Installation
DRYPOINT® RA HT 20-350 NA UL
13
8.3
Correction factors
Correction factor for operating pressure modifications:
Inlet air pressure
psig
60
80
100
120
140
160
180
200
220
230
barg
4
5.5
7
8
10
11
12.5
14
15
16
Factor (F1)
0.79
0.91
1.00
1.07
1.13
1.18
1.23
1.27
1.31
1.33
Correction factor for ambient temperature modifications:
Ambient temperature
ºF
80
90
100
105
110
115
120
ºC
27
32
38
40
43
46
50
Factor (F2)
1.22
1.11
1.00
0.94
0.89
0.83
0.78
Correction factor for inlet air temperature modifications:
Air temperature
ºF
140
160
170
180
195
210
ºC
60
70
76
82
90
100
Factor (F3)
1.26
1.13
1.07
1.00
0.90
0.81
Correction factor for DewPoint modifications:
DewPoint
ºF
37
41
45
50
ºC
3
5
7
10
Factor (F4)
0.78
0.90
1.00
1.12
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:
An
DRYPOINT RA HT 150
NA UL
has a nominal duty of
150 scfm (255 m
3
/h)
. The highest achievable air mass
under the following operating conditions is:
−
Air inlet pressure = 120 psig (8 barg)
−
Ambient temperature = 105°F (40°C)
−
Air inlet temperature = 195°F (90°C)
−
Pressure dew point = 45°F (7°C)
Factor (F1) = 1.07
Factor (F2) = 0.94
Factor (F3) = 0.90
Factor (F4) = 1.00
Every function parameter corresponds to a numerical factor which, multiplied by the planned nominal capacity,
determines the following:
Air flow capacity = 150 x 1.07 x 0.94 x 0.90 x 1.00 = 137 scfm. (233
m³/h)
137 scfm (233
m³/h) This is the maximum flow rate that the dryer can accept under these operating conditions.
How to select a suitable dryer for a given duty:
Minimum std. air flow rate =
Design air flow
Factor (F1) x Factor (F2) x Factor (F3) x Factor (F4)
Example:
The following operating parameters are known:
−
Required air mass = 95 scfm (161 m
3
/h)
−
Air inlet pressure = 120 psig (8 barg)
−
Ambient temperature = 105°F (40°C)
−
Air inlet temperature = 195°F (90°C)
−
Pressure dew point = 45°F (7°C)
Factor (F1) = 1.07
Factor (F2) = 0.94
Factor (F3) = 0.90
Factor (F4) = 1.00
In order to select the correct dryer model the required flow rate is to be divided by the correction factors relating to
above mentioned parameters:
Minimum std. air flow rate =
95
= 104 scfm (177 m³/h)
1.07 x 0.94 x 0.90 x 1.0
Therefore the model suitable for the conditions above is
DRYPOINT RA HT 150
NA UL
(
150 scfm
or
255 m
3
/h
-
nominal duty).
Summary of Contents for DRYPOINT RA HT 100-P NA UL
Page 19: ...DRYPOINT RA HT 20 350 NA UL 19 10 2 Technical data DRYPOINT RA HT 150 350 NA E 1 230 60 UL ...
Page 34: ...Appendices 34 DRYPOINT RA HT 20 350 NA UL 13 1 2 Dryers Dimensions DRYPOINT RA HT 75 NA UL ...
Page 35: ...Appendices DRYPOINT RA HT 20 350 NA UL 35 13 1 3 Dryer dimensions DRYPOINT RA HT 100 NA UL ...
Page 36: ...Appendices 36 DRYPOINT RA HT 20 350 NA UL 13 1 4 Dryer dimensions DRYPOINT RA HT 150 NA UL ...
Page 46: ...Appendices 46 DRYPOINT RA HT 20 350 NA UL 13 3 2 Electric diagram DRYPOINT RA HT 20 50 NA UL ...
Page 47: ...Appendices DRYPOINT RA HT 20 350 NA UL 47 13 3 3 Electric diagram DRYPOINT RA HT 75 100 NA UL ...
Page 48: ...Appendices 48 DRYPOINT RA HT 20 350 NA UL 13 3 4 Electric diagram DRYPOINT RA HT 150 NA UL ...
Page 51: ...Appendices ...
