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Thermodynamics? number crunching thermal conductivity 
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#1
Feb514, 05:56 PM

P: 24

I am working on some basic calcs for heat transfer from polyethylene pipe. My numbers are not working out right so I need a little refresher.
The PE pipe would have a TC of about .46 W/(m.*C). to get to BTU/(hr.ft.*F), I mult by .5779 to get .266. Assuming 10sf of PE pipe, and lets say a dT of 10*F, how do I arrive at my BTU/hr? Wall thickness of piping is .120" but I am told that does not matter. IIRC, the unit is actualy per sf PER ft so I might actually divide by my thickness which gets me closer at around 2.22 BTU/hr/sf*F of pipe? 


#2
Feb514, 06:50 PM

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PF Gold
P: 5,056

[tex]Q=\frac{k}{d}ΔTA[/tex] where d is the wall thickness. 


#3
Feb514, 06:57 PM

P: 24

I guess I am second guessing the units here. Would you mind applying the math to my above figures? Would this indeed be
k=.266 d=.120 k/d = 2.22BTU? 


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