ABSTRACT
This chapter begins with a discussion of the analysis of radiation exchange in an enclosure where all surfaces are black, so that no reflections need to be considered. The relation for exchange between two surfaces is applied to multiple surfaces, each at a different uniform temperature, in an enclosure of black surfaces. The geometric configuration factors can then be used for the enclosure analysis. Each enclosure surface can have a specified net energy flux added to it by some external means, such as conduction or convection, or it can have a specified surface temperature. In some instances, an analysis assuming diffuse-gray surface areas may not yield good results. For example, if the temperatures of the individual areas of the enclosure differ considerably from each other, then an area will be emitting predominantly in the range of wavelengths characteristic of its temperature, while receiving energy predominantly in different wavelength regions.
