Temperature ballance, two systems

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Discussion Overview

The discussion revolves around a problem involving a glass cylinder containing a 100W heat source, with the aim of determining the temperature at which the air inside the cylinder stabilizes and reaches thermal equilibrium with the surrounding environment. The context includes considerations of material selection for the cylinder and the heat transfer mechanisms involved.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant seeks advice on calculating the stabilization temperature of air in a closed glass cylinder with a heat source.
  • Another participant questions whether the problem is related to classwork.
  • A participant clarifies that the problem is part of a real project, emphasizing the need to select appropriate materials for the cylinder.
  • There is a request for clarification regarding the location of the air within the cylinder and a request for a diagram to better understand the setup.
  • Another participant inquires about the dimensions and thickness of the cylinder, suggesting it resembles a light bulb.
  • A participant notes that if the cylinder is not too long, heat transfer may primarily occur through radiation, potentially simplifying the problem.

Areas of Agreement / Disagreement

Participants have not reached a consensus on the specifics of the problem, including the dimensions of the cylinder and the heat transfer mechanisms involved. Multiple viewpoints and questions remain unresolved.

Contextual Notes

There are limitations regarding the assumptions about the cylinder's dimensions and the specifics of heat transfer mechanisms, which have not been fully addressed in the 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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