IMPROVING METHODS FOR CALCULATING AIR TEMPERATURE IN MINE WORKINGS EQUIPPED WITH COLD WATER PIPELINESVadim Rudolfovich Alabyev and Gennady Ivanovich Korshunov
Mining in high temperature conditions may lead to deterioration of miners health and lower productivity. In recent years, refrigeration equipment has been increasingly used in coal mines in Russia and Ukraine to improve temperature conditions in working places. This is largely because in the last decade new models of mine refrigeration equipment have been designed. The existing methods of calculating cooling loss in cold water pipelines are imperfect as they suggest calculating mass-transfer coefficient by using empirical dependence, without considering real humidity conditions in mine workings, which results in significant errors. In order to calculate the temperature of cold water in mine air-conditioning systems the heat balance equation was used, which included the cooling loss to the environment. The mass-exchange processes, including the pipeline surface mass-exchange, were calculated by setting the pattern of changes in relative humidity along the whole length of the mine working. The calculated dependences for the air temperature in mine workings that consider the cooling loss from cold water pipelines were corrected, and calculating methods were recommended. In order to assess the reliability of calculation of cold water temperature in mine workings equipped with cold water pipelines, experimental research in the mine was carried out. The experimental data were compared to the calculation results. It has been proved that the calculated air and cold water temperature comply satisfactorily with field observation data and could be recommended for practical use.
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