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Overall Heat Transfer Area In Htri

shell & tube heat exchanger

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#1 erwinfs

erwinfs

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Posted 29 May 2018 - 11:03 PM

Dear All,

 

I was once using HTRI in my college for shell & tube heat exchanger sizing excercise. When I checked the datasheet, there are "Actual U" and "Required U" terms in the datasheet. 

I currently still can't find satisfying explanation about "Actual U" and "Required U" terms in this software.

 

Can anyone explain about this?

 

Thank You



#2 Pradeepy

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Posted 30 May 2018 - 11:23 PM

Actual U is based on heat transfer area provided or heat transfer area provided including overdesign.
And U required means heat transfer area provided in case of overdesign factor is zero percent

Edited by Pradeepy, 30 May 2018 - 11:25 PM.


#3 kingnumberone

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Posted 02 February 2019 - 07:05 AM

Heat transfer through a surface like a wall can be calculated as

q = U A dT                        (1)

where

q = heat transfer (W (J/s), Btu/h)

U = overall heat transfer coefficient (W/(m2K), Btu/(ft2 h oF))

A = wall area (m2, ft2)

dT = (t1 - t2)

     = temperature difference over wall (oC, oF)

You can find the review article example,

as well as more details about Overall Heat Transfer on this site https://www.engineer...ient-d_434.html.

heat_transfer.jpg



#4 kingnumberone

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Posted 02 February 2019 - 07:06 AM

This calculator can be use to calculate the overall heat transfer coefficient and the heat transfer through a multi-layered wall. The calculator is generic and can be used for metric or imperial units as long as the use of units is consistent.






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