Abstract: Based on heat transfer theory, and in consideration of the characteristic of moist wall, the mathematical model of heat and moisture transfer between mine inlet air and airway walls was set up and the factors influencing inlet air temperature were analyzed, including tunnel physical dimension, rock thermophysical nature, and initial temperature of inlet air. The results show that rock thermophysical nature is the main factor influencing the inlet air temperature in underground mine; the air flow temperature increases with the depth of mine; the larger the hydraulic radius of tunnel is, the greater the change in the inlet air temperature in drift at the same depth will be; the influence of the initial inlet temperature on the underground air flow decreases with the increase in depth; and at the deep level of temperature increasing zone, the air flow temperature is mostly affected by the rock stratum exothermicity.

Key words: Inlet air, Heat and moisture transfer, Hydraulic radius, Temperature gradient, Ground temperature, Initial temperature