A 0.2 m × 0.2 m street sign surface has an absorptivity of 0.6 and an emissivity of 0.7. Solar radiation is incident on the street sign at a rate of 200 W/m², and the surrounding quiescent air is at 25°C. Determine the surface temperature of the street sign. Assume the film temperature is 308C.

Transcribed Image Text:

ε = 0.7 α = 0.6 Air, 25°C