×
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

Advice on designing a closed loop system

Advice on designing a closed loop system

Advice on designing a closed loop system

(OP)
We will be designing a closed loop air circulation system employing a blower.  Water is being injected at one point in the system.  I have calculated P droops & blower sizing for open systems before.  Would it be true that the procedure is the same (Blower needs to make up for P drop though conduit & fittings from outlet to intake?)  Is there anything I mauy be missing here?

RE: Advice on designing a closed loop system

Its the same, assuming its not much water.

Don't know.  What did you leave out of the question?

 

**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/

RE: Advice on designing a closed loop system

(OP)
Well, here's two questions that come to mind.

1. Is it reasonable to assume that the lowest and highest pressure points in the system are the intake & outlet of the blower?

2. How can I force any point in the loop to be at atmospheric pressure?

RE: Advice on designing a closed loop system

1. Not necessarily.  In a loop with elevation changes the lowest pressure is at the top when the system is static only, after that, if frictional drop in the piping/ducting thereafter exceeds static pressure, the lowest pressure will be at the inlet to the machine, otherwise it could be anywhere between the highest point in the system and the machine's inlet.  That depends a lot on what the specific gravity is of your fluid.  Since you're talking about blowers, its probably not too significant.  So we'll say, it will be at the inlet to the blower.

2.  drill a hole in it.

**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/

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