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Heat transfer question-COnvection+radiation

  1. Oct 23, 2015 #1
    1. The problem statement, all variables and given/known data

    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
    2. Relevant equations

    There are 2 version
    3. 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.




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


     
  2. jcsd
  3. Oct 23, 2015 #2
    I agree with your assessment.
     
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