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9. Commissioning
Flow rate calculation
The flow rate is calculated using the effective pressure method. This involves
comparing the static pressure upstream of the inlet nozzle with the static
pressure in the inlet nozzle.
The flow rate can be calculated from effective pressure Δp
w
(differential pressure of the two static pressures) using the following equation.
The doors must be closed to determine the correct flow rate. Route the test
hoses to the outside when conducting the test.
Due to the installation conditions of the fans, K values differing from the
manufacturer's specifications must be used for flow rate determination.
CFL 10 effective pressure
Δp = effective pressure
(symbolic representation)
CFL 15 effective pressure
Δp = effective pressure
(symbolic representation)
Δp
[Pa] 50
75 100 130 165 205
245
295
345
400 460
V
[m³/h] 500 600 700 800 900 1000 1100 1200 1300 1400 1500
For the CFL 15 use a K value of 70.
Ef
fective pressure
Δp [Pa]
Flow rate [m³/h]
Δp
[Pa]
3
10
20
40
60
85
115
150
190
235
V
[m³/h] 100
200
300
400
500
600
700
800
900 1000
For the CFL 10 use a K value of 65.
Ef
fective pressure
Δp [Pa]
Flow rate [m³/h]
