Calculating Heat rise in a Delrin cylinder

[EngineerW]

What I would like to know is how to calculate the rise in air temperature inside a sealed delrin tube. The tube will house a magnetic induction coil that will be radiating a magnetic field whose stength is given in Amps/m2.

The volume of the tube not occupied by the coil or other electronics is filled with air.

I also know the volume of the sealed tube. What I am not sure about is what I need to know of the thermal properties of the delrin material I am using.

Can anyone help with how to calculate this? Ideally what I would like to end up with is a family of curves that describe the temperature of the air in the tube as a function of time and field strength.

Thanks for your help in advance,

EngineerW

 

[25362]

For mechanical and thermal properties of delrin see:

http://www.hpceurope.com/vgb/fichtech/infogenerales/matieres/delrin.html

 

[prex]

This seems to be a quite standard thermal calculation.
If there was no contact between the contained coil and the tube wall you would determine the series resistance of inside convection + tube wall conduction + outside convection. The heat generation is not directly related to the field strength, you should preferably know the wattage consumption of the coil. This would easily give you the equilibrium temperatures. For a time transient you need also the thermal capacity of the coil, that depends on the mass and on the type of constitutive materials.
As I suppose there will be contact between the coil and the tube for supporting reasons, this is possibly the most difficult part of the estimate, as the exchange would not be negligible and would be related to the precise geometry and materials involved.

prex

http://www.xcalcs.com

Online tools for structural design

 

[ko99]

prex is right except that radiation should be included. I suspect the conduction path from coil to delrin is significant. It's not a simple calculation. If you need more help let us know.




ko (

http://www.ecooling.biz)