Numerical model of heat exchange between a worker body and the hot environment

The subject of considerations enclosed in this paper is the mathematical model of the worker’s body-environment heat exchange in mining working. At the low and moderate temperature and humidity of air the basic way of carrying away of heat from human body is convection. In the difficult climatic conditions the evaporation of sweat is of prevailing importance. Heat exchange between miner’s body and his environment was calculated for transient state, when the temperature of body is changing. It has been assumed that the average skin temperature is a factor controlling convective, radiant and evaporative modes of heat exchange. The state of thermal stress is determined by accumulation of heat in worker’s body and increase of core and rectal temperature. The second measure of thermal stress is maximum of sweat rates emitted during work and dehydration level. The heat balance of human body affords possibilities for estimation of these parameters.