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Help With Designing Shell And Tube Design

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#1 BabyKFC


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Posted 12 June 2024 - 08:06 AM

Hello, I am a student currently designing a shell and tube heat exchanger. The task is to design a heat exchanger to cool a stream from 81.8 to 30 degree celcius using cooling water from 20 to 40 degree celcius. I am currently facing troubles trying to meet the actual/required ratio of 1-1.3, getting ratios of less than 1. I have tried maximising my tube length and using the maximum guessed overall heat coefficient (250-750 W/m2.C) but the highest ratio I have obtained is 0.6. I am unsure of what to change further, please advise me if possible. I have attached the TEMA sheet below.

Attached File  TEMA2.pdf   42.57MB   22 downloads 

Attached File  TEMA1.pdf   42.67MB   32 downloads

#2 Pilesar


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Posted 12 June 2024 - 04:51 PM

The exchanger is undersized. Try a 40 inch shell instead of a 20 inch shell as a starting point. After you get enough surface area, you need more tweaks. The baffles are very close. See how spacing them further out affects results. Try opening the baffle cut also. Confirm no fouling factor is correct. Normally, cooling water fouls over time. Heat exchanger design is an iterative process.

#3 breizh


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Posted 12 June 2024 - 09:29 PM


Consider the resources attached to support your work.

Good luk


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#4 shvet1


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Posted 12 June 2024 - 11:00 PM

1/ Start with auto design mode, then modify the design proposed by software

2/ using cooling water from 20 to 40 degree celciusLookslike a mistake. What region is this cooling tower located? 

3/ Most properly designed cooling towers I have encountered had dT = 8-10°C. 20°C looks like an overkill.

Edited by shvet1, 12 June 2024 - 11:14 PM.

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