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. 100
- A. 50
- B. 100
- C. 150
- D. 200
Explanation
At steady temperature, absorbed radiation equals convection: q'' = h(Ts − T∞). Therefore h = 500/(30 − 25) = 100 W/m²·°C, assuming the incident radiation is absorbed.
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