A horizontal plate is experiencing uniform irradiation on the both upper and lower surface...

A horizontal plate is experiencing uniform irradiation on the both upper and lower surfaces. The ambient air temperature surrounding the plate is 290 K with a convection heat transfer coefficient of 30 W/m2·K. Both upper and lower surfaces of the plate have a radiosity of 4000 W/m2,and the plate temperature is maintained uniformly at 390 K. If the plate is not opaque and has an absorptivity of 0.527, determine the irradiation and emissivity of the plate. Answers: 7000W/m2, 0.525