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Installation
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 RS 100 HP50 NA has a planned nominal capacity of 100 scfm (170 m³/h). The highest achievable air
mass under the following operating conditions is:
−
Air inlet pressure = 550 psig (38 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 = 100 x 0.98 x 0.78 x 0.68 x 1.36 = 71 scfm (121 m³/h)
71 scfm is the maximum flow rate 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 = 100 scfm (170 m
−
Air inlet pressure = 550 psig (38 barg)
−
Ambient temperature = 115°F (45°C)
−
Air inlet temperature = 110°F (43°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 RS 140 HP50 NA (with a spec. nominal capacity of 140 scfm
(238 m³/h).
14
psig
200
300
barg
14
21
0.53
0.71
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) x Factor (F2) x Factor (F3) x Factor (F4)
3
/h)
100
0.98 x 0.78 x 0.82 x 1.36
400
500
550
28
34
38
0.84
0.94
0.98
95
100
105
35
38
40
1.06
1.00
0.94
110
122
43
50
0.82
0.68
41
5
1.08
Factor (F1) = 0.98
Factor (F2) = 0.78
Factor (F3) = 0.68
Factor (F4) = 1.36
Requ. air throughput
Factor (F1) = 0.98
Factor (F2) = 0.78
Factor (F3) = 0.82
Factor (F4) = 1.36
= 117 scfm (199 m³/h)
DRYPOINT® RS 15-550 HP50 NA
580
650
40
45
1.00
1.05
110
115
43
45
0.87
0.78
130
140
55
60
0.61
0.52
45
50
7
10
1.20
1.36
725
50
1.10
122
50
0.69
150
65
0.45
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