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Converting Thermal Conductivity to Thermal Conduction/Resistance 
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#1
Aug1209, 09:12 AM

P: 31

Hi all
I want to convert thermal conductivity to thermal conductance. The problem is with the units. for thermal conductivity the units are [W/(m.K)] and for thermal conductance the units are [W/K] For E.g for copper thermal conductivity is 400[W/m.K] how can I convert it to thermal conductance?Can it be simply by multiplying it my the length of the copper wire I am using? Any help with be really appreciated. Thanks and Regards Hamza 


#2
Aug1209, 10:29 AM

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P: 26,148

Hi Hamza!
You can always rely on the units … just multiply by the length (in metres) … "/m" means exactly what it says 


#3
Aug1209, 06:16 PM

P: 44

hmm.. I think you need to multiply by the crosssectional area and then divide by the length. The conductance should decrease with increased length and increase with larger area.
Consider if you add a second wire of equal size. You would expect the conductance to increase by a factor of 2 (and resistance drop by a factor of 2). 


#4
Aug1309, 02:20 AM

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P: 26,148

Converting Thermal Conductivity to Thermal Conduction/Resistance
(I thought the thermal conductivity was of the wire, but I see now it's of the material … see http://en.wikipedia.org/wiki/Thermal_conductivity) 


#5
Aug1309, 09:23 AM

P: 31

Thanks all...
very much appreciated. I have a further query now which I have posted separately. hxxp://www.physicsforums.com/showthread.php?t=330491 


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