7 replies to this topic

[Jackwill]

Hello,

 

I am trying to calculate the shell side heat transfer coefficient but I am having difficulty. The fluid is lp steam which condenses with no temperature change. I have looked in a few books which mention the equations needed to calculate this however they have only been for single phase fluids. Could someone point me in the right direction on information for calculating the shell side coefficient for a fluid that changes phase.

 

 

Kind regards,

 

J. Will

[srfish]

Any book with the title "Process Heat  Transfer" , "Heat Transfer Design Handbook, and Ludwig's Applied Process Design for Chemical and Petrochemical Plants.l

Edited by srfish, 06 March 2016 - 12:12 PM.

[breizh]

http://www.wlv.com/p...data/db3ch7.pdf

 

Consider this resource . On top of advice given , you may consult our good friend Google.

 

Note : from my old notes , it's mentionned correlations from Colburn and Kirkbride &Badger

 

Breizh

Edited by breizh, 06 March 2016 - 07:28 PM.

[Jackwill]

Thanks, I was not looking under condensation which is why I was having difficulty. Occams razor.

[latexman]

I have had good results applying the "Dukler plot" to condensation heat transfer.  My Perry's has it.

 

I have also seen several very experienced heat transfer designers simply assign a conservative high value, like 1000 Btu/(hr*ft^2*F) to the individual steam condensation heat transfer coefficient, but I'm not suggesting you be so bold.  Calculate it.

Edited by latexman, 06 March 2016 - 09:24 AM.

[Jackwill]

Following on from this, what would be the most appropriate type of shell for this? I was thinking of using an E-type shell as its the most common but is it well suited for fluids with phase change? Not sure whether to use E or G type.

Edited by Jackwill, 12 March 2016 - 11:54 PM.

[Pilesar]

I think it will be impossible for you to condense steam with no temperature change. Condensate will have a few degrees of subcooling at a minimum. If you describe your temperatures, pressures, cooling medium, flow rates, etc, you might get suggestions for design. Consider whether you have air that is mixed with the steam which is common for power plant surface condensers.

[Jackwill]

I think it will be impossible for you to condense steam with no temperature change. Condensate will have a few degrees of subcooling at a minimum. If you describe your temperatures, pressures, cooling medium, flow rates, etc, you might get suggestions for design. Consider whether you have air that is mixed with the steam which is common for power plant surface condensers.

 

Hi thanks for your response. Do you think it would be a valid assumption to negate the subcooling as insignificant?