PNEUMATIG.EU - GDYNIA UL.WIELKOPOLSKA 158 -
58 622 49 22
Installation
14
DRYPOINT® RA 3-160
9.3
Correction factors
Correction factor for operating pressure modifications:
Air inlet pressure bar(g)
4
5
6
7
8
10
12
14
15
16
Factor (F1)
0,77
0,86
0,93
1,00
1,05
1,14
1,21
1,27
1,30
1,30
Correction factor for ambient temperature modifications (air-cooled):
Ambient temperature
ºC
25
30
35
40
45
50
Factor (F2)
1,00
0,99
0,97
0,93
0,88
0,81
Correction factor for inlet air temperature modifications:
Air temperature
ºC
25
30
35
40
45
50
55
60
65
70
Factor (F3)
1,27
1,12
1,00
0,88
0,78
0,70
0,62
0,55
0,49
0,43
Correction factor for dew point modifications:
Dew point
ºC
3
5
7
10
Factor (F4)
1,00
1,09
1,19
1,37
Calculation of the air throughput:
Air throughput = nominal capacity x factor (F1) x factor (F2) x factor (F3) x factor (F4)
Example:
The
RA 40
has a nominal capacity of
240 m³/h
. Which is the max. permissible flow through the dryer under
the following operating conditions?
Air inlet pressure = 8 bar(g)
Ambient temperature = 45°C
Air inlet temperature = 50°C
Pressure dew point = 10°C
Factor (F1) = 1.05
Factor (F2) = 0.88
Factor (F3) = 0.70
Factor (F4) = 1.37
Every data element has a corresponding numerical factor, which, multiplied with the nominal capacity, is as follows:
Air throughput = 240 x 1.05 x 0.88 x 0.70 x 1.37 = 212 m³/h
212 m³/h
This is the maximum throughput rate for a dryer under these operating conditions.
Selection of a suitable dryer for a given task:
required nominal capacity
Min. air throughput =
factor (F1) x factor (F2) x factor (F3) x factor (F4)
Example:
With the following operating parameters:
Required nominal capacity = 180 m
3
/h
Air inlet pressure = 8 bar(g)
Ambient temperature = 45°C
Air inlet temperature = 50°C
Pressure dew point = 10°C
Factor (F1) = 1.05
Factor (F2) = 0.88
Factor (F3) = 0.70
Factor (F4) = 1.37
For the selection of the suitable dryer type, the required air flow must be divided by the correction factors of the pa-
rameters indicated above:
180
Min. air throughput =
1.05 x 0.88 x 0.70 x 1.37
= 203 m³/h
The suitable model is, therefore,
DRYPOINT RA 40
(240 m³/h – nominal capacity).
PNEUMATIG
