(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Consider what would happen to the temp of a solar array when a solar spacecraft gets into an eclipse. Distance to the Sun is 1 AU and F_{s}= 1368 W/m^{2}

Consider an infinitely thin flat panel thermally isolated from the spacecraft. Assume the Specific Heat Capacity is 8.0 Kj/K-m^{2}. Also assume the pamel material has infinite thermal conductivity.

In daylight, the solar array is normally illuminated by the solar radiation, and it quickly reaches equilibrium temp.

Assume panel absorptivity [tex]\alpha[/tex] = 0.84 and it's IR emissivity [tex]\epsilon[/tex]=0.74

(a) Calculate solar panel equilibrium temp under solar normal illumination

(b) Estimate solar panel temp by the end of the longest possible eclipse (71 min)

2. Relevant equations

for (a) T = (_{[tex]\alpha[/tex]}* F_{s}) / (4*[tex]\epsilon[/tex]*[tex]\sigma[/tex]_{SB}) --greek letters not to be superscripted (i.e. [4*e*sig_{SB}])

I have no idea what equations should be used for (b) I have looked at

Q = m*c*[tex]\Delta[/tex]T

Q = e*sigma*A*[tex]\Delta[/tex] T

Q = (A*[tex]\Delta[/tex] T) / H

3. The attempt at a solution

From my calculations I got that the temp = 287.65K

I am completely lost as to where to begin for the temp at the end of the eclipse. Any help or advice would be greatly appreciated.

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# Homework Help: Solar Panel temperature

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