Heat transfer question-COnvection+radiation

  • Thread starter Caution
  • Start date
  • #1
9
0

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?


 

Answers and Replies

  • #2
20,449
4,357
I agree with your assessment.
 

Related Threads on Heat transfer question-COnvection+radiation

Replies
5
Views
3K
Replies
1
Views
4K
Replies
0
Views
4K
Replies
0
Views
4K
Replies
3
Views
675
Replies
12
Views
11K
Replies
1
Views
916
Replies
1
Views
955
Replies
1
Views
4K
Replies
3
Views
2K
Top