Sustainability evaluation model of geothermal resources in abandoned coal mine

Guo, Pingye; Zheng, Liange; Sun, Xiaoming; He, Manchao; Wang, Yanwei; Shang, Jingshi

doi:10.1016/j.applthermaleng.2018.06.070

Cited by 28 publications

(4 citation statements)

References 27 publications

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“…Techno-economic feasibility analysis of geothermal systems is critical for the widespread acceptance and social popularity of geothermal energy systems. Guo et al [55] assessed the sustainability of geothermal resources in an abandoned coal mine.…”

Section: Techno-economic and Environmental Performance Analysismentioning

confidence: 99%

Application of abandoned wells integrated with renewables

Zhou

Liu

Xing

2022

Utilization of Thermal Potential of Abandoned Wells

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Section: Techno-economic and Environmental Performance Analysismentioning

confidence: 99%

Application of abandoned wells integrated with renewables

Zhou

Liu

Xing

2022

Utilization of Thermal Potential of Abandoned Wells

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“…Researchers at home and abroad have conducted extensive research on the extraction of geothermal energy. Guo et al [10,11] established three heat storage models with considering different water storage spaces. Sensitivity analysis of model results shows that heat storage capacity is closely related to recharge flow, recharge temperature and running time.…”

Section: Introductionmentioning

confidence: 99%

Study on heat storage and heat release performance of casing heat pipe heat exchanger coupled phase change backfill body

Ji,

Zhang,

Wang

et al. 2024

Eighth International Conference on Energy System, Electricity, and Power (ESEP 2023)

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In order to improve the utilization of mine geothermal resource, the casing heat pipe heat exchanger coupled phase change backfill heat transfer system is proposed in this paper. The effects of the number of casing heat pipe heat exchanger (CHPHE) on the system temperature distribution, the liquid phase fraction of phase change material (PCM) and the heat storage/heat release performance of system were studied by numerical simulation. The results showed that with increase in CHPHE number, the internal temperature of backfill body increases slowly, and the melting rate of PCM slows down. In the heat storage/heat release coexistence stage, the temperature of backfill body decreases rapidly, and the solidification rate of PCM inside the casing heat exchanger accelerates. When CHPHE number is 2, 3 and 4, the complete melting time of PCM is 2.25 h, 3.16 h and 3.33 h, and the complete solidification time is 1.06 h, 1.20 h and 1.24 h respectively. As CHPHE number increases from 2 to 4, temperature difference between the inlet and outlet CHPHE cooling water during heat storage/heat release coexistence stage decreases from 3.63 ℃ to 1.63 ℃. When CHPHE number increases from 2 to 4, the total heat storage capacity increases from 3320.61 kJ to 3757.88 kJ, and the growth rate is 7.14%. While the heat release capacity increases from 2881.06 kJ to 3110.97 kJ, and the growth rate is 7.98%. However, the more CHPHE number, the greater the thermal interference between heat pipe heat exchangers, and the smaller system energy efficiency coefficient -The energy efficiency coefficient of CHPHE-PCB system will reduce from 86.76% to 82.77%(a reduction of 3.99%) as CHPHE number increases from 2 to 4. The research results obtained in this study can guild the highly efficient exploitation of mine geothermal energy.

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“…Ghoreishi et al [7] first applied the underground pipe heat transfer technology to the backfilling mine to exploit the deep mine geothermal energy by using the backfilling body as the heat storage medium, and the results of the study elucidated its feasibility and good economic benefits. Guo Pingye et al [8] concluded that the use of underground space for anti-seasonal cyclic energy storage can realize efficient heating and cooling in winter and summer seasons, significantly reduce the carbon dioxide emission coefficient, and enhance economic benefits. Li et al [9] used numerical methods to evaluate the thermal storage performance of the backfilling quarry with pre-buried heat exchanger pipes, and the results showed that a 3 km long underground backfilling quarry of a typical coal mine could provide 23 GWh of thermal energy per year.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on the Performance of Horizontal Helical-Coil-Type Backfill Heat Exchangers with Different Configurations in Mine Stopes

Zhang,

Shi,

Zhang

et al. 2023

Mathematics

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The application of ground heat exchanger technology in backfill mines can actualize subterranean heat storage, which is one of the most effective solutions for addressing solar energy faults such as intermittence and fluctuation. This paper provides a 3D unsteady heat transfer numerical model for full-size horizontal backfill heat exchangers (BFHEs) with five configurations in a mining layer of a metal mine by using a COMSOL environment. In order to ensure the fairness of the comparative analysis, the pipes of BFHEs studied have the same heat exchange surface area. By comparing and evaluating the heat storage/release characteristics of BFHEs in continuous operation for three years, it was discovered that the helical pipe with serpentine layout may effectively enhance the performance of BFHEs. Compared with the traditional SS BFHEs, the heat storage capacity of the S-FH type is significantly increased by 21.7%, followed by the SA-FH type, which is increased by 11.1%, while the performances of U-DH and SH type are considerably lowered. Also, the impact of the critical structural factors (pitch length and pitch diameter) was further studied using the normalized parameters C1 and C2 based on the inner diameter of the pipe. It is discovered that BFHEs should be distributed in a pipe with a lower C1, and increasing C2 encourages BFHEs to increase the storaged/released heat of BFHEs. By comparatively analysing the effect of thermal conductivity, it is found that the positive effects of thermal conductivity on the performance of SH, U-DH, SA-FH, and S-FH type BFHEs are found to decrease successively. This work proposes a strategy for improving the heat storage and release potential of BFHEs in terms of optimal pipe arrangement.

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Sustainability evaluation model of geothermal resources in abandoned coal mine

Cited by 28 publications

References 27 publications

Application of abandoned wells integrated with renewables

Application of abandoned wells integrated with renewables

Study on heat storage and heat release performance of casing heat pipe heat exchanger coupled phase change backfill body

Numerical Investigation on the Performance of Horizontal Helical-Coil-Type Backfill Heat Exchangers with Different Configurations in Mine Stopes

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