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Question: a solar collector receives 880 wm2 its surface temperature is...

Question details

A solar collector receives 880 W/m2. Its surface temperature is 60°C. The back side is to be
insulated so that back losses are limited to 15%. Insulating material with a thermal conductivity
of 0.05 W/mK is available. The atmospheric temperature is 30°C and the convection coefficient
on the back side is 5 W/m2K. Determine the insulation thickness.

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