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Analysis of geothermal heat recovery from abandoned coal mine water for clean heating and cooling: A case from Shandong, China

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  • Wang, Huajun
  • Xu, Yishuo
  • Yuan, Lijuan
  • Sun, Yukun
  • Cai, Yun

Abstract

Exploiting heat from abandoned mine water using heat pumps is attracting increasing attention worldwide. China has a large number of abandoned coal mines, but there are few applications of geothermal heat recovery from mine water. Here, we report a new case from Shandong, North China. Based on actual geological and underground space structures, numerical analysis is performed to study the flow and heat transfer in the complex connection network among roadways. For given temperature differences on the source side, the underground heat transfer is greatly influenced by flow rates in roadways. Under the acceptable performances and long-term stability of heat pumps, the maximum heat transfer capacity of roadways reaches 697.3 kW at the flow rate of 100 m3/h, with the power per unit length of 151.3 W/m, indicating a promising heat recovery potential. When switching between the extraction and injection well, both fluid directions and the distribution of flow rates in roadways change obviously, thereby affecting the underground heat transfer. Besides dominant flow paths, there exist weak flow paths, which can be identified by numerical analysis, and necessary blocking can be applied to optimize the flow and heat transfer. Excessively long horizontal straight roadways for heat exchange should be avoided.

Suggested Citation

  • Wang, Huajun & Xu, Yishuo & Yuan, Lijuan & Sun, Yukun & Cai, Yun, 2024. "Analysis of geothermal heat recovery from abandoned coal mine water for clean heating and cooling: A case from Shandong, China," Renewable Energy, Elsevier, vol. 228(C).
    • Handle: RePEc:eee:renene:v:228:y:2024:i:c:s0960148124007274
    DOI: 10.1016/j.renene.2024.120659
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    References listed on IDEAS

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    4. Huajun, Wang, 2022. "New approach to the thermal properties of carbonate rocks in geothermal reservoirs: Molecular dynamics calculation and case studies," Renewable Energy, Elsevier, vol. 198(C), pages 861-871.
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