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Correction factor for operating pressure changes :
Inlet air pressure
Factor
Correction factor for ambient temperature changes (Air-Cooled):
Ambient temperature
Factor
Correction factor for inlet air temperature changes:
Air temperature
Factor
Correction factor for DewPoint changes:
DewPoint
Factor
How to find the air flow capacity:
Air flow
Nominal
Factor
=
X
capacity
duty
(F1)
Example:
A TDRY 49 dryer has a nominal duty of
4900 Nl/min. What is the maximum allowable
flow through the dryer under the following
operating conditions:
−
Inlet air pressure = 8 barg
−
Ambient temperature = 45°C
−
Inlet air temperature = 50°C
−
Pressure DewPoint = 10°C
Each item of data has a corresponding numerical
factor which multiplied by the design air flow is as
follows:
4900
1.06
Air flow
=
x
capacity
= 3498 Nl/min → This is the maximum
flow rate that the dryer can accept under these
operating conditions.
2.5 CORRECTION FACTORS
barg
4
0.77
ºC
25
1.00
ºC
30
1.20
ºC
3
1.00
Factor
Factor
Factor
X
X
X
(F2)
(F3)
(F4)
0.80
0.61
1.38
x
x
x
5
7
0.85
1.00
1.06
30
0.98
0.95
35
40
1.00
0.85
5
1.09
How to select a suitable dryer for a given duty:
Minimum
Design
=
Std. air
air flow
flow rate
Example:
W ith the following operating parameters:
−
Design air flow = 2800 Nl/min
−
Inlet air pressure = 8 barg
−
Ambient temperature = 45°C
−
Inlet air temperature = 50°C
−
Pressure DewPoint = 10°C
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
2800
=
flow rate
= 3920 Nl/min → Therefore the model
suitable for the conditions above is TDRY 49 (4900
Nl/min - nominal duty).
8
10
12
1.15
1.21
35
40
0.90
45
50
0.75
0.61
7
1.18
Factor
Factor
Factor
÷
÷
÷
(F1)
(F2)
1.06
0.80
0.61
÷
÷
÷
GB
14
1.25
45
0.80
55
0.49
10
1.38
Factor
÷
(F3)
(F4)
1.38
÷
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