Help with duct flow rate testing
Help with duct flow rate testing
(OP)
I haven't done this kind of testing before and would like to verify that I'm on the right track.
There is a duct system with many branches and in order to properly balance the system need to do some testing. I'm using an S type pitot tube with an inclined manometer. The duct is round and am taking (10) samples vertically and (10) horizontally based on a traverse set up for equal concentric areas. The tube and manometer are set up to read velocity pressure. At each duct I'm taking one temperature reading.
Velocity (ft/min) is calculated at each reading using velocity=4005 * sqrt(velocity pressure). All readings are then used to calculate the average velocity. Flow is calculated from average velocity * cross sectional area (sq.ft.)of duct. Then adjusting for temperature by multiplying by (530 / (T deg F + 460)) to get scfm.
Is this correct?
Thanks in advance for your help.
There is a duct system with many branches and in order to properly balance the system need to do some testing. I'm using an S type pitot tube with an inclined manometer. The duct is round and am taking (10) samples vertically and (10) horizontally based on a traverse set up for equal concentric areas. The tube and manometer are set up to read velocity pressure. At each duct I'm taking one temperature reading.
Velocity (ft/min) is calculated at each reading using velocity=4005 * sqrt(velocity pressure). All readings are then used to calculate the average velocity. Flow is calculated from average velocity * cross sectional area (sq.ft.)of duct. Then adjusting for temperature by multiplying by (530 / (T deg F + 460)) to get scfm.
Is this correct?
Thanks in advance for your help.





RE: Help with duct flow rate testing
This is also assuming dry air.
Thanks.