# Summary

Heat transfer coefficients characterise the transfer of thermal energy in terms of heat flow and temperature difference between two participating media. This article demonstrates how to calculate the radiative heat transfer coefficient and thermal resistance for gray, diffuse radiative exchange.

# Definitions

 : Area of a radiative surface (m2) : Radiative heat transfer coefficient (W/m2.K) : Thermal resistance for radiative heat transfer (W/K) : Temperature of media participating in radiative exchange (K) : Emissivity of a surface : Stephen-Boltzmann constant ( = 5.67 x 10-8 W/m2.K4) Subscripts : Denotes the radiation emitting surface : Denotes the radiation absorbing surface