If in Problem 15.17, the lower surface of the plate is exposed to air with a convective heat transfer coefficient of 3 Btu/h ft F, what steady-state temperature will be reached a. if radiant emission...

If in Problem 15.17, the lower surface of the plate is exposed to air with a convective heat transfer coefficient of 3 Btu/h ftF, what steady-state temperature will be reached

a. if radiant emission from the plate is neglected;

b. if radiant emission from the top surface of the plate is accounted for?

Problem 15.17

The solar radiation incident on a steel plate 2 ft square is 400 Btu/h. The plate is 1.4 in. thick and lying horizontally on an insulating surface, its upper surface being exposed to air at 90F. If the convective heat-transfer coefficient between the top surface and the surrounding air is 4 Btu/h ftF; what will be the steady-state temperature of the plate?