11 replies to this topic

[nishantril]

could anyone guide me to the procedure for thermal design of shell and tube heat exchanger?

I want to use steam in tube side and air in shell side..!! Also tell me the necessary data.!

[Light]

There are so many nice books on heat exchanger design. You can refer to "Process Heat Transfer" by Kern or Ludwig Volume 3. One suggestion I would like to make here is that you can have fins on the air side. This would substantially increase the heat transfer area on the air side which has a very low heat transfer coefficient compared to steam.

   The required design info and data like thermal conductivity can be found from the handbooks.

 

   Best of Luck.

Edited by samkha, 17 January 2014 - 11:52 AM.

[nishantril]

samkha:

 

I want to heat the air....how would fins make any difference being on shell side...on the other hand the heat gained by air from steam would be lost...

[srfish]

What is the operating pressure on the air side?. This will determine the fin configeration, if needed. For more information on fin technology check out the Wolverine Engineering data book.

[breizh]

http://www.wlv.com/p...ok/databook.pdf

 

To add to the previous posts

 

Breizh

[nishantril]

srfish:

 

pressure on air side is 8 kg/cm²g...n on steam side 1.5 kg/cm²g...according to you sir...which stream should I take in shell ?

[srfish]

I would put it on the shell side.

[fallah]

I would put it on the shell side.

 

srfish,

 

By "it" you meant steam?

[S.AHMAD]

Hi

1. Generally, we normally have higher pressure on the tube side. Unless fouling is critical.

2. In this case, putting air on the tube side is better since in addition to higher pressure the heat transfer coefficient is higher compared to air on shell side and hence result in smaller exchanger size. Heat coefficient for condensing steam is always high whether on the tube side or the shell side. But in this case the heat coefficient of the air is lower than steam and hence it is the controlling factor.

Edited by S.AHMAD, 26 January 2014 - 05:01 AM.

[breizh]

Hi,

Probably the documents attached will help you for your design.

 

Breizh

[nishantril]

Hi,

Probably the documents attached will help you for your design.

 

Breizh

Thank you Sir.

[nishantril]

Hi

1. Generally, we normally have higher pressure on the tube side. Unless fouling is critical.

2. In this case, putting air on the tube side is better since in addition to higher pressure the heat transfer coefficient is higher compared to air on shell side and hence result in smaller exchanger size. Heat coefficient for condensing steam is always high whether on the tube side or the shell side. But in this case the heat coefficient of the air is lower than steam and hence it is the controlling factor.

Thank you sir.