Danfoss VLT Flow Drive FC 111 Design Manual page 17

VLT® Flow Drive FC 111
Design Guide
3.1.1.4 Example with Varying Flow over 1 Year
This example is calculated based on pump characteristics obtained from a pump datasheet. The result obtained shows energy sav-
ings of more than 50% at the given flow distribution over a year. The payback period depends on the price per kWh and the price of
drive. In this example, it is less than a year when compared with valves and constant speed.
Energy savings
P = P
shaft shaft output
[h] t
2000
1500
1000
500
100 200
Illustration 6: Flow Distribution over 1 Year
H
(m w g)
s
60
50
B
40
30
20
C
10
750r pm
0 100
P
(kW )
shaf t
60
50
40
30
B 1
20
10
C 1
750r pm
0 100
Illustration 7: Energy
Table 5: Result
3
m /h Distribution
% Hours
Danfoss A/S © 2021.04
300 400
3
[m
A
1650r pm
1350r pm
1050r pm
(
200 300 400
A 1
1650r pm
1350r pm
1050r pm
(
200 300 400
Valve regulation
Power
A - B
1 1
Q
/h]
3 )
m /h
)
3
m /h
Consumption
kWh
Product Overview
Drive control
Power Consumption
A - C kWh
1 1
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