Abstract
View factors (or configuration factors, or shape factors), which are generally used to describe radiation exchange between diffuse surfaces, are introduced in this chapter. Following the derivation of the definition of a view factor, two approaches to calculate view factors are presented, namely, direct area integration and contour integration. View factor relationships (algebra), stemming from basic energy conservation, are also derived and demonstrated through examples. Several methods that allow convenient evaluation of view factors, such as the crossed-strings method, the inside sphere method, and the unit sphere method are presented, along with examples on how to apply these methods in practical situations. Finally, a formulation to compute view factors between arbitrary planar polygons is outlined and demonstrated.
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