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Velocity use for cal. the duct transition pressure drop

Velocity use for cal. the duct transition pressure drop

Velocity use for cal. the duct transition pressure drop

Can someone help to advise me.

I try to calculate the pressure drop on duct transition lenght around 0.7m (Round(diameter 22") to rectangular (1.93mx1.93m) which the velocity air inlet at round side is 18.6 m/s. I got the formula dp(Pressure drop) = Co x (1/2) x density x velocity^2 . So I'm not sure what the correct velocity use on this formula. As i know the air velocity in the duct to be change as diffent duct cross section (as continuity equation)


RE: Velocity use for cal. the duct transition pressure drop

Read General Principles Of Ventilation in "Industrial Ventilation" published by the ACGIH or read SMACNA volumes covering the same thing.

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