Thermodynamics question: temperature between layers

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Homework Help Overview

The discussion revolves around a thermodynamics problem related to heat transfer, specifically focusing on calculating temperatures between layers, including feathers and air at a specified temperature of -15 degrees Celsius.

Discussion Character

  • Exploratory, Assumption checking, Conceptual clarification

Approaches and Questions Raised

  • The original poster attempts to calculate the total heat transfer coefficient but is uncertain about determining the outside temperature of the feathers. Some participants suggest visualizing the problem through a thermal circuit diagram, while others question the existence of an additional layer between the feathers and the air.

Discussion Status

Participants are exploring different interpretations of the problem, with some guidance provided regarding the concept of a surface heat transfer coefficient. There is no explicit consensus on the approach to take, and the discussion remains open-ended.

Contextual Notes

The original poster expresses confusion about the setup and the potential existence of a third layer, indicating a need for clarification on the assumptions involved in the problem.

Adam Rabe
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Homework Statement



penguin heat loss question.PNG


Homework Equations


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

The Attempt at a Solution


For the thermodynamic one i got up to calculating the total heat transfer coeffecient but i don't 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
 
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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.
 
CWatters said:
Could you sketch the thermal "circuit" showing the temperature points and thermal resistance between each? Think ratios or "potential divider" if familiar with electronics.
Hello i tried sketching the circuit but i just can't 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 I am not familiar with potential dividers
 
Look up "surface heat transfer coefficient". The "third layer" as you called it is the surface of the feathers.
 
Last edited:

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