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31 Cards in this Set
- Front
- Back
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volumetric flow rate, ducts and hood
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duct area and velocity, inverse relationship
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duct pressure relationships
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duct entry losses
HL equals loss in a duct as a fraction of VP |
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duct velocity and velocity pressure
V = FPM TP = inches water gauge pressure 4005 = (LBM/foot cubed) |
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hood static pressure
HE = hood entry loss (as a fraction of the VP) |
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resultant duct velocity pressure
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average duct velocity pressure
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coefficient of entry
Ce = hood entry coefficient |
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hood entry loss and hood entry loss factor
he = hood entry loss (inches water gauge pressure) Fh = good entry loss factor |
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hood entry loss
Ce = hood entry coefficient He = hood entry energy loss |
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Duct Velocity and Density
ro = 0.075 lbm/ft^3 @ 70 degrees |
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hood flow rate and static pressure
Ce = hood entry coefficient a = square feet Q = CFM SP = inches wide gauge pressure |
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hood flow rate and air density factor
a = square feet Q = CFM FH = hood entry loss factor DF = density factor (compared to STP) |
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hood flow rate and air density
a = squared row = density of air (pounds per cubic foot) FH = hood loss factor |
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Balancing Flow Rate at Junctions
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Dilution Ventilation: Steady State with Generation Rate
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Dilution Ventilation: Concentration Buildup
G = CFM Q '= CFM C = PPM/10^6 t = min |
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Dilution Ventilation: Time Interval for Purging
V = ft^3 t = min C = ppm |
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effective ventilation rate
KE = safety factor (1 – 10) |
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Room Air Changes per Hour
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Dilution Ventilation: Concentration Buildup, No Initial Concentration
G = CFM Q = CFM N = AC/H C = PPM |
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Dilution Ventilation: Concentration After Purging
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Dilution Ventilation: Steady State with Specific Gravity
ER = pints/minute!!! C/TLV = ppm |
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a
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Fan Law: Power and RPM
ro = density of air (lbm/ft^3) |
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Fan Law: Static Pressure and RPM
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Fan Law: flow and RPM
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Fan Static Pressure
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fan total pressure
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Q=G/C
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Basic Dilution Ventilation Rate
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