How to Calculate Internal Air Temperature in a Steel Box?

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SUMMARY

This discussion focuses on calculating the internal air temperature of a steel box containing a heat source. The key formula used is Q = Delta Temperature / RT, where Q represents heat flow, Delta Temperature is the difference between the internal and external temperatures, and RT denotes thermal resistance due to convection and conduction. The primary thermal resistance affecting the calculation arises from natural convection both inside and outside the box. Understanding these relationships allows for accurate temperature predictions based on known heat output and ambient conditions.

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  • Understanding of thermodynamics principles
  • Familiarity with heat transfer concepts
  • Knowledge of thermal resistance calculations
  • Basic mathematical skills for manipulating equations
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  • Research natural convection principles in enclosed spaces
  • Learn about thermal resistance in materials, specifically steel
  • Explore methods for measuring internal temperatures accurately
  • Study the effects of varying heat sources on temperature dynamics
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Engineers, physicists, and anyone involved in thermal management or heat transfer analysis in enclosed systems will benefit from this discussion.

CruiserFJ62
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I have a heat source inside a steel box. I know the outside ambient air temp and the amount of heat the source puts of. How do I calculate the internal air temp of the box?
 
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Use the basic relation: Q = Delta Temperature / RT

Q = Heat Flow
Delta Temperature = Temperature (inside box) - Temperature (outside box)
Thermal Resistance = convenction and conduction resistance

Now, the inside of the box will get hot enough (increase in temperature) to get the energy of the heat source out so

Q = heat flow = heat source

Your thermal resistance will be mostly from natural convection inside and outside the box.
 

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