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Typical Overall Heat Transfer Coefficient

exchangers coefficients sulfuric acid

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#1 Mojo142

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Posted 02 April 2018 - 09:50 AM

Hello everyone,

 

I am designing a heat exchanger for the cooling of concentrated sulfuric acid using a shell and tube exchanger, and I was wondering what are the typical overall coefficients for the cooling concentrated sulfuric acid, with water being the cold fluid. I am unable to find any mineral acid values in the books by TEMA, Ludwig, or Richardson.

 

 

Kind regards,

 

M



#2 Pilesar

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Posted 02 April 2018 - 01:09 PM

Unless you find a more specific reference, I would assume behavior similar to hydrocarbons. Temperature and concentration both affect viscosity which will be a big influence. For cooling liquid with no phase change and without other info, I would estimate overall heat transfer coefficient of 40 BTU/hr-ft2-F for 5 cP. I would use double that for 1 cP and use half that value for 10 cP. But you know more about your fluid conditions so don't take my word for it. For a student project, you have references and you should probably use them. Which referenced fluid is most like the fluid you have? Are their several fluids that might be similar? Is there no conservative value that would give you a reasonable design if you are incorrect about the heat transfer coefficient? Cite your references and state your reasons for your professor. Document your assumptions and perform the design.

  If you were taught a method to use fluid characteristics to calculate heat transfer coefficients, then use that. The calculation method may not available until after the initial exchanger design so there will probably be some design iteration required. That is part of the engineer's world, so allow time for it.



#3 Napo

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Posted 06 April 2018 - 11:55 AM

Mojo142,

 

I send related information.

 

Napo.

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#4 Napo

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Posted 08 April 2018 - 09:16 PM

Mojo142,

A recommendation:"The use of air cooling instead of water cooling
is not just due to limited water resources. Often air cooling is much more economical than water cooling." of: USE OF AIR COOLING APPARATUS IN SULFURIC ACID by L. Ya. Zhivaikin, V. M. Shmerkovich, et. al. (November 1971, Chemical and Petroleum Engineering 7(11):1013-1015).

Napo.




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