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Thermodynamics question: temperature between layers

  1. Apr 11, 2017 #1
    1. The problem statement, all variables and given/known data

    penguin heat loss question.PNG

    2. Relevant equations
    h = k/d
    1/h (total) = 1/h + 1/h + 1/h... + 1/h (surf)
    Q/t = h A T

    3. The attempt at a solution
    For the thermodynamic one i got up to calculating the total heat transfer coeffecient but i dont know where to go from there as its asking for the outside temperature of the feathers, whilst giving an air temperature (-15 degrees).

    Help would be greatly appreciated ~ Adam
  2. jcsd
  3. Apr 11, 2017 #2


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    Could you sketch the thermal "circuit" showing the temperature points and thermal resistance between each? Think ratios or "potential divider" if familiar with electronics.
  4. Apr 11, 2017 #3
    Hello i tried sketching the circuit but i just cant seem to get it. Is there some sort of 3rd layer between the feathers and air? If so how would i go about finding the temperature of it? Also im not familiar with potential dividers
  5. Apr 11, 2017 #4


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    Look up "surface heat transfer coefficient". The "third layer" as you called it is the surface of the feathers.
    Last edited: Apr 11, 2017
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