I need details with answers Given the graph of the spectral emissitivity of a di

Question

I need details with answers

Given the graph of the spectral emissitivity of a diffuse, with a surface known to be opaque below .... Find the total emissivity, epsilon and the emissive power, E of the surface at T=1000K. Plot the spectral reflectivity, p lambda of the surface Find the total absorptivity, alphas of the surface under solar radiation. Find the equilibrium temperature of the surface when it is exposed to 1200 W/m2 of solar irradiation with negligible convection. Hint: The equilibrium temperature is expected to be in the range 300K

Explanation / Answer

a)total emissivity=0.3*f(0-3micro m)+0.6*(1-f(0-3micro m)),

f(0-3micro m)=3*10^-6*T=3*10^-6*1000=3*10^-3 ,

hence total emissivity=0.3*3*10^-3+0.6(1-0.003)=0.5991 ans

d)Q=0.5991*5.67*10^-8*T^4=1200

T=433K

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