Velocity of Reuturn AIR Duct
Velocity of Reuturn AIR Duct
(OP)
What Should be the standard return air velocity for an AHU of 29,000 cfm
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Velocity of Reuturn AIR Duct
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RE: Velocity of Reuturn AIR Duct
Duct velocity has many variables, a couple, just to start
Noise
Carrying material?
RE: Velocity of Reuturn AIR Duct
or
medium pressure
system?
knowledge is power
RE: Velocity of Reuturn AIR Duct
RE: Velocity of Reuturn AIR Duct
http://www.engineeringtoolbox.com/duct-velocity-d_...
but your still need engineering judgement on prevalent criteria, velocity is only one possible criteria for duct sizing, than place of application, and you finally need to separately consider main duct, symmetrical or asymmetrical branches, runouts, and finally you need to perform enough calculations to make sure that network balancing will be possible at all.
i am saying all this to give you idea that sizing ducting based on mere velocity, especially based on one figure is totally wrong, it can be only initial step in iterative calculation.
though, i must admit such an approach gives me more job sometimes
did you ever visit exclusive restaurant where there is apparent large stain around number of celiing diffusers close to one corner, to find out that corner is closest to ahu?
industrial environment has different problems, some people insisti on velocity method though static regain could save them costs.
RE: Velocity of Reuturn AIR Duct
If you try to bootstrap this, it will bite you in the butt.