Weighted-sum-of-gray-gas

Polynomial gas property models [139, 140, 141] as well as the weighted-sum-of-gray-gas models [142-155] have been studied extensively. All of these models are for predicting the gas radiation along a homogeneous line of sight (i.e., constant pressure and temperature). 

Absorption Coefficient Based Gas Properties. In the gas models discussed above, the final product is the band absorptance and total emissivity or absorptivity. For most radiative transfer models, however, the absorption coefficient is the desired input. For this purpose, either polynomial expressions or the weighted-sum-of-gray-gases (WSGG) models are developed, which are usually based on the pseudo absorption coefficient concept [35] ... 

For the WSGG clear gas components we denote SS ]K 0 = SSQ an( Sf K o = SG0 = 0. Finally the WSGG arrays of directed exchange areas are computed simply from a-weighted sums of the gray gas total exchange areas as... 

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