Abstract
In mine air conditioning systems, the vapour compression refrigeration cycle seems to be currently the most widespread method of artificial cooling. In literature some other methods for cooling a mine are also presented, like using free-cooling in refrigeration systems. Mine workings in Jiu Valley are using the primary and secondary ventilation system for cooling the underground. Today the activities are focused mainly on mine closure as a part of transition to the low carbon economy, and this situation brings new challenges regarding the mine ventilation system, which was designed to meet the needs of a full-scale operation. As a result, locally ambient temperatures can rise, and spot cooling systems can be used, in order to cool the air. Such a system has been considered and calculations have been made to evaluate its thermal efficiency at different ambient temperatures.
Highlights
In underground mines there are multiple heat sources
Exploitation of coal has a long tradition in the Jiu Valley, but today the activities are focused mainly on mine closure as a part of transition to the low carbon economy [9] according to EU directives
This situation brings new challenges regarding the mine ventilation system, which was designed to meet the needs of a full-scale operation
Summary
In underground mines there are multiple heat sources. Mine legislation requires a certain underground working temperature. Mine cooling systems forms an integral part of ensuring safe underground working conditions. Mines employ complex ventilation and cooling systems which can account for up to 25% of a mine’s electricity usage [1] which highlights the extent of the economic aspect of the problem. Did the systems designated primarily to assure safe working conditions and as a component of safety measures, to evacuate the heat from underground. First system used to evacuate heat is the primary and secondary ventilation system which usually consists of the main ventilation fans and smaller fans assuring local ventilation of working areas. As mines became deeper the result is a decrease in the effectivity of primary and secondary ventilation and cooling, which led to the need for additional cooling
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