×
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

Heat Exchanger Retrofit
2

Heat Exchanger Retrofit

Heat Exchanger Retrofit

(OP)
I'm currently investigating the replacement of a steam boiler with localized hot water systems to supply heat to mixing vessels.
I can find the heat transfer coefficient of the current steam set-up but need to determine what would occur if water instead of steam was used as the heating medium. Specifications on the actual mixers is fairly limited.
I was going to use;
Q=m(h1-h2)for steam and equate it to water i.e. Q=m(h1-h2)(for current steam)=mCp(LMTD) (for proposed hot water system)however this leaves me with two unknowns m and LMTD.
Any advise on such matters would be greatly appreciated.

RE: Heat Exchanger Retrofit

I'm curious - what's the perceived advantage going from steam to hot water?

RE: Heat Exchanger Retrofit


Yes, even I was wondering about the same.

RE: Heat Exchanger Retrofit

khanlon,

First, you have not given us much to work with.  A useful  response depends on the overall heat transfer coefficient you now have AND the relative resistance to heat transfer of the steam side, vessel wall, and process side.  Notice, I have assumed you have a jacketed vessel, but do not know for sure.

Good luck,
Latexman

RE: Heat Exchanger Retrofit

to supplement Latexman's response, changing heat source medium from steam to water will impact exchanger size (increase in size).  increase depends upon heat source medium temp.

also, the equation written for proposed hot water system should be mCpDeltaT.  LMTD is used in conjunction with Q in determining overall UA for exchanger at design conditions.

again, insufficient data is provided to provide an adequate response.  suggest obtaining original exchanger data from nameplate as a starting point for sizing replacement exchanger.

good luck!
-pmover

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