Question

Given the spectral emissivity of the aluminum oxide-coated surface shown in the figure, ge vity and the eimisive powver at 1255K. 10.8 1.0 0.98 0.9 0.8 0.78 Step function approximation 0.7 0.6 0.56 Spectral emissivity 0.5 m 0.4 0 2 4 6 8 10 12 14 16 18 20

Answer 1

We have scmissiviy $ Ahe o 56 4- Fom the abore phwe can wite とっ= o.38 vee ss s iven Now The ekns and the abe de lasmined m the table of Bac bodRadbaA chons T 1255 K

Also we have X, = 4 Am So.that L/m.k ג,T= 4x1255 = 5020 , 636 emissivi IS 353-。.636)+0.7(+。.353) The missive pouses is vem as Ste fan Bogmam Constont 4 C1255 o-7014 X 5.67 χι