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9.3
Correction factors
Correction factor for operating pressure modifications:
Air inlet pressure
bar(g)
Factor (F1)
Correction factor for ambient temperature modifications (air-cooling):
Ambient temperature
Factor (F2)
Correction factor for air inlet temperature modifications:
Air temperature
Factor (F3)
Correction factor for dew point modifications:
Pressure dew point
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 RA 3600 eco has a planned nominal capacity of 3600 m³/h. The highest achievable air mass under the
following operating conditions is:
−
Air inlet pressure = 8 bar(g)
−
Ambient temperature = 30°C
−
Air inlet temperature = 40°C
−
Pressure dew point = 5°C
Every function parameter corresponds to a numerical factor which, multiplied by the planned nominal capacity,
determines the following:
Actual air throughput = 3600 x 1.05 x 0.95 x 0.81 x 1.09 = 3170 m³/h
3170 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 = 3000 m
−
Air inlet pressure = 8 bar(g)
−
Ambient temperature = 30°C
−
Air inlet temperature = 40°C
−
Pressure dew point = 5°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 3600 eco (with a specif. nominal capacity of 3,600 m³/h).
DRYPOINT® RA 5400-10800 eco
4
5
0.77
0.86
ºC
25
1.00
ºC
25
30
1.26
1.20
ºC
3
1.00
Factor (F1) = 1.05
Factor (F2) = 0.95
Factor (F3) = 0.81
Factor (F4) = 1.09
Required air throughput
factor (F1) x factor (F2) x factor (F3) x factor (F4)
3
/h
Factor (F1) = 1.05
Factor (F2) = 0.95
Factor (F3) = 0.81
Factor (F4) = 1.09
3000
1.05 x 0.95 x 0.81 x 1.09
6
7
8
0.93
1.00
1.05
30
35
0.95
0.93
35
40
45
1.00
0.81
0.68
5
1.09
= 3406 m³/h
Installation
10
12
1.14
1.21
40
45
0.85
0.73
50
55
0.57
0.46
7
10
1.19
1.37
14
1.27
60
0.38
31
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