×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• Best Of All, It's Free!

*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.

Compessed air volume and compressor efficiency.

Compessed air volume and compressor efficiency.

(OP)
I'm trying to get info together for our compressor set up. What I need is to get some idea of how compressed air volume and compressor efficiency are affected by inlet air temperature variations. The aim is to see if there is justification in supplying the compressor inlet externally from compressor room rather than internally.

If any one has some ideas or just rules of thumb it would be helpful.

RE: Compessed air volume and compressor efficiency.

Theoretically, the effiency of the compression cycle should not change due to inlet temperature.  What will change is the SCFM.  The ACFM will be constant, but the higher temperature will reduce the SCFM by (COLDTemp+460)/(HOTTemp +460).

Because the overall effiency in the compressor is also related to pressure losses in piping, valves, and passages, the effiency will drop with higher suction temperatures.  The exact amount is a function of mechanical design and not thermodynamics.  I ran a check on an Ariel compressor and saw a 5% increase in HP/MCSF when the suction temperature was raise from 100 F to 150 F.

RE: Compessed air volume and compressor efficiency.

dcasto

I think that it sould be SQRT((COLDTemp+460)/(HOTTemp +460).)

RE: Compessed air volume and compressor efficiency.

no, its directly proportional as in PV= znRT and
P1 / T1 = P2 / T2  Its adjusting the volume, not the flow rate.

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.

Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a partâ€™s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!