Specifications

n
100%
50%
25%
12,5%
50% 100%
80%
80%
175HA208.10
Power ~n
3
Pressure ~n
2
Flow ~n
Illustration 2.5 Laws of Proportionality
2.7.4 Comparison of Energy Savings
The Danfoss frequency converter solution offers major
savings compared with traditional energy saving solutions.
The frequency converter is able to control fan speed
according to thermal load on the system and it has the
ability to function as a Building Management System
(BMS).
The graph (Illustration 2.6) shows typical energy savings
obtainable with 3 well-known solutions when fan volume
is reduced to 60%.
As the graph shows, more than 50% energy savings can be
achieved in typical applications.
130BA779.11
0 60060060
0
20
40
60
80
100
Discharge Damper Solution
IGV Solution
VLT Solution
Energy consumed
Energy consumed
Energy consumed
Input power %
Volume %
Illustration 2.6 Three Common Energy Saving Systems
Discharge dampers reduce power consumption. Inlet guide
vanes offer a 40% reduction but are expensive to install.
The Danfoss frequency converter solution reduces energy
consumption by more than 50% and is easy to install.
Introduction VLT® HVAC Drive FC 102 Design Guide
20 MG16C102 - Rev. 2013-08-20
2
2