MODELLING & ANALYSIS OF HUMAN THERMOREGULATORY SYSTEM

Abstract

In this work, we study the processes by which man achieves thermal equilibrium with his environment. Some of these processes are physiological and involuntary, and some are consciously controlled. Whatever process is involved, thermal equilibrium between a man and his environment depends on the physical mechanisms which govern heat transfer from the body core to the skin surface and from the skin through clothing to the environment. The heat balance equation, as employed in thermal physiology, therefore has both physical and physiological implication Equation M11 + R + H + G + J = 0 is an application of the first law of thermodynamic - the law of energy conservation and therefore satisfies the requirement that the sung of heat inputs, outputs and storage must be zero. When the energy conservation equation is expressed in this form, the balance is between terms which are heat gains by the body and those which involve heat dissipation. Usual sign convention is to ascribe a positive sign to the numerical values of the gains. Mn is net flux density of metabolic heat. R is the net radiative energy exchange between the surface and its surroundings H is combination of convection and evaporation heat loss from the skin subjected to ambient temperature, C-t is heat transfer by conduction to solid substrate and finally J is the rate of change of heat storage in the body.