Beko DRYPOINT RA 1000/AC NA, Руководство по эксплуатации

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Installation
10 DRYPOINT RA 200 – 2500 NA
2.5. Correction factors
Correction factor for operating pressure changes :
Inlet air pressure
psig 60 80 100 120 140 160 180 200
barg 4 5.5 7 8 10 11 12.5 14
Factor (F1) 0.79 0.91 1.00 1.07 1.13 1.18 1.23 1.27
Correction factor for ambient temperature changes (Air-Cooled):
Ambient temperature
ºF 80 90 100 105 110 115 120
ºC 27 32 38 40 43 45 50
Factor (F2) 1.22 1.11 1.00 0.94 0.89 0.83 0.78
Correction factor for inlet air temperature changes:
Air temperature
ºF 90 100 110 120 130 140 150 160
ºC 32 38 43 50 55 60 65 70
Factor (F3) 1.16 1.00 0.85 0.73 0.63 0.54 0.47 0.40
Correction factor for DewPoint changes:
DewPoint
ºF 38 41 45 50
ºC 3 5 7 10
Factor (F4) 1.00 1.09 1.22 1.36
How to find the air flow capacity: How to select a suitable dryer for a given duty:
Air flow
capacity
=
X
Factor
(F1)
Factor
(F2)
X
Factor
(F3)
X X
Factor
(F4)
Nominal
duty
= ÷
Factor
(F1)
Factor
(F2)
÷
Factor
(F3)
÷ ÷
Factor
(F4)
Design
air flow
Std. air
flow rate
Minimum
Example: Example:
An DRYPOINT RA 500 NA has a nominal duty of 500
scfm (849 m3/h). What is the maximum allowable flow
through the dryer under the following operating
conditions:
–
Inlet air pressure = 120 psig (8 barg)
–
Ambient temperature = 105°F (40°C)
–
Inlet air temperature = 105°F (40°C)
– Pressure DewPoint = 38°F (3°C)
Each item of data has a corresponding numerical factor
as follows:
The procedure here is to list the operating conditions and
then to locate the corresponding numerical factors:
–
Design air flow = 300 scf m (509 m
3
/h)
–
Inlet air pressure = 120 psig (8 barg)
– Ambient temperature = 105°F (40°C)
– Inlet air temperature = 105°F (40°C)
– Pressure DewPoint = 38°F (3°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:
=
348 scfm (591 m
3
/h) → This is the
maximum flow rate that the dryer can accept under
these operating conditions.
=
432 scfm (734 m
3
/h) → Therefore the model
suitable for the conditions above is DRYPOINT RA 500
NA (500 scfm or 849 m3/h - nominal duty).
= x
x
x x
1.07 500 0.89 1.00 0.85
capacity
Air flow
= ÷
÷ ÷
÷
1.07 300 0.89 1.00 0.85
flow rate
Minimum