As the graph shows, more than 50% energy savings can be
achieved in typical applications.
130BA782.10
Discharge
damper
Less energy savings
IGV
Costlier installation
Maximum energy savings
Figure 2.4 The Three Common Energy Saving Systems
Figure 2.5 Energy Savings
Discharge dampers reduce power consumption somewhat.
Inlet guide vans offer a 40% reduction but are expensive
to install. The Danfoss adjustable frequency drive solution
reduces energy consumption with more than 50% and is
easy to install.
2.6.5 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 pay back
period depends on the price per kWh and price of the
adjustable frequency drive. In this example, it is less than a
year when compared with valves and constant speed.
Energy savings
P
shaft
=P
shaft output
500
[h]
P
1000
1500
2000
200100 300 [m
3
/h]400
Q
175HA210.10
Figure 2.6 Flow Distribution over 1 Year
Product Overview Design Guide
14 Danfoss A/S © Rev. 2014-01-14 All rights reserved. MG18C522
22
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