Beckett Air Airflow Technology  
 
           
   

Engineering Services

Beckett Air's engineering and technical staff are ready to assist you in the areas of:

  • applications
  • product design
  • performance testing
  • failure analysis

Call us directly at: (440) 327-9999

or submit a request on our "Request Info" page

Performance Calculations

Performance curves for Beckett Air blower wheels were obtained through tests conducted following A.M.C.A. procedures utilizing a wind tunnel constructed to A.M.C.A. Std. 210, Figure 12, and A.S.H.R.A.E. Std. 51-75. Testing was performed with production Beckett Air blower wheels in Beckett Air housings using an open-inlet, open-outlet configuration. Data adjustments were made when necessary to reflect standard housing expansion angles.

The performance curves shown in this catalog are representative of the conditions stated above. Blower wheels are just one part of a complete system. Variations in inlet and outlet conditions, housing configuration, motor speed, and other factors may affect blower wheel performance. The designer should consider the entire system when making evaluations, and definitive analysis should be made utilizing a prototype system closely approximating the desired configuration.

Product
Specifications:

Single Fergas

Double Fergas

Single Strip

Double Strip

Backward Inclined

Mixed Flow

Blower Housings

Inlet Rings

Crossflow Wheels


Fan Laws

These laws govern the performance specifications of Beckett Air blower wheels:

When these conditions are fixed

and this is the variable

The laws are

The equations are

Impeller Speed (n) 1. Flow rate varies directly as the speed ratio. Q2 = Q1 n2/n1
System 2. Pressure varies as the square of the speed ratio. p2 = p1 (n2/n1)2
Density 3. Horsepower varies as the cube of the speed ratio HP2 = HP1 (n2/n1)2
Speed Impeller Diameter (D) 4. Flow rate varies as the cube of the fan diameter ratio. Q2 = Q1 (D2/D1)3
Density 5. Pressure varies as the square of the fan diameter ratio. p2 = p1 (D2/D1)2
Point of Rating 6. Horsepower varies as the 5th power of the fan diameter ratio. HP2 = HP1 (D2/D1)5
Flow Rate Density (p) 7. Horsepower and pressure vary directly as the air density ratio. p2 = p1 (p2/p1)
Speed HP2 = HP1 (p2/p1)

Legend

n = Fan speed in revolutions per minute

HP = Horsepower
Q = Flow rate in cubic feet per minute D = Fan Diameter in inches
p = Pressure in inches of water column p = Air density in lbs./cubic foot
(standard p, = .075 lbs./cu. ft.)
Subscript (1) denotes values read from tables in this catalog
Subscript (2) denotes values computed to the desired conditions
 
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