Modelling of heat transfer by radiation

Abstract

Heat transfer by radiation is something you experience everyday: when walking outside in the sun or when cooking your diner. This thesis provides understandable models of the role that radiation plays in the transfer of heat. By studying literature we developed a mathematical basis for the heat transfer model, where we discuss diffusive, convective and radiative heat transfer, the weighted sum of grey gases and the chosen solving method: the discrete ordinates method. Using CONVERGE CFD and MATLAB software, we present several one- and threedimensional simulations of a furnace in which we consider different conditions. The overall conclusion is that radiation transports heat from places with high temperatures to their cooler surroundings, where also conditions as isolation, wall emissivity and gas mixture play an important role.