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Heat Exchanger


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#1 process101

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Posted 15 July 2008 - 09:35 AM

Hi every one:
Can any one tell me that how pressure drop in tube side and shell side in heat exchanger is effected by baffle cut, central spacing, tube length, OD, Pitch etc.
Thank you very much in advance.

#2 Art Montemayor

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Posted 15 July 2008 - 10:04 AM

Process:

I can't practically tell you HOW the pressure drops in a shell & tube heat exchanger are affected here in a Forum. I CAN tell you that the pressure drops ARE affected on how you assemble/design a heat exchanger. And the basic information can be readily found in:

1. Don Kern's classic book, "Process Heat Transfer";
2. Ernie Ludwig's classic tomes, "Applied Process Design for Chemical & Petrochemical Plants".

Read them both and find out all the details. When you see the size and pages in each of the above books, you'll understand the reason we can't tell you here in the Forums.


#3 process101

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Posted 15 July 2008 - 10:25 AM

Thank you Mr. Art
I have "Process Heat Transfer" book. but i don't what chapter to i have to read.
because the size of the book is very big. any how i will definitely read that book
thank you very much once again

#4 djack77494

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Posted 16 July 2008 - 07:58 AM

QUOTE (process101 @ Jul 15 2008, 06:35 AM) <{POST_SNAPBACK}>
Can any one tell me that how pressure drop in tube side and shell side in heat exchanger is effected by baffle cut, central spacing, tube length, OD, Pitch etc.


Pressure drop through the tube side of an exchanger can be considered to be like hydraulic losses through piping. You have a similar situation in an exchanger, with the tubes being "pipe-like". Thus, of the parameters you mentioned, only tube length and OD impact the tube side pressure drop. They, of course, are analogous to pipe length and size in ordinary piping hydraulic calcs.

Shellside hydraulics are much more complicated. Simply put, the baffle cut and spacing, along with the length of the exchanger, define the fluid path through the exchanger's shellside. Tubes impede this flow, and thus the number of tubes, their OD, and the pitch (layout) are important in calculating how much the tubes impede the fluid flow.

This is about all that can be readily described regarding this very complex subject. Now go and read, starting with the excellent sources recommended by Mr. Montemayor.




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