Radiation Transfer Through Specular Passages. I. Diffuse Incident Radiation.

摘要

A new technique is developed for calculating exchange factors for specular radiation passages of high reflectivity rho. It is shown that for a large class of configurations,even with curved reflector surfaces,the average number of reflections (n) can be calculated by a simple analytic formula and without any ray tracing. The exchange factor can then be approximated by rho/sup (n)/. The method is illustrated by many examples,including V-troughs and compound parabolic concentrators which are relevant for solar energy collection. The rho implies l limit of radiation cavities can be treated in a similar manner.