Abstract
ABSTRACT In order to improve thermal and humid environment of the heat hazard mine, a ground cooling system is proposed. In the ground cooling system, the chilled water is transmitted to the air cooler in working face through long-distance vertical-buried pipes (LDVBP). Under this background, the simplified numerical heat transfer model between LDVBP and rock-soil layers is established to calculate the temperature rise and heat loss of the chilled water. Comparing the calculated results with the measured data in Wutongzhuang Coal Mine of Hebei province, the error is less than 5%. Furthermore, the numerical simulation results show the main influencing factors on heat loss of LDVBP are the heat transfer temperature difference of underground high- and low-pressure heat exchanger, flow rate, and inlet temperature of supply water when there is no groundwater seepage, which should be considered in ground cooling system design. In this study, the supply water temperature rise is 0.15°C and the comprehensive heat loss coefficient is less than 5.8%, which can meet the requirements of mine cooling engineering.
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