Danfoss VLT DriveMotor FCP 106, Руководство по конструкции, Страница: 53 / 82

for example to 60%. Energy savings of more than 50% can
be achieved by applying a VLT solution in typical
applications.
195NA444.10
100
80
60
40
20
0
0 60
0 60 0 60
%
%
1
2
3
1 Discharge damper solution - lower energy savings
2 IGV solution - high installation cost
3 VLT solution - maximum energy savings
Illustration 4.8 Comparative Energy Consumption for Energy
Saving Systems, Input Power (%) vs Volume (%)
Discharge dampers reduce power consumption somewhat.
Inlet guide vans offer a 40% reduction but are expensive
to install. The Danfoss frequency converter solution
reduces energy consumption with more than 50% and is
easy to install.
4.2.5 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 savings in excess of 50%
at the given flow distribution over a year. The payback
period depends on the price per kWh and the price of the
frequency converter. In this example, payback is achieved
in less than 1 year, when compared with valves and
constant speed. For calculation of energy savings in
specific applications, use the VLT
®
Energy box software.
Energy savings
P
shaft
=P
shaft output
500
[h] t
1000
1500
2000
200 100 300
[m 3 /h]
400
Q
175HA210.11
Illustration 4.9 Flow Distribution over 1 Year
175HA209.11
60
50
40
30
20
10
H
s
0 100 200 300 400
(mwg)
B
C
A
750rpm
1050rpm
1350rpm
1650rpm
0
10
20
30
(kW)
40
50
60
200 100 300
(
m 3 /h
)
(
m 3 /h
)
400
750rpm
1050rpm
1350rpm
1650rpm
P
shaft
C 1
B
1
A 1
Illustration 4.10 Pump Performance
Application Examples Design Guide
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