Experimental Research And Simulation On Heat And Humidity Exchange Between Airflow And Rock Wall In Mine

With the development of the social economy, the mining depth is increasing and the heat harm of mine becomes increasingly serious. The main development trend of mine temperature drop technology is mechanical refrigeration for lowering temperature. The choosing of refrigeration equipments need the cooling and humidity load of laneway first. Thus, making the mechanism of heat and humidity exchange between rock wall and airflow in mine clear is the base of mine temperature drop and dehumidification technology. The heat and humidity dissipating from the surrounding rock takes a biggest part of the total load, but the calculation of this part is most difficult. Compared with the calculation of cooling load for air conditioning building, the calculation of cooling load for mine has a higher complexity. Because the heat and humidity dissipating from the surrounding rock is a 3D unsteady process, a number of factors can influence heat transfer coefficient and humidity transfer coefficient, and the mechanism of heat and humidity exchange is quite complicated. At present, empirical formulas of former Soviet Union are usually used to calculate the cooling and humidity load in Chinese mines. However, some weaknesses exist in these formulas: firstly, the parameters needed in these formulas are too many to make the formulas feasible; secondly, the effect of mass transfer is ignored which makes the calculation result not so precise; finally, these formulas of former Soviet Union can't be applied to calculation for Chinese mines perfectly.In this paper, with the deteriorating status quo of the increasing depth and bad environment of the China coal mine, the equation of the heat and moisture exchange between the airflow and the tunnel wall was solved, the temperature and humidity field was simulated, the simulation experimental bed system was built with the similarity theory, experimental test data and software simulation was compared and the validity and accuracy of the simulation software was verified. At the same time, a series of studies were launched on the temperature and humidity field, the law of the temperature and humidity distribution, and a theoretical model can be used for actual mine was found.