Temperature ballance, two systems

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SUMMARY

The discussion focuses on determining the temperature stabilization point of air within a glass cylinder containing a 100W heat source, which is centrally located and uniformly radiates heat. The cylinder is insulated at both ends, and the user is evaluating materials such as PMMA and glass for construction. Key considerations include the dimensions of the cylinder and the dominant heat transfer mechanism, which is expected to be radiation if the cylinder is not excessively long. The user seeks guidance on achieving thermal equilibrium between the internal and external environments.

PREREQUISITES
  • Understanding of heat transfer principles, specifically conduction and radiation.
  • Familiarity with thermal equilibrium concepts.
  • Knowledge of material properties, particularly thermal conductivity and safe temperature limits.
  • Basic skills in thermal modeling or simulation tools.
NEXT STEPS
  • Research thermal modeling techniques for cylindrical geometries.
  • Learn about the thermal properties of PMMA and glass, focusing on their heat resistance.
  • Explore heat transfer equations, particularly those related to radiation in enclosed spaces.
  • Investigate methods for measuring temperature stabilization in closed systems.
USEFUL FOR

Engineers, product developers, and researchers involved in thermal management, material selection, and heat transfer analysis will benefit from this discussion.

newguy1199
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Hi, I would like to ask you for advice with a problem, I'm working on.

I have a regular shape object (glass cylinder) in which is the 100W heat source. The heat source is ind the middle of cylinder and radiates heat uniformly throughout it’s height. Heat, of course, gradually moving into surrounding area. Thy cylinder is closed on both ends by heat insulating material. I need to know the temperature at which the air in the cylinder stabilizes and there is a temperature balance between inner and outer space. Please help as I should come to a result. Thank you and please pardon my english.
 
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Is this class work?
 
No, It is real problem I want to solve - I'm trying to develop and later produce something, but I need to determine a proper material for cylinder (right now i consider using PMMA or glass), because of low safe temperature point of PMMA. Thats it
 
Where is the air located? Can you provide a diagram?
 
How big and how thick is the cylinder? Sounds like a light bulb to me...
 
diagram.jpg


https://ibb.co/nPBMov
 
Last edited:
Did I miss the length?

If it isn't too long, the heat transfer will be dominated by radiation and the problem can be made easy...
 

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