×
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

Screw compressors intermediate pressure estimation

Screw compressors intermediate pressure estimation

Screw compressors intermediate pressure estimation

(OP)
Hello,

I'm trying to create an excel sheet where I can simulate screw compressor but I can't understand how to estimate intermediate pressure.

I've tried using pi=(p1*p2)^.5 with no results.

I've also tried using intermediate Vi without success.
pi=p1*Vi^k

The situation gets worse if I try with partial load where intermediate pressure is close to suction pressure (because of slide valve opening).

Is there any equation???

Thanks in advance

RE: Screw compressors intermediate pressure estimation

You might look through some of te work by Stosic at City University of London

RE: Screw compressors intermediate pressure estimation

(OP)
Thanks for the suggestion.

Those books are too expensive... and I only want the equation...

Using compressor manufacturer' software I drawn two diagram:
- suction pressure (x) vs intermediate (y)
- discharge pressure (x) vs intermediate (y)

and in both of them I found that intermediate pressure is linearly dependent on them...

I think that the equation could be

pi = a*p1 + b*p2 +c

The drawing shows that a>>b,
but I have no idea on their values,
and I have no interpretation of real mechanism...

Bye

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