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The horizontal roof of a building has an emittance of 0.9. Air temperature is 1oC on a clear night. Sky acts as a black radiation

The horizontal roof of a building has an emittance of 0.9. Air temperature is 1oC on a clear night. Sky acts as a black radiation sink at -60oC. If the underside of the roof is well insulated, estimate the roof temperature. Assume a convective heat transfer coefficient of 5 W/m2 K.

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