Numerical and experimental study of geothermal heat extraction from backfilled mine stopes

Ghoreishi‐Madiseh, Seyed Ali; Hassani, Ferri; Abbasy, Farzaan

doi:10.1016/j.applthermaleng.2014.11.023

Cited by 59 publications

(19 citation statements)

References 19 publications

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“…To validate the numerical model used in this paper, its results were compared with the experimental result of Reference [38]. To establish a common ground with the experimental work, the proposed borehole thermal storage system was re-scaled to the size of the lab experiment explained in Reference [38]. Re-scaling of the model also included the timeframe of the experimental work providing a comparably higher data resolution of the heat storage process at a shorter timeframe.…”

Section: Model Validationmentioning

confidence: 99%

“…Re-scaling of the model also included the timeframe of the experimental work providing a comparably higher data resolution of the heat storage process at a shorter timeframe. Figure 3 depicts the comparison between the experimental data from Reference [38] and the results generated from the proposed thermal storage model. As shown in Figure 3, a good agreement can be observed between the proposed model and the experimental data with the maximum relative error found to be 4%.…”

Section: Model Validationmentioning

confidence: 99%

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Application of Borehole Thermal Energy Storage in Waste Heat Recovery from Diesel Generators in Remote Cold Climate Locations

et al. 2019

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Remote communities that have limited or no access to the power grid commonly employ diesel generators for communal electricity provision. Nearly 65% of the overall thermal energy input of diesel generators is wasted through exhaust and other mechanical components such as water-jackets, intercoolers, aftercoolers, and friction. If recovered, this waste heat could help address the energy demands of such communities. A viable solution would be to recover this heat and use it for direct heating applications, as conversion to mechanical power comes with significant efficiency losses. Despite a few examples of waste heat recovery from water-jackets during winter, this valuable thermal energy is often discarded into the atmosphere during the summer season. However, seasonal thermal energy storage techniques can mitigate this issue with reliable performance. Storing the recovered heat from diesel generators during low heat demand periods and reusing it when the demand peaks can be a promising alternative. At this point, seasonal thermal storage in shallow geothermal reserves can be an economically feasible method. This paper proposes the novel concept of coupling the heat recovery unit of diesel generators to a borehole seasonal thermal storage system to store discarded heat during summer and provide upgraded heat when required during the winter season on a cold, remote Canadian community. The performance of the proposed ground-coupled thermal storage system is investigated by developing a Computational Fluid Dynamics and Heat Transfer model.

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Section: Model Validationmentioning

confidence: 99%

Section: Model Validationmentioning

confidence: 99%

Application of Borehole Thermal Energy Storage in Waste Heat Recovery from Diesel Generators in Remote Cold Climate Locations

et al. 2019

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“…New technology, combined with filling mining and mine thermal damage control, is very significant for green, safe and efficient mining. Ghoreishi-Madiseh S.A. et al [25] confirmed the feasibility of applying the novel idea of harvesting geothermal energy from underground mine stopes, indicating that it could create "sustainable mining communities" that can produce inexpensive, clean and renewable energy not only during the mining operation, but also long after mine depletion. Liu Lang [26] et al proposed the academic concept of "function backfill", and the three concepts of "cold load/storage function backfill", "heat storage and release function backfill" and "cavity-building function backfill" are defined.…”

Section: Introductionmentioning

confidence: 91%

Experimental Research on Heat Transfer and Strength Analysis of Backfill with Ice Grains in Deep Mines

2019

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In deep mines, two urgent problems are a high temperature thermal environment and solid waste. Filling the goaf with slurry mixed with ice grains is an effective way to solve these two problems simultaneously. The thermal property and mechanical property of the ice-added backfill have a great influence on the cooling effect in the deep mine. In this study, an experimental facility for measuring the temperature distribution of ice-added backfill slurry was established, and the temperature of backfill slurry with different proportions was measured. Then, the thermal properties of temperature distribution and cooling capacity and the mechanical property of uniaxial compressive strength of the backfill specimens were analyzed, and the results indicated the following: firstly, the cooling capacity of ice-added backfill specimens is negatively related with the slurry concentration C and is positively related with the ice-water ratio Ω; secondly, the strength of backfill specimens is affected by the slurry concentration C and ice-water ratio Ω by a contrary law compared to the cooling capacity; thirdly, ice-added backfill slurry with an ice-water ratio Ω of 1:1 has the best mechanical property after solidification. The effects of the slurry concentration and ice-water ratio on the thermal and mechanical properties were analyzed, and the results indicated that the optimum proportion of ice-added backfill slurry is a slurry concentration of 74% and an ice-water ratio of 1:1 in the present research range. This study is significant for the deep mine cooling method with ice-added backfill.

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“…Geothermal energy has become a kind of groundwater resource which cannot be ignored [1] and it has low emission and energy generation cost [2][3]. However, it is not taken from the inexhaustible.…”

Section: Introductionmentioning

confidence: 99%

Application Research on Gradient Utilization of Geothermal Water in a Heating Process

Liu¹,

Si²

2015

Proceedings of the 5th International Conference on Information Engineering for Mechanics and Materials

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Abstract. Geothermal water is a material widely used to provide thermal energy for heating supply in China. To protect the water resource, save energy and ensure the sustainable economic development, more attention must be paid to reach the rational utilization of the geothermal water. In this paper, gradient utilization of the geothermal water in Donggu area in Tianjin China is studied with the analysis of the heating operation case of the heating control center in Donggu. Analysis results show that, both the direct geothermal supply at the beginning and the end of the heating and the direct geothermal supply combined adjusting heat by the heat pump in the middle of the heating alleviate the shortage situation of the heating water source in Donggu area by the gradient utilization of the geothermal tail water. In this way, the stability of the heating is ensured, and it meets the heating temperature requirements. And the purposes of saving energy, reducing consumption and protecting the resources are achieved.

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Numerical and experimental study of geothermal heat extraction from backfilled mine stopes

Cited by 59 publications

References 19 publications

Application of Borehole Thermal Energy Storage in Waste Heat Recovery from Diesel Generators in Remote Cold Climate Locations

Application of Borehole Thermal Energy Storage in Waste Heat Recovery from Diesel Generators in Remote Cold Climate Locations

Experimental Research on Heat Transfer and Strength Analysis of Backfill with Ice Grains in Deep Mines

Application Research on Gradient Utilization of Geothermal Water in a Heating Process

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