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Overall Heat Transfer Coefficient Equation


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#1 Miguel

Miguel

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Posted 12 February 2016 - 10:24 AM

Hello,

 
I have read the post from http://www.cheresour...sulated-pipe/. 
 
I am trying to develop my own spreadsheet for calculation of a vessel with a cooling water heat jacket. Very similar to the pipe heat loss case only that a convective heat transfer needs to be included for the heat jacket.
 
I have a terrible confusion while writing the formula of Overall heat transfer = U.  I saw that in the file from Proceeng05 first spreadsheet she included all the surface areas for each section of the cylinder, and for the remaining heat transfer calculation Q = DT/U, however for the last sheet,  all surface areas were neglected for the calculation of U, and went with the approach Q=UADT 
how can you arrive to this conclusion ? and why Q = DT/U not used anymore 
 
For me including all the different surface areas for the calculation of overall U is the right way. Only considering 1 surface area Q= UADT assumes that the resistance between all the surfaces is pretty much the same.
 
can you please give me a bit of guidance in which formula for U is the correct one
 
best regards,
yukipilas


#2 breizh

breizh

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Posted 13 February 2016 - 03:16 AM

Miguel ,

Consider the resource attached to support your work .

 

http://checalc.com/s...jacketHeat.html

 

 

Good luck.

 

 

Breizh 


Edited by breizh, 13 February 2016 - 03:35 AM.





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