Chapter 12 Radiation Heat Transfer Also Δα = Δε , but the emissivity correction factor is to be evaluated from Fig. 12-38 at T = T s = 600 K instead of T g = 1500 K. There is no chart for 600 K in the figure, but we can read Δε values at 400 K and 800 K, and take their average. At P w /( P w + P c ) = 0.6 and P c L + P w L = 0.07 we read Δε = 0.0. Then the absorptivity of the combustion gases becomes 0.0970 .0 041 .0 056 .0 = − + = α Δ − α + α = α w c g
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