Numerical analysis of the heat extraction performance of mine backfill heat exchanger based on phase change heat storage (PCHS-BFHE)
Deep mines contain a large amount of hot-rock geothermal energy, and one method to exploit it is to construct a backfill heat exchanger based on phase change heat storage (PCHS-BFHE) in the mine goaf. In this paper, the influence of the thermophysical parameters of phase change heat storage backfill...
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| Format: | Article |
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Elsevier
2025-02-01
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| Series: | Case Studies in Thermal Engineering |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X24017520 |
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| author | Pai Ning Feng Ju Juan Xu Meng Xiao Tengfei Wang Dong Wang Lu Si |
| author_facet | Pai Ning Feng Ju Juan Xu Meng Xiao Tengfei Wang Dong Wang Lu Si |
| author_sort | Pai Ning |
| collection | DOAJ |
| description | Deep mines contain a large amount of hot-rock geothermal energy, and one method to exploit it is to construct a backfill heat exchanger based on phase change heat storage (PCHS-BFHE) in the mine goaf. In this paper, the influence of the thermophysical parameters of phase change heat storage backfill (PCHSB), the heat extraction conditions, the groundwater seepage, and the heat exchange tube (HET) connection pattern on the heat extraction performance of PCHS-BFHE has been analyzed through numerical simulation, and a method for determining the reasonable tube spacing of the multi-tube series model has been proposed. The results indicate that the outlet-inlet temperature difference of the heat transfer fluid (HTF) is independent of the latent heat and the phase change temperature of PCHSB, but positively correlated with the thermal conductivity of PCHSB and the seepage velocity (perpendicular to the HET) of groundwater, negatively correlated with the inlet temperature and the mass flow rate of HTF. The multi-tube series model can obtain higher outlet temperature, but the total heat it extracts is lower. The proposed method for determining the reasonable tube spacing of the multi-tube series model is effective. The research results can provide theoretical support for the exploitation of mine geothermal. |
| format | Article |
| id | doaj-art-b8e526df9af3437f935c2ac2c1e2499a |
| institution | Kabale University |
| issn | 2214-157X |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj-art-b8e526df9af3437f935c2ac2c1e2499a2025-02-02T05:27:15ZengElsevierCase Studies in Thermal Engineering2214-157X2025-02-0166105721Numerical analysis of the heat extraction performance of mine backfill heat exchanger based on phase change heat storage (PCHS-BFHE)Pai Ning0Feng Ju1Juan Xu2Meng Xiao3Tengfei Wang4Dong Wang5Lu Si6State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, China University of Mining and Technology, Xuzhou, 221116, ChinaState Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, China University of Mining and Technology, Xuzhou, 221116, China; School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, 221116, China; Corresponding author. State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, China University of Mining and Technology, Xuzhou, 221116, China.Key Laboratory of Xinjiang Coal Resources Green Mining (Xinjiang Institute of Engineering), Ministry of Education, Urumqi, 830023, China; School of Mining and Geological Engineering, Xinjiang Institute of Engineering, Urumqi, Xinjiang, 830023, ChinaState Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, China University of Mining and Technology, Xuzhou, 221116, ChinaState Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, China University of Mining and Technology, Xuzhou, 221116, ChinaState Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, China University of Mining and Technology, Xuzhou, 221116, ChinaSchool of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, 221116, ChinaDeep mines contain a large amount of hot-rock geothermal energy, and one method to exploit it is to construct a backfill heat exchanger based on phase change heat storage (PCHS-BFHE) in the mine goaf. In this paper, the influence of the thermophysical parameters of phase change heat storage backfill (PCHSB), the heat extraction conditions, the groundwater seepage, and the heat exchange tube (HET) connection pattern on the heat extraction performance of PCHS-BFHE has been analyzed through numerical simulation, and a method for determining the reasonable tube spacing of the multi-tube series model has been proposed. The results indicate that the outlet-inlet temperature difference of the heat transfer fluid (HTF) is independent of the latent heat and the phase change temperature of PCHSB, but positively correlated with the thermal conductivity of PCHSB and the seepage velocity (perpendicular to the HET) of groundwater, negatively correlated with the inlet temperature and the mass flow rate of HTF. The multi-tube series model can obtain higher outlet temperature, but the total heat it extracts is lower. The proposed method for determining the reasonable tube spacing of the multi-tube series model is effective. The research results can provide theoretical support for the exploitation of mine geothermal.http://www.sciencedirect.com/science/article/pii/S2214157X24017520Mine geothermalPhase change heat storage backfillBackfill heat exchangerGroundwater seepageNumerical simulation |
| spellingShingle | Pai Ning Feng Ju Juan Xu Meng Xiao Tengfei Wang Dong Wang Lu Si Numerical analysis of the heat extraction performance of mine backfill heat exchanger based on phase change heat storage (PCHS-BFHE) Case Studies in Thermal Engineering Mine geothermal Phase change heat storage backfill Backfill heat exchanger Groundwater seepage Numerical simulation |
| title | Numerical analysis of the heat extraction performance of mine backfill heat exchanger based on phase change heat storage (PCHS-BFHE) |
| title_full | Numerical analysis of the heat extraction performance of mine backfill heat exchanger based on phase change heat storage (PCHS-BFHE) |
| title_fullStr | Numerical analysis of the heat extraction performance of mine backfill heat exchanger based on phase change heat storage (PCHS-BFHE) |
| title_full_unstemmed | Numerical analysis of the heat extraction performance of mine backfill heat exchanger based on phase change heat storage (PCHS-BFHE) |
| title_short | Numerical analysis of the heat extraction performance of mine backfill heat exchanger based on phase change heat storage (PCHS-BFHE) |
| title_sort | numerical analysis of the heat extraction performance of mine backfill heat exchanger based on phase change heat storage pchs bfhe |
| topic | Mine geothermal Phase change heat storage backfill Backfill heat exchanger Groundwater seepage Numerical simulation |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X24017520 |
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