×
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

sheave sizing

sheave sizing

sheave sizing

(OP)
I have some fans at work whose drives were down sized back in the 1980`s I assume for energy savings.I have original engineered specs for the systems which gives me the:
motor hp,fan rpm,cfm,static pressure( though I don`t know where it was measured),and the original driven sheave diameter.How do I calculate the motor sheave diameter and horse power or break hose power required? Thanks,tombro

RE: sheave sizing

Motor rpm x motor sheave diameter = fan rpm x fan sheave diameter.

Motor sheave diameter = fan sheave diameter x fan rpm/motor rpm

Ted

RE: sheave sizing

Many fan drives for AC systems use variable pitch pullies to get the ratio range close to spec. The pitch is usually opened up or closed to achieve the proper CFM. When the proper pitch is found the pulley is locked down, and usually not changed for it's lifetime. It is much cheaper and efficient to use fixed pitch pullies, as the vari-pitch pullies are much more expensive and heavier.

 

Russell Giuliano
 

RE: sheave sizing

To add to the above.

Power=Energy/time=Torque*angular velocity

TTFN,

Fe

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