A 1 m square copper plate is placed horizontally on 2 m high legs. The plate has been coated with a material that provides a solar absorptance of 0.9 and an infrared emittance of 0.25. If the air temperature is 30?C, determine the equilibrium temperature on an average clear day in which the solar radiation incident on a horizontal surface is 850W/m2.GIVENA horizontal copper plate in airPlate dimensions (s x s) = 1mx 1 mSolar absorptance (αs) = 0.9Infrared emittance (ε) = 0.25Air temperature (T??) = 30?C = 303 KIncident solar radiation (qs/A) = 850 W/m2ASSUMPTIONSThe sky behaves as a black body at 0 KThe effect of the legs is negligibleAir is quiescentRadiative heat transfer from the bottom of the plate isnegligible

,-? . - 30 Alr 1 m 1 m