I NEED A FULL SOLUTION ! Given the graph of the spectral emissivity of a diffuse

Question

I NEED A FULL SOLUTION !

Given the graph of the spectral emissivity 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 emmisive power is

E=.3int(EdL) from 0 to3 +.6int(EdL)from 3 to infinity where dL=d(lamda)

=[.3*F(0-3)+.6F(3-infinty)]Eb

=.3*.2733+.6*(-.2733)*5.7*10^-8)*(1000)^4

now E=e*5.7*10^-8)*(1000)^4

so we can find e=emmisivity and E=total emissive power

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