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8.3
Correction factors
Correction factor for operating pressure modifications:
Inlet air pressure
Factor (F1)
Correction factor for ambient temperature modifications (Air-Cooled):
Ambient temperature
Factor (F2)
Correction factor for inlet air temperature modifications:
Air temperature
Factor (F3)
Correction factor for DewPoint modifications:
DewPoint
Factor (F4)
Calculation of the actual air throughput:
Actual air throughput = air throughput acc. to planning x factor (F1) x factor (F2) x factor (F3) x factor (F4)
Example:
The DRYPOINT RA VSD 800 has a planned nominal capacity of 800 scfm (1358 m³/h). The highest
achievable air mass under the following operating conditions is:
Air inlet pressure = 120 psig (8 barg)
Ambient temperature = 115°F (45°C)
Air inlet temperature = 122°F (50°C)
Pressure dew point = 50°F (10°C)
Every function parameter corresponds to a numerical factor which, multiplied by the planned nominal capacity, determines the
following:
Actual air throughput = 800 x 1.07 x 0.78 x 0.68 x 1.36 = 617 scfm (1048 m³/h)
617 scfm (1048 m³/h) is the maximum air mass of the dryer under the aforementioned operating conditions.
Selection of the best suitable model in accordance with the operating conditions:
Air throughput acc. to planning =
Example:
The following operating parameters are known:
Required air mass = 750 scfm (1274 m
Air inlet pressure = 120 psig (8 barg)
Ambient temperature = 115°F (45°C)
Air inlet temperature = 122°F (50°C)
Pressure dew point = 50°F (10°C)
To find out the correct dryer version, the required air mass must be divided by the correction factors of the parameters
indicated above:
Air throughput acc. to planning=
The suitable model for these requirements is DRYPOINT RA VSD 1000 (with a specif. nominal capacity of 1000 scfm [1698
m³/h]).
DRYPOINT® RA VSD 800-2500
psig
60
80
barg
4
5.5
0.79
0.91
ºF
80
90
ºC
27
32
1.11
1.09
ºF
90
100
ºC
32
38
1.16
1.00
ºF
38
ºC
3
1.00
Factor (F1) = 1.07
Factor (F2) = 0.78
Factor (F3) = 0.68
Factor (F4) = 1.36
Required air throughput
factor (F1) x factor (F2) x factor (F3) x factor (F4)
3
/h)
Factor (F1) = 1.07
Factor (F2) = 0.78
Factor (F3) = 0.68
Factor (F4) = 1.36
750
1.07 x 0.78 x 0.68 x 1.36
100
120
140
7
8
10
1.00
1.07
1.13
95
100
35
38
1.06
1.00
110
122
130
43
50
55
0.82
0.68
0.61
41
5
1.08
= 972 scfm (1652 m³/h)
Installation
160
180
11
12
1.18
1.23
105
110
40
43
0.94
0.87
140
150
60
65
0.52
0.45
45
50
7
10
1.20
1.36
203
14
1.27
115
45
0.78
158
70
0.40
15
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Troubleshooting
