Hc. Zhou et al., A fast algorithm for calculation of radiative energy distributions received by pinhole image-formation process from 20 rectangular enclosures, NUM HEAT A, 38(7), 2000, pp. 757-773
In the fast algorithm the total energy received by pinhole image-formation
elements is divided into two parts: the direct part and indirect part. The
indirect energy,uas related to the direct part, and the latter was calculat
ed through a concept of effective angle factor for image formation. For 2-D
systems filled with emitting, absorbing, isotropically scattering medium a
nd surrounded by diffusely reflecting wad surfaces, the results through usi
ng the fast algorithm approached the statistical average values of those ca
lculated using the Monte Carlo method and the computation time can be nearl
y 50 times faster.