Calculation of temperature control in enclosures


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Old 10-09-12, 10:36 AM
U
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Calculation of temperature control in enclosures

I try to calculate a temperature control in enclosure by methodic below.
http://www.axisindia.in/pdf/axis-ste...emperature.pdf

How to calculate heat transfer coefficient k [W/m K] of enclosure material like: 1. polypropylene (thermal conductivity 0.11 [W/m K]) and aluminum composite (thermal conductivity ~ 0.3 [W/m K]) ?

Thank you
 
  #2  
Old 10-09-12, 12:07 PM
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Hi uniuu, and welcome to the forum,
One of the weaknesses we have here in the states is not being comfortable with the metric terms, especially with old folks like myself. I have to convert everything to btu's, F�, and ft�. So forgive me if I'm a little slow catching up with your question.

If I understand your question, you have a box made out of aluminum and insulated with a layer of polypropylene. I believe the (W/m K) is actually (W/m� K), the (�) symbol is often omitted. In any case, to add those thermal coefficients (we call them U-factor) you would invert each and add the results and then invert your answer. This would give you a single thermal factor to apply to the entire area of the box.

Does that help? I can study the units a bit more to be sure if needed.

Bud
 
 

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