Abstract
Heat flow in a hot mining department, where the original temperature of rock is greater than 50 0 C has been studied. The total power of electrical equipment installed in the department amounts to about 6 MW. In accordance with the current climate regulations of Polish mining, the air temperature in the workplace, measured with a dry-bulb thermometer may not be higher than 33 0 C. In order to be able to ensure a temperature consistent with the regulations in such department, fresh air supply workings must be equipped with chillers of a total refrigeration capacity of 2 MW. The carried out analysis of the results of climate forecasts and of the results of the rock mass cooling modelling around these workings has shown that approximately 30% of the cooling power is needed to receive the heat from the hot rock massif. Assuming the required air temperature at 28 0 C (enabling an unshortened working time), then the cooling power needed to extract heat from the rock mass would be much greater. The studies carried out show that the amount of heat emitted in the department also depends on the phase of the longwall course (the length of main gates and changes in rock temperature in them). It has been proposed that hot water from condensers supplies the crystallizers of surface (absorption) cooling devices. In this way, reduction of the air-conditioning expenditure will be obtained.
Highlights
In coal mines of the Upper Silesian Coal Basin and in adjacent Czech OKD mines, operation is carried out in rock mass of the original temperature well above 400C, and in the mines of OKD even over 500C
Considerations on heat emitted during operation in hot rock mass have been conducted
The results of the considerations on the heat stream coming from the hot rock mass show that about 30% of the installed refrigeration capacity is needed to transfer the rock mass heat
Summary
In coal mines of the Upper Silesian Coal Basin and in adjacent Czech OKD mines, operation is carried out in rock mass of the original temperature well above 400C, and in the mines of OKD even over 500C. 2 MW for the air-conditioning of the operation area. A question may arise whether it is possible to use even a part of the energy expended on the work of the cooling equipment. Works (Knechtel, 2006) show that the direct use of heat contained in the mine air through its removal on the surface is scarcely realistic, because the air is significantly cooled before it reaches the surface. The possibility of transferring this heat with hot water powering the cooling devices may be considered
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