements of stope cooling and the long-term objectives of geothermal energy exploitation. To evaluate the effects of geothermal energy extraction and stope cooling, heat extraction per meter and average temperature in the stope area are used as criterion parameters. The results indicate that the cooling efficiency is positively correlated with the number of pipe layers and pipe diameter, while it is negatively correlated with pipe spacing, interlayer spacing, and the distance from the bottom of the backfill-embedded heat exchanger (BEHE) to the cold radiation surface. Geothermal energy extraction, on the other hand, is positively correlated with the number of pipe layers, interlayer spacing, and the distance from the bottom of the BEHE to the cold radiation surface. Considering both objectives, the optimal pipe arrangement is determined to be PLS = 1.0 m, S = 500 mm, F = 3, D = 0.05 m, and DN = 50 mm. Additionally, based on a comprehensive analysis of extensive calculation results, an empirical correlation for heat extraction per meter as a function of pipe arrangement parameters was derived.

Suggested Citation

  • Mei Wang & Wanying Ni & Lang Liu & Yutong Zan & Jiahui Li, 2025. "Collaborative Optimization of Stope Cooling and Geothermal Energy Exploitation for Backfill Embedded Heat Exchanger," Sustainability, MDPI, vol. 17(3), pages 1-24, February.
    • Handle: RePEc:gam:jsusta:v:17:y:2025:i:3:p:1251-:d:1583425
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    References listed on IDEAS

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    1. Xiaoyan Zhang & Baoyun Bu & Lang Liu & Tianrun Cao & Yaping Ke & Qiangqiang Du, 2021. "Numerical Simulation on Cooling Effect of Working Face under Radiation Cooling Mode in Deep Well," Energies, MDPI, vol. 14(15), pages 1-18, July.
    2. Olabi, Abdul Ghani & Mahmoud, Montaser & Soudan, Bassel & Wilberforce, Tabbi & Ramadan, Mohamad, 2020. "Geothermal based hybrid energy systems, toward eco-friendly energy approaches," Renewable Energy, Elsevier, vol. 147(P1), pages 2003-2012.
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