Configuration factors (also often called shape factors, form factors, view factors, or angle factors) define the fraction of uniformly distributed radiative energy leaving diffuse surface j that is incident on a second surface k. The configuration factor from a differential area element dAj to a second element dAk is denoted by dFdj-dk. In general, such a factor is given by
where the quantities on the right-hand side are shown in Fig. 1.
Figure 1. Defining geometry for configuration factor.
The notation adopted here is that used in Siegel and Howell (2010). The differential form dF for element-to-element configuration factors is used to maintain the differential order of the equation to agree with the differential area on the right-hand side.
Equation (1) can a ...