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Overall Heat Transfer Coefficient

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#1 T_bag


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Posted 16 April 2024 - 07:49 AM



I am in the process of determining the overall heat transfer for a HC gas system (mostly C1-C4) at around ~720-750 PSIG. I am trying to estimate overall heat transfer coefficient b/w the following utilities.


1. Heating Utility 

    a. HP Steam

    b. Hot Oil


2. Cooling Utility 

    a. Cooling water

    b. Refrigerant 


i. Note :- Someone told me that HP steam & Refrigerant are going to have a same U value, as both are going to have a phase change (Steam from vapor to liquid & Refrigerant from liquid to vapor). bit confused why it would happen ?

ii. I am of the opinion that steam is obviously going to have a higher heat transfer coefficient than Hot oil or cooling water, but my colleague are making me bit confused as they had used higher U values for Hot oil in their past projects and currently I don't have any reference against their values.


Let me know if anyone can suggest estimate U values or some reference based on the Industry experience. 

Edited by T_bag, 16 April 2024 - 10:31 AM.

#2 latexman


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Posted 16 April 2024 - 08:11 AM

Perry's has estimated U values based on service and fluid state.  You should find what you need there.


Another reference for estimated U values is Kern's Process Heat Transfer.

#3 breizh


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Posted 16 April 2024 - 10:42 PM


On top of the resources proposed by latexman , consider the document attached.

I don't know who someone is, better to use references in literature.


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