3 replies to this topic

[freeman]

Dear All,

 

When we size a heat exchanger it's necessary to check pressure drop and velocity of fluid through tubes and shell.

 

There are lots of information about shell and tube heat exchangers (tube side and shell side velocity and pressure drop) in heat exchanger reference books.

 

But I have not found any criteria for double pipe hear exchangers:

 

1- Allowable Velocity and Pressure drop of fluid inside pipe

2- Allowable Velocity and Pressure drop of fluid inside annulus

 

Thank you in advance

 

Freeman

[breizh]

Freeman,

Get a copy of Process heat transfer By Kern , you should find the answer to your query.

Breizh

[srfish]

Freeman,

 

As with any sizing of heat exchanger equipment, you need to enter the allowable pressure drops. Meeting the maximum allowable drops sets the maximum velocity. But this maximum velocity needs to be evaluated for detrimental effects.

[Robert Montoya]

Hi, Further drop pressure and velocity, is very important verify the UA=22500 Kcal/(hr°C) as the upper economical limit and also verify the vibration of the heat exchange.