overall heat transfer coefficient value 4

[pmoneysh]

Hello experts!!
Is it possible to obtain overall heat transfer coefficient value (roughly) without experiment for a reactor with cooling jacket?

My approach to estimate U value by designing shell and tube heat exchanger using process simulator but the value was quite high than our expectation.

Thank you.

 

[MortenA]

In most cases heat transfer will be limiting on one side. For a jacketed vessel most likely on the vessel side. So you assumptions re. the Nu number on the inside of the vessel will probably dominate the overall U value. A S&T calculation will probably give a high Nu on both sides . Agitation in the reactor will impact Nu.

CHECALC has a "jacket vessel heat transfer" calculator (i know and like other of their calculator but are not familiar with this one):

https://www.checalc.com/solved/jacketHeat.html

--- Best regards, Morten Andersen

 

[pierreick]

Hi,
You may want to perform some calculations, consider the document attached.
Pierre

 

[pierreick]

Hi,
Another document. This will help to confirm the results from the calculator.
Good luck
Pierre

 

[pmoneysh]

Thank you Mortena and Pierreick for the suggestions. I will do the calculations Both comments are really helpful

 

[johnnygeneric]

pmon, I found a website that goes through various calcs and also has a table for typical heat transfer coefficients for agitated vessels.

https://www.thermopedia.com/content...A typical overall coefficient for,600 Wm2K−1.

 

[EdStainless]

When you did the simulation did you use the very very low flow velocity that you have in the jacket?
This leads to very high boundary layer resistance.
The above references should get you much closer.


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P.E. Metallurgy, consulting work welcomed

 

[Iomcube]

@ pierreick
Great post, can you provide any similar document for vacuum pump sizing, Noncondensable load calculation...