Transcription of Airflow quick reference guide - Fluke Corporation
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Airflow quick reference guide - Fluke Corporation
Calculating Air Changes per HourACH = Q x 60 / Room Volume ft3 Q = ft3/minute (CFM)Calculating Air Velocity (Standard, 70 F @ in. Hg)V = 4005 x VPVP = (V/4005)2V = Velocity, fpmVP = Velocity pressure, in. wcCalculating Air Velocity with density correction (Actual)V = x VP/DV = Velocity, ft/minute (fpm)VP = Velocity pressure, in. wcD = Density, lbs/ft3, x (530/460+Tact) x (Pact / )Tact = measured dry bulb temperature of the actual airstream, FPact = absolute pressure of the actual airstream, in. HgCalculating Air Flow (Standard, 70 F @ in. Hg)Q = A x VQ = ft3/minute (CFM)A = duct area (ft2)V = Velocity, ft/minute (fpm)Calculating Air Flow with density correctionCorrecting for standard cfmSCFM = ACFM(530/(460+Tact))( )SCFM = standard flow rateACFM = actual flow rate= measured flow rateTact = measured dry bulb temperature of the actual airstream, FPact = absolute pressure of the actual airstream, in.
Calculating Air Changes per Hour ACH = Q x 60 / Room Volume ft3 Q = ft3/minute (CFM) Calculating Air Velocity (Standard, 70 °F @ 29.92 in. Hg) V = 4005 x √VP
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