Danfoss VLT Micro Drive PK18, Руководство по конструкции

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n
100%
50%
25%
12,5%
50% 100%
80%
80%
175HA208.10
Power ~n 3
Pressure ~n
2
Flow ~n
Illustration 2.3 Laws of Proportionally
Flow :
Q1
Q2
=
n1
n2
Pressure :
H1
H2
=
(
n1
n2
)
2
Power :
P1
P2
=
(
n1
n2
)
3
2.5.4 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.
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.
130BA782.10
Discharge
damper
Less energy savings
IGV
Costlier installation
Maximum energy savings
Illustration 2.4 The Three Common Energy Saving Systems
130BA779.11
0 60 0 60 0 60
0
20
40
60
80
100
Discharge Damper Solution
IGV Solution
VLT Solution
Ener
gy c
onsumed
Ener
gy c
onsumed
Ener
gy c
onsumed
Input po
w
er %
Volume %
Illustration 2.5 Energy Savings
Discharge dampers reduce power consumption somewhat.
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.
Safety and Conformity VLT Micro Drive Design Guide
14 MG02K102 - VLT
®
is a registered Danfoss trademark
2 2