×
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

Design Temperature of Heat Exchangers

Design Temperature of Heat Exchangers

Design Temperature of Heat Exchangers

(OP)
Hi, cold you tell me  what are the criteria and method to selected value of Design Temperature, on calcultaions of diferent parts of a heat exchangers (under TEMA and ASME Sec. VIII, Div1 & Div.2)?

Thanks,

RE: Design Temperature of Heat Exchangers

Wrl69:

Basically, the heat exchanger design temperatures are usually "user input".  In other words, the person ordering the heat exchanger tells the designer "My maximum hot temperature is this ..., my maximum cold temperature is this ..., the heat I need removed is this ...".  If you're trying to figure out the design temperatures on an existing heat exchanger, see if you can find the spec sheet for it.  It will usually have the temperature ranges.  

Patricia Lougheed

Please see FAQ731-376 for tips on how to make the best use of the Eng-Tips Forums.

RE: Design Temperature of Heat Exchangers

The question is a little broad and as VPL states the end user should generally specify the design temperatures.  However, because there is some doubt in my mind as to what your question is really asking.  I have provided you with three answers that do overlap a little.

A shell and tube heat exchanger has two sides, namely shell and tube, and therefore two design temperatures.

Anything that is in contact with the tube side shall be designed to the tube side temperature.  Anything that is contact with the shell fluid side shall be designed to the shell side temperature.  Some items are in contact with both shell side and tube side fluids shall be designed for the hotest (and coldest) design temperatures.  These items include tubes and tubesheet.  Think about what temperature a item could get up to if shell side fluid stops and then if the tube side fluid stops, that should help you.

Alternatively, you may be asking the question - how do you calculate the tube and shell temperature to enable to work out the expansion in different scenarios.  This needs to direction from the purchaser, they are the ones who know the impact of failures eg say cooling water failure.  Specific items to consider are start up, loss of fluid on one side etc.

Thirdly, are you asking about items of a shell and tube heat exchanger need to be designed for elevated temperature to ASME?  Answer anything that retains pressure - therefore you do not need to design the baffles, impingement plates, tie rods, spacers etc.  However you do need to consider the material suiability at the temperatures they will encounter.

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