Heat transfer question-COnvection+radiation

AI Thread Summary
The discussion revolves around calculating the convective heat transfer coefficient for a flat plate exposed to solar radiation. Two methods yield different results: one suggests a coefficient of 50 W/m²°C, while the other indicates 25 W/m²°C. The discrepancy arises from how radiation and convection are accounted for, particularly given that radiation affects only one side of the plate. Most participants lean towards 25 as the correct answer, but one contributor argues for 50 based on the total radiation input. The conversation highlights the need for clarity on the heat transfer principles involved.
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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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I agree with your assessment.
 

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