Comparison Of Energy Savings - Danfoss VLT HVAC Basic Drive FC 101 Design Manual

Product Overview
100%
80%
3 3
Flow ~n
50%
25%
12,5%
Illustration 3.3 Laws of Proportionally
Q n
1 1
Flow : =
Q n
2 2
H n
1 1
Pressure : =
H n
2 2
3
P n
1 1
Power : =
P n
2 2
Q = Flow
Q = Rated flow
1
Q = Reduced flow
2
H = Pressure
H = Rated pressure
1
H = Reduced pressure
2
Table 3.1 The Laws of Proportionality

3.1.4 Comparison of Energy Savings

The Danfoss frequency converter solution offers major
savings compared with traditional energy saving solutions
such as discharge damper solution and inlet guide vanes
(IGV) solution. This is because the frequency converter is
able to control fan speed according to thermal load on the
system, and the frequency converter has a built-in facility
that enables the frequency converter to function as a
building management system, BMS.
Illustration 3.3 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.
14
Pressure ~n
3
Power ~n
50% 80%
2
P = Power
P = Rated power
1
P = Reduced power
2
n = Speed control
n = Rated speed
1
n = Reduced speed
2
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®
VLT HVAC Basic Drive FC 101
Discharge
damper
2
n
100%
Costlier installation
Illustration 3.4 The 3 Common Energy Saving Systems
100
80
60
40
20
0
Illustration 3.5 Energy Savings
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 with more than 50% and is easy to install. It
also reduces noise, mechanical stress, and wear-and-tear,
and extends the life span of the entire application.
Less energy savings
IGV
Discharge Damper Solution
IGV Solution
0 60 0 60
Volume %
Maximum energy savings
VLT Solution
0 60
MG18C702