DK50 3x4VR/M
10/2018
NP-DK50-3x4VRM_ED-EN-2_10-2018
- 9-
6.1.
Freeairdelivery (FAD) correctiondue to elevation
FAD correction table
FAD reference conditions:
Elevation: 0 MASL
Temperature: 20°C
Atmospheric pressure: 101325 Pa
Relative humidity: 0%
6.2.
Dryerperformancecorrection
Reference values for the ED72 dryer
Air temperature at dryer inlet
t
inlet
°C
35 (max. 55)
Ambient temperature
t
0
°C
25 (max. 45)
Working pressure
p
bar
7 (max.16)
Pressure dew point
PDP
°C
+3 (-22 atm.)
ED72
dryer correction factors
Correction factor for working pressure
p (bar)
4
5
6
7
8
9
10
F
C1
0.78
0.85
0.93
1.0
1.06
1.11
1.15
Correction factor for temperature of compressed air entering the dryer
t
inlet
(°C)
30
35
40
45
50
55
F
C2
1.2
1.0
0.85
0.71
0.58
0.49
The cooler in use cools the compressed air to a temperature that is ~6
o
C higher than the ambient
temperature.
Therefore: t
inlet
= t
o
+ 6
o
C
E.g. for an ambient temperature of t
o
= 24
o
C, t
inlet
= 24
o
+ 6
o
= 30
o
C → F
C2
= 1.2
Dew point correction factor
PDP (°C)
3
4
5
6
7
8
9
F
C3
1
1.04
1.09
1.14
1.18
1.25
1.3
Correction factor for ambient temperature
t
o
(°C)
25
30
35
40
F
C4
1
0.96
0.92
0.88
Elevation [MASL]
0 - 1500 1501 - 2500
2501 -
3500
3501 -
4500
FAD [l/min]
FAD x 1
FAD x 0.8 FAD x 0.71 FAD x 0.60
