Heat transfer question-COnvection+radiation

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SUMMARY

The discussion centers on determining the convective heat transfer coefficient for a thin flat plate exposed to solar radiation. Two calculations were presented: one yielding a coefficient of 50 W/m²°C and the other 25 W/m²°C. The consensus among three authors favored 25 W/m²°C, while one author supported the 50 W/m²°C conclusion. The correct answer is 50 W/m²°C, as it accounts for the solar radiation of 500 W/m² and the convection effects on both sides of the plate.

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Homework Statement



A thin flat plate 2m×2m is hanging freely in air. The temperature of the surroundings is 25°C. Solar radiation is falling on one side of the plate at the rate of 500 W/m2. What should be the convective heat transfer coefficient in W/m2°C, if the temperature of the plate is to remain constant at 30°C?
A 25
B 50

Homework Equations



There are 2 version

The Attempt at a Solution



First version:500x4=2(hx4x5)
h=50

Second version: 500=hx4x5
h=25

3 authors gave 25 as the answer, while 1 author gave 50 as the answer. I personally felt 50 is the correct solution as radiation is in 500W/m^2 not 500W, also taking into account convection on both sides, with radiation only on one side.

[/B]


Can anyone clarify what is the real answer? Which version should i believe?
 
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