PDA

View Full Version : Convert airflow in fpm or m/sec to kg/hr or vice versa

Unregistered
01-17-2006, 09:28 PM
HI,

Convert airflow in fpm or m/sec to kg/hr or vice versa.

Regards
Manoj
Degree Controls, Inc

Robert Fogt
01-17-2006, 10:48 PM
feet/minute and meter/second are units of speed and first need to be converted to units of flow rate.

For example, I assume the air is traveling through a pipe at a certain speed, so we would need to determine the cross-sectional area of the pipe, then we could convert the meters/second to cubic meters/second.

After that it is just a matter of looking up the density to convert a volume flow rate to a mass flow rate.

chinaman
01-22-2006, 11:42 PM
you cannot convert fpm or m/sec to kg/hr! no relationship between feet or meter to kg.

fpm or m/sec are units for speed while kg/hr, kg/min and kg/sec are unit for mass flow rate.
m(meter), f(feet) these are units for distance. change of distance with respect to time is speed. Kg(kilogram), lb(pounds) these are units for mass or the heaviness of an object. change of mass with respect to time is mass a flow rate.

Unregistered
02-24-2010, 05:54 AM
Mass Airflow (kg/sec) = Air Density (kg/m3) x Volume Airflow (m3/sec)
Also:-
Air velocity (m/sec) = Mass Air Flow (kg/sec) x [1/ {Air Density (kg/m3)}] x [1/ {Cross Section Area (m2)}]