×
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

expansion tank

expansion tank

expansion tank

(OP)
Is there any rule of thumb for determining the size of a diaphragm expansion tank for a simple closed loop water/glycol coolant system. (ie by a certain percent of total volume, or by anything else???)

RE: expansion tank

Go on line and type "sizing diaphragm expansion tanks".  Engineeringtoolbox will come up.

RE: expansion tank

Sizing an expansion tank depends on several variables, and there are generalized rules for typical systems, but unless you know the assumptions that went into the "rule of thumb", you can get very incorrect answers.  Mark's Handbook has such a "rule of thumb", but it is only good for a specific number of boundary conditions, few of which are adequately defined.

For example, some water/glycol systems will fill the expansion tank when system temperature goes up, and other systems will actually experience a decreasing expansion tank inventory as the system is heated.

This all depends on the nature of the system fluid, the piping system, the temperature extremes, the pressure changes, etc.   

RE: expansion tank

Check out ASHRAE HANDBOOK - SYSTEMS volume.

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