Danfoss VLT HVAC Design Manual page 21

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VLT HVAC Drive Design Guide
2.7.4 Comparison of Energy Savings
The Danfoss frequency converter solution offers major savings compared
with traditional energy saving solutions. This is because the frequency
converter is able to control fan speed according to thermal load on the
system and the fact that the frequency converter has a build-in facility
that enables the frequency converter to function as a Building Manage-
ment System, BMS.
The graph (Illustration 2.7) illustrates typical energy savings obtainable
with 3 well-known solutions when fan volume is reduced to i.e. 60%.
As the graph shows, more than 50% energy savings can be achieved in
typical applications.
Flow :
Pressure
Power
Illustration 2.6: The three common energy saving systems.
MG.11.B9.02 - VLT ® is a registered Danfoss trademark
2 Introduction to VLT HVAC Drive
Q n
1 1
=
Q n
2 2
( )
H n
2
1 1
: =
H n
2 2
( )
P n
3
1 1
: =
P n
2 2
2
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