Sizing - Champion CRN Series Instruction Manual

SIZING

Determining dryer capacity at actual operating conditions
To determine the maximum inlet flow capacity of a dryer
at various operating conditions, multiply the rated capacity
from Table 1 by the multipliers shown in Table 2.
Example: How many scfm can an air-cooled 750 scfm
model handle when compressed air to be dried is at 200
psig and 100°F; ambient air temperature is 80°F; and a
38°F dew point temperature is desired?
Answer: 750 x 1.22 x 1.12 x 1.0 = 1,025 scfm.
TABLE 1
Rated capacity (scfm) and pressure drop @ 100 psig inlet
pressure, 100°F inlet temperature, and 100°F ambient
temperature
MODELS 125 150
Rated capacity 60 Hz 125 150
of air-cooled 50 Hz 104 125
models (scfm)
10
200 250 300 400 500
200 250 300 400 500
167 208 250 333 417
TABLE 2
Air capacity correction factors (Multipliers)
INLET
PRESSURES 80°F
psig kgf/cm 2 27°C
50 3.5 1.35
80 5.6 1.50
100 7.0 1.55
125 8.8 1.63
150 10.5 1.70
175 12.3 1.75
200 14.0 1.80
COOLING MEDIUM*
AMBIENT
750
TEMPERATURE MULTIPLIER
750 °F °C
625
80 27
90 32
100 38
110 43
*Air-cooled models; water-cooled models use 1.15 multiplier if cooling
water is below 35°C, 95°F.
INLET COMPRESSED AIR CONDITIONS
INLET TEMPERATURES
90°F 100°F
32°C 38°C
1.05 0.84
1.17 0.95
1.23 1.00
1.31 1.07
1.37 1.13
1.42 1.18
1.47 1.22
OUTLET DEWPOINT
DEWPOINT
TEMPERATURE
°F °C
1.12 38 3
1.06 45 7
1.00
50 10
0.94
110°F
43°C
0.69
0.79
0.82
0.91
0.95
0.99
1.03
MULTIPLIER
1.0
1.2
1.3