New method of radiative transfer coefficient between unit surfaces

By decomposing the transfer process of irradiance energy, the relation between radiative transfer coefficient and angle factor was built, and the new method for computing radiative transfer coefficient between unit surfaces was developed. The new method is only applicable to unit surfaces that owned the character of diffuse emission and diffuse reflection. The effects of the radiation and geometric characters of unit surface were decomposed. The new method and Monte-Carlo method were respectively used to compute the radiative transfer coefficient between unit surfaces inside cube. The computation time and accuracy of the two methods were theoretically analyzed and compared. It shows that the computation time is less than the time Monte-Carlo method needs, and that it is not influenced by surface absorptivity. Compared with Monte-Carlo method, the new method has the higher accuracy.