Danfoss VLT FC51 Design Manual page 15

Safety and Conformity
2.7.3 Example of Energy Savings
As shown in Illustration 2.3, the flow is controlled by
changing the RPM. By reducing the speed only 20% from
the rated speed, the flow is also reduced by 20%. This is
because the flow is directly proportional to the RPM. The
consumption of electricity, however, is reduced by 50%.
If the system in question only needs to be able to supply a
flow that corresponds to 100% a few days in a year, while
the average is below 80% of the rated flow for the
remainder of the year, the amount of energy saved is even
more than 50%.
Illustration 2.3 describes the dependence of flow, pressure
and power consumption on RPM.
100%
80%
Flow ~n
50%
25%
12,5%
50%
Illustration 2.3 Laws of Proportionally
Q 1 n 1
Flow : =
Q 2 n 2
H 1 n 1 2
Pressure :
=
H 2 n 2
P 1 n 1
3
Power :
=
P 2 n 2
Q=Flow P=Power
Q =Rated flow P
1 1
Q =Reduced flow P
2 2
H=Pressure n=Speed regulation
H =Rated pressure n
1 1
H =Reduced pressure n
2 2
Table 2.4 The Laws of Proportionality
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 built-in facility
that enables the frequency converter to function as a
Building Management System, BMS.
®
VLT Micro Drive FC 51 Design Guide
Pressure ~n 2
3
Power ~n
n
80% 100%
=Rated power
=Reduced power
=Rated speed
=Reduced speed
MG02K302 - Rev. 2013-12-03
Illustration 2.5 shows 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.
Discharge
damper
Less energy savings
IGV
Costlier installation
Illustration 2.4 The 3 Common Energy Saving Systems
100
Discharge Damper Solution
IGV Solution
80
VLT Solution
60
40
20
0
0 60 0
Volume %
Illustration 2.5 Energy Savings
Discharge dampers reduce power consumption. 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.
Maximum energy savings
60 0 60
13
2 2