The spectral absorptivity of aluminum coated with a thin
Chapter , Problem 12.139(choose chapter or problem)
The spectral absorptivity of aluminum coated with a thin layer of silicon dioxide may be approximated as ,1 0.98 for c and ,2 0.05 for c where the cutoff wavelength is c 0.15 m under normal circumstances. (a) Determine the equilibrium temperature of a flat piece of the coated aluminum that is exposed to solar irradiation, GS 1368 W/m2 on its upper surface. The opposite surface is insulated. (b) The cutoff wavelength can be modified by varying the coating thickness. Determine the value of c that will maximize the equilibrium temperature of the surface. 12.140 Co
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