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LMTD for CROSS-CURRENT Heat Exchanger

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Phani Y

Chemical
Aug 3, 2019
39
IN
Hi All,

Can someone please let me know how to get dT1 and dT2 for LMTD calculation for a CROSS-CURRENT Heat Exchanger? Is it the same as that of a Counter-Current Heat Exchanger? If it is different, please explain and post any useful links for it.
 
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For cross current flow HX, to get corrected LMTD, see diagram (h), fig 11-4 on page 11-6, chapter of heat transfer equipment, in Perry Chem Engg Handbook, 7th edition.
 
George,

I don't have it with me. Can you please share the book with me? If not the entire book, at least the pages that you mentioned?
 
It's different; a counter-flow HX has pipes running parallel, but the flows are in opposite directions, while a cross-current HX has pipes running perpendicular to each other.

There are a lot of configuration choices, even for cross-flow, so you need to describe your configuration in detail --> number of shells, number of rows, number of passes.

Please do not solicit violations of copyright; this is not condoned here.

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! faq731-376 forum1529 Entire Forum list
 
You can also look up Perry 6th edition for the same. A more detailed illustration may be found in the ever popular "Process Heat Transfer " book by DQ Kern in Fig 16.17 in the chapter on Extended Surfaces.
 
the same counter flow formula is using for cross flow calculation. i attached a excel file of counter flow and co-current. and go to the link cross flow online calculator. the online cross flow calculator follow the same formula to find the LMTD of counter flow.you can check. if something i missed , you can correct me
Link
 
 https://files.engineering.com/getfile.aspx?folder=9dd79de6-dba9-47e7-91de-2104c116c6e5&file=CAL-1#LMTD-FLOW.xlsx
Guys! I need to calculate LMTD for Kettle Type Reboler (TEMA Type - BKU)... Can someone please help me?
 
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