×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Condensor

Condensor

Condensor

(OP)
Hi All,
I have a generall question. In process plants, we noramlly use the condensor to extract the heat from the system exhasts. What is criteria for selection if someone should design a condensor on these location? Any limit on the energy saving with these condensors??
Thanks in advace for your help on the issue.
BR
Zamu

RE: Condensor

If you're using the energy from the exhaust to heat a process stream then you could be limited by the process stream's maximum temperature or by the amount of heat that economically feasible to remove.  Most of the time, start with a 10 F approach.

RE: Condensor

(OP)
Hi Ducan 8943,
Thanks for your reply.
Do you mean with delta T of 10 F, the process of heat recovery would be economical??
My concern is the economical heat removel from the vapour/liquid streams. some times to recover heat you need huge amount of cold medium (to remove heat, Like combined heat and power idea in power plants). Is there any ctiteria to say when it will be feasible to do the heat integration of hot stream in the plant.
Any suggestions???

RE: Condensor

banu...

"In process plants, we noramlly use the condensor to extract the heat from the system exhasts"

Yes....if you are condensing steam from a turbine and want to ensure the maximum transfer of energy form the steam into mechanical power. Superheated steam is commonly used in this application.

If you use the steam in order to heat something...use saturated steam...

I do not understand the rest of your question.....

-MJC

   

RE: Condensor

zamu,

Yes.  If you are trying to extract maximum work out of your turbines, you want to design your condensers to have the lowest back pressure possible for your turbines to exhaust into.  It is a function of your cooling water source.  

Also, steam normally has some non condensables in it and a turbine condenser will have to be designed with a separate section especially designed to remove any non condensables.

Also, if you are reusing the condensate in your boilers, you want as little subcooling of the condensate as possible, as all subcooled condensate ultimately has to have energy added back to it to bring the water back to the boiling temperature in the boiler (or deaerator).

Condensers are heat exchangers, but not all heat exchangers are condensers.  Don't be fooled.

MJC, I didn't understand your " yes..." answer at all.  What does the use of superheated steam have to do with condenser selection?  Please elaborate.

rmw

RE: Condensor

(OP)
Thanks for your replies guys.
I am afraid i could not follow the idea of having lowest back pressure in condensers for turbines.
How is the function of cooling water source??

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources