A thin, flat & square plate measuring 2 m × 2 m is freely hanging in ambient air at 25°C. It is exposed to the solar radiation falling on one side of the plate at the rate of 500 W/m2. The plate temperature will remain constant at 30°C, if the convective heat transfer co-efficient is ________________ W/m2 °C ?
Correct answer: B
Explanation
Energy balance requires absorbed solar energy to equal heat loss by convection. The required coefficient is 100 W/m^2°C.