Solar radiation is incident on the front surface of a thin plate with direct and diffuse components of 300 and 250 W/m², respectively. The direct radiation makes a 30° angle with the normal of the surface. The plate surfaces have a solar absorptivity of 0.63 and an emissivity of 0.93. The air temperature is 5°C and the convection heat transfer coefficient is 20 W/m²·K. The effective sky temperature for the front surface is -33°C while the surrounding surfaces are at 5°C for the back surface. Determine the equilibrium temperature of the plate.

Transcribed Image Text:

Air Talr = Tsurr = 5°C Tsky =-33°C Gsolar aconv Фсопy Grad,sky Plate az= 0.63 e= 0.93 drad.surr áconv