Thermodynamics? number crunching thermal conductivityby fastline Tags: conductivity, crunching, number, thermal, thermodynamics 

#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

Sci Advisor
HW Helper
Thanks
PF Gold
P: 4,505

[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? 



#4
Feb514, 09:49 PM

Sci Advisor
HW Helper
Thanks
PF Gold
P: 4,505

Thermodynamics? number crunching thermal conductivity 


Register to reply 
Related Discussions  
Thermodynamics  Thermal Conductivity + Heat Flow  Introductory Physics Homework  7  
Stellar physics (number crunching)  Advanced Physics Homework  0  
Derivation of electrical conductivity, Seebeck coefficient and thermal conductivity  Advanced Physics Homework  0  
Number crunching machine on a small budget?  Computers  11  
Converting Thermal Conductivity to Thermal Conduction/Resistance  Electrical Engineering  4 