opaque object

Here a generalized 3-D radiation simulation system is developed with Monte-Carlo and Gebhart method. There are two kinds of basic units in the system, which are surface unit for opaque objects and body unit for transparent objects respectively. When the bundles were emitted from certain point or surface with Monte-Carlo method, it would enter into an opaque surface or a transparent body. For the former, it would be reflected and absorbed. However, when the second situation happened, there is the third process named penetration beside above two processes.

In the study of indoor and outdoor thermal environment, the analysis and calculation for radiation are adifficulty when the opaque and half-transparent objects exist together, especially for analyzing theindoor environment for atrium, building with large scale transparent envelope and some half-open areawith plants. The traditional method is hard to deal with the long-wave and short-wave radiation issueswhen several opaque and half-transparent objects exist together, and the accuracy description of thethermal environment becomes a problem.