21
5.0 REFERENCE
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 model RNC750
handle when compressed air to be dried is at 200 psig and
100°F; ambient air temperature is 80°F?
Answer:
750 x 1.22 x 1.12 = 1,025 scfm.
TABLE 1
Rated capacity (scfm) and pressure drop @ 100 psig inlet
pressure, 100°F inlet temperature, and 100°F ambient
temperature
RNC MODEL
100
125
150
200
250
Rated capacity
of air-cooled
models (scfm)
60 Hz
50 Hz
100
84
125
105
150
125
200
170
250
210
RNC MODEL
300
400
500
600
750
Rated capacity
of air-cooled
models (scfm)
60 Hz
50 Hz
300
250
400
340
500
420
600
540
750
630
TABLE 2
Air capacity correction factors (Multipliers)
INLET COMPRESSED AIR CONDITIONS
INLET
PRESSURES
INLET TEMPERATURES
80°F
90°F
100°F
110°F
120°F
psig
kgf/cm
2
27°C
32°C
38°C
43°C
49°C
50
80
100
125
150
175
200
3.5
5.6
7.0
8.8
10.5
12.3
14.0
1.35
1.50
1.55
1.63
1.70
1.75
1.80
1.05
1.17
1.23
1.31
1.37
1.42
1.47
0.84
0.95
1.00
1.07
1.13
1.18
1.22
0.69
0.79
0.82
0.91
0.95
0.99
1.03
0.56
0.66
0.70
0.74
0.80
0.84
0.89
COOLING MEDIUM*
AMBIENT
TEMPERATURE
MULTIPLIER
°F
°C
80
90
100
110
27
32
38
43
1.12
1.06
1.00
0.94
*Air-cooled models; water-cooled models use 1.15 multiplier if cooling water
is below 35°C, 95°F.
