Question
What is the diameter of a round duct if the flow rate is 1000 CFM and the velocity pressure is 2.25 inches of water gauge?
What is the diameter of a round duct if the flow rate is 1000 CFM and the velocity pressure is 2.25 inches of water gauge?
Compute velocity pressure using the formula:
V= 4005 x VP, where
V= velocity, feet per minute (fpm)
VP = velocity pressure, inch in water gauge
Compute cross sectional area of a circular duct using formula:
AREA = r2; where:r = the radius of the duct; 2r = d; d = diameter
Compute volumetric Flow Rate using the formula:
Q = VA, where
Q = flow rate (ft3/ min or M3/min)
V = Velocity (ft/min or m/min)
A = cross sectional area (ft2 or m2)
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