Abstract
The study aims to develop a method of effectiveness evaluation for geothermal heat recovery in closed mines of Donbas using relations of heat transfer theory in rocks and fluids. Geothermal heat is proposed to recover using coaxial geothermal probes to be installed in flooded closed mines. As a result of evaluation and ranking, five top promising sites with the highest expected performance indicators among 27 closed mines located in Donbas have been identified. The evaluation method takes into account geological settings, mine condition, and heat exchange parameters of the probe with mine water. The locations of the most promising sites were found to correlate with the areas of higher geothermal flux and the deeper mines. The results obtained can be used in feasibility studies on installation and operation of geothermal probes in closed mines.
Highlights
Under the current trends of the global energy market and the requirements of the United Nations Climate Change Convention (Paris Agreement 2015) many coalmining countries are currently experiencing a sharp decline or shut down of coal production (Fig. 1), which is accompanied by mine closure [1, 2]
The key performance parameters such as efficiency factor, the coefficient of thermal and hydrodynamic efficiency, and coefficient of performance (COP) have been calculated for each site
The mines have been ranked according to the key parameter COP calculated by Eq 9; the dimensionless parameter E was considered as the supplementary criterion to take into account operational expenses
Summary
Under the current trends of the global energy market and the requirements of the United Nations Climate Change Convention (Paris Agreement 2015) many coalmining countries are currently experiencing a sharp decline or shut down of coal production (Fig. 1), which is accompanied by mine closure [1, 2]. In this concern, the study aims to develop a method for evaluating the potential sites for mine water heat recovery within a large coalmining region to identify the most promising locations. Regarding to geothermal and geotechnical conditions of the Donetsk coal basin, we examined 27 closed mines in terms of potential application of geothermal probes
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