Metric Conversion -- Flow Rate

[STYMIEDPIPER]

Requesting help in identifying/converting N as shown in the following flow rate:

Nm3/h

I know basic conversion

1 m3/h = 0.5885 cfm

What is N ?

Thanks

 

[katmar]

This is well described by Milton Beychok at

http://www.air-dispersion.com/formulas.html#standard

Note that the definition of normal conditions used by Milton is 1 atm absolute, but the definition given by IUPAC is 1 bar absolute. Whether flows are given in Nm³/h or SCFM, the reference conditions should always be given. If they are not, insist that you source supply them.

Once you have understood what this is all about, there is a gas flow converter built into a free units converter that I wrote called Uconeer. See the address in my signature below.

Katmar Software
Engineering & Risk Analysis Software

http://katmarsoftware.com

 

[zekeman]

NM^3 is the volume, M^3 of the gas at 273.15 °K and 101.325 kPa or standard atmosphere and 0 deg C. To get the M^3 at other temp/pressure conditions , you use the gas laws, viz
M^3=NM^3(T2/T1)(P1/P2)
where T1,P1 are the reference 0deg,i atmos state and
T2,P2 is the state at which you want to measure the CFM

 

[STYMIEDPIPER]

Thanks Katmar
Great site air-dispersion.com

I will place in my favorite folder