Danfoss VLT AQUA Drive FC 202, Руководство по конструкции, Страница: 22 / 218

e
3
0
b
d
8
8
9
.1
0
60
50
40
30
20
10
H
s
0 100 200 300 400
(mwg)
1350rpm
1650rpm
0
10
20
30
(kW)
40
50
60
200 100 300
(
m
3
/h
)
(
m
3
/h
)
400
1350rpm
1650rpm
P
shaft
1
Illustration 6: Example of Energy Savings
1 Energy saving
4.3.1 Example of Energy Savings
As shown in Illustration 7 , the flow is controlled by changing the speed of a centrifugal pump, measured in RPM. By reducing the
speed only 20% from the rated speed, the flow is also reduced by 20%. This is because the flow is directly proportional to the speed.
The consumption of electricity, however, is reduced by up to 50% due to the variable-torque profile of the pump.
If the system only supplies a flow that corresponds to 100% a few days in a year, while the average is below 80% of the rated flow for
the remainder of the year, more than 50% of energy is saved.
See the dependence of flow, pressure, and power consumption on pump speed in RPM for centrifugal pumps in
Illustration 7 .
AJ300847815559en-000101 / 130R0337 22 | Danfoss A/S © 2020.09
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