Example With Varying Flow Over 1 Year - Danfoss VLT DriveMotor FCP 106 Design Manual

Application Examples
be achieved by applying a VLT
applications.
100
1
80
2
60
40
20
0
0 60
0
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 drive 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 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 the drive. 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 =P
shaft shaft output
MG03M302
Design Guide
®
solution in typical
3
60 0 60
%
Danfoss A/S © 12/2018 All rights reserved.
[h] t
2000
1500
1000
500
100 200
Illustration 4.9 Flow Distribution over 1 Year
H
(mwg)
s
60
50
B
40
30
20
C
10
750rpm
0 100 200
P
(kW)
shaft
60
50
40
30
1
B
20
10
1050rpm
C 1
750rpm
0 100 200
Illustration 4.10 Pump Performance
Q
300 400
[m 3 /h]
A
1650rpm
1350rpm
1050rpm
( )
3
m /h
300 400
A 1
1650rpm
1350rpm
( )
300 400 m 3 /h
43
4 4