Mammoth 800 to 5500 CFM: Dedicated Outdoor Air System with Enthalpy Wheels (VHC) - Manual (Page 47)

MAMM-VHC-IOM-1A (JANUARY 2013) 47
Appendix L: Enthalpy Wheel Pressure Drop vs. Flow Formulae and
Curves
Enthalpy Wheel Pressure Drop vs. Flow
Formula
Flow in cfm = pressure drop measured in ” w.c. / pressure
drop coefficient based on enthalpy wheel size
Enthalpy Wheel Pressure Drop vs. cfm
Curves (based on wheel diameter x depth
(inches))
Table L1: Enthalpy Wheel Pressure Drop Coefficient
Enthalpy Wheel Size
(diameter x depth in inches)
Pressure Drop
Coefficient
36 x 4 0.00029551
36 x 6 0.00032675
36 x 8 0.00038283
42 x 4 0.00021504
42 x 6 0.00023397
42 x 8 0.00027220
50 x 4 0.00014783
50 x 6 0.00016034
50 x 8 0.00018639
0.5
0.6
0.7
0.8
0.9
1.0
0.4
0.3
0.1
0.2
0.0
0 500 1,000 1,500 2,000 2,500 3,000
Airflow [cfm]
Pr
essur
e Dr
op [in. w
.g.]
36” x 8” (High)
36”x 6” (Standard)
36” x 4” (Medium)
Figure L1: Pressure drop – 36” enthalpy wheel diameter
0.5
0.6
0.7
0.8
0.9
1.0
0.4
0.3
0.1
0.2
0.0
0 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000
Airflow [cfm]
Pr
essur
e Dr
op [in. w
.g.]
42” x 8” (High)
42”x 6” (Standard)
42” x 4” (Medium)
Figure L2: Pressure drop – 42” enthalpy wheel diameter
0.5
0.6
0.7
0.8
0.9
1.1
1.0
0.4
0.3
0.1
0.2
0.0
0 1,000 2,000 3,000 5,000 6,000 4,000
Airflow [cfm]
Pr
essur
e Dr
op [in. w
.g.]
50” x 8” (High)
50”x 6” (Standard)
50” x 4” (Medium)
Figure L3: Pressure drop – 50” enthalpy wheel diameter