The Radiation Distribution Factor for Diffuse-Specular Gray Surfaces


This chapter introduces the concept of the radiation distribution factor, defined as the fraction of power emitted from one surface of an enclosure that is absorbed by another surface due to direct radiation and to all possible reflections. The distribution factor can be thought of as the sensitivity of the heat absorbed by a given surface to the heat emitted from any other surface. Thus, it can be used not only to compute the distribution of heat throughout an enclosure due to radiation, but also as a design tool targeting selected surfaces to determine their relative exposure to radiative heating. We consider enclosures composed of diffuse-specular gray surfaces; firstly, because of their pedagogical importance and also because of their relevance in preliminary design.

3.1The Monte Carlo Ray-Trace (MCRT) Method and the Radiation Distribution Factor
3.2Properties of the Total Radiation Distribution Factor
3.3Estimation of the Distribution Factor Matrix Using the MCRT Method
3.4Binning of Rays on a Surface Element; Illustrative Example
3.5Case Study: Thermal and Optical Analysis of a Radiometric Instrument
3.6Use of Radiation Distribution Factors for the Case of Specified Surface Temperatures
3.7Use of Radiation Distribution Factors When Some Surface Net Heat Fluxes Are Specified

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