Previous in Forum: equipment maintenance   Next in Forum: Steam Turbines - Shaft Manufacturing Process
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
5 comments
Rate Comments: Nested
Anonymous Poster

CFM and dBA for fans

11/02/2009 12:30 PM

My question(s) are regarding CFM and dBA (noise). How is CFM calculated, if you have (2) fan(s) mounted in a box that have a CFM of 50 / ea would the total CFM be considered 100 CFM (would it matter if they are configured as intake and exhaust)?

Now the dBA (noise), if each fan is rated at 60 dBA would the total be considered the rating multiplied by the number of fans (that would be really high)?
Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
lyn
Guru

Join Date: Oct 2008
Posts: 42355
Good Answers: 1693
#1

Re: CFM and dBA for fans

11/02/2009 1:07 PM

You don't say if the fans are mounted in series or parallel. There are CFM calculators on the net.

Noise measurement is less straight forward.

Perhaps more details? Is this theoretical or practical?
Reply
Anonymous Poster
#2
In reply to #1

Re: CFM and dBA for fans

11/02/2009 1:25 PM

This is a practical application. The Fans would be mounted in series.
Reply
lyn
Guru

Join Date: Oct 2008
Posts: 42355
Good Answers: 1693
#3
In reply to #2

Re: CFM and dBA for fans

11/02/2009 3:10 PM

Virtual Airflow Calculator

See if this helps.

You can worry about the noise later. It's much more complex. So complex that actual measurement will be the only way to get a number.
Reply
Anonymous Poster
#4
In reply to #3

Re: CFM and dBA for fans

11/02/2009 4:42 PM

I'll give it a shot...

Thanks
Reply
lyn
Guru

Join Date: Oct 2008
Posts: 42355
Good Answers: 1693
#5
In reply to #4

Re: CFM and dBA for fans

11/02/2009 4:50 PM

I believe that you will find that air is more efficiently pushed, than pulled, in a quasi-open system.
Reply
Reply to Forum Thread
Have a Different Question?
5 comments

Previous in Forum: equipment maintenance   Next in Forum: Steam Turbines - Shaft Manufacturing Process

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Manufacturing:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General Discussion
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (145 right now)
Show Members
Advertisement