The weather channel reports that it is a hot, muggy day with an air temperature of 90°f, a 10 mph breeze out of the southwest, and bright sunshine with a solar insolation of 400 w/m2. consider the wall of a metal building over which the prevailing wind blows. the length of the wall in the wind direction is 10 m, and the emissivity is 0.93. assume that all the solar irradiation is absorbed, that the surroundings are at tsur = 85°f, and that flow is fully turbulent over the wall. estimate the average wall temperature.