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#1
04-19-2007, 11:40 AM
 Unregistered Guest Posts: n/a
meters per second to CFM

I need to convert an air flow rate from meters per second to cubic feet per minute. I have looke on numerous sites to no avail, would love to have some help on this one.

Thanks
JR
#2
04-19-2007, 05:17 PM
 Robert Fogt Administrator Join Date: Dec 2005 Location: Seattle, WA Posts: 3,467 Rep Power: 13
Re: meters per second to CFM

meters/second * cross-sectional area of pipe = cubic meters/second
cubic meters/second * 2118.88 = cubic feet/minute

So you just need to calculate the cross area of the pipe the air flows through, in square meters.
#3
05-31-2010, 02:12 AM
 Unregistered Guest Posts: n/a
Re: meters per second to CFM

[QUOTE=Unregistered;19315]I need to convert an air flow rate from meters per second to cubic feet per minute. we cross area of 14'' X 15'' in squre. I have looke on numerous sites to no avail, would love to have some help on this one.

Thanks
M.Murtaza
#4
05-31-2010, 10:40 AM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,534 Rep Power: 19
Re: meters per second to CFM

[QUOTE=Unregistered;71048]
Quote:
 Originally Posted by Unregistered I need to convert an air flow rate from meters per second to cubic feet per minute. we cross area of 14'' X 15'' in squre. I have looke on numerous sites to no avail, would love to have some help on this one. Thanks M.Murtaza
1 m/s x 1 ft/0.3048 m x 60 s/1 min = 197 ft/min

14 " x 15" x 1 ft²/144 in² = 1.46 ft²

1.46 ft² x 197 ft/min = 288 ft³/min
#5
05-31-2010, 09:21 PM
 mohammad murtaza Junior Member Join Date: May 2010 Posts: 2 Rep Power: 0
Re: meters per second to CFM

I need to convert an air flow rate from meters per second to cubic feet per minute. we have outlet area of 12'' X 14'' in squre and other 10''x9'' in squre. I have looke on numerous sites to no avail, would love to have some help on this one.

Thanks
#6
06-01-2010, 01:34 AM
 mohammad murtaza Junior Member Join Date: May 2010 Posts: 2 Rep Power: 0
Re: meters per second to CFM

I need to convert an air flow rate from meters per second to cubic feet per minute. we have air flow 16 m/s at outlet area of 12'' X 14'' in squre and other Air flow 18 m/s at out let area of 10''x9'' in squre. I have looke on numerous sites to no avail, would love to have some help on this one.

Thanks
#7
06-01-2010, 02:34 AM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,534 Rep Power: 19
Re: meters per second to CFM

Quote:
 Originally Posted by mohammad murtaza I need to convert an air flow rate from meters per second to cubic feet per minute. we have air flow 16 m/s at outlet area of 12'' X 14'' in squre and other Air flow 18 m/s at out let area of 10''x9'' in squre. I have looke on numerous sites to no avail, would love to have some help on this one. Thanks Mohammad Murtaza
Just follow the example in post #4, using your numbers. Convert the velocity to ft/min. Determine the duct area in ft². Multiply. Done.
#8
12-30-2011, 10:54 AM
 Unregistered Guest Posts: n/a
Re: meters per second to CFM

Quote:
 Originally Posted by Robert Fogt meters/second * cross-sectional area of pipe = cubic meters/second cubic meters/second * 2118.88 = cubic feet/minute So you just need to calculate the cross area of the pipe the air flows through, in square meters.
actually that formula is incorrect the correct formula for m/sec to cfm would be:

cfm = m/sec * cross-sectional area of pipe * 60 * 3.28 (60*3.28 = 196.8 for a short cut) 60 for the time time conversion and 3.28 to convert meters to feet. i have no idea where you came up with 2118.8
#9
12-30-2011, 12:47 PM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,534 Rep Power: 19
Re: meters per second to CFM

Quote:
 Originally Posted by Unregistered actually that formula is incorrect the correct formula for m/sec to cfm would be: cfm = m/sec * cross-sectional area of pipe * 60 * 3.28 (60*3.28 = 196.8 for a short cut) 60 for the time time conversion and 3.28 to convert meters to feet. i have no idea where you came up with 2118.8
Please read the formula more carefully. It assumes you have flow in cubic meters per second. You must multiply by (1 ft/0.3048 m)³ x 60 s/min.
With reasonable rounding, that is 2118.88 (to nine significant figures).

If the cross sectional area of the pipe is in square meters you have cubic meters. If it is in feet or inches, you have a mixed unit mess. It is critical to keep all the units attached and work out the units math symbolically.
#10
02-10-2012, 08:51 PM
 santosh Guest Posts: n/a
Re: 0.8 meters per second to CFM

0.8 meters per second to CFM

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