Danfoss FC 101 Design Manual page 16
Vlt hvac basic drive fc 101
frequency converter
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Also See for FC 101:
- Design manual (132 pages) ,
- Programming manual (124 pages) ,
- Operating manual (84 pages)
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Product Overview
100
2
2
80
60
40
20
0
0
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.
2.6.5 Example with Varying Flow over 1
Year
This example is calculated based on pump characteristics
obtained from a pump datasheet.
The result obtained shows energy savings in excess of 50%
at the given flow distribution over a year. The pay back
period depends on the price per kWh and price of
frequency converter. In this example it is less than a year
when compared with valves and constant speed.
Energy savings
P
=P
shaft
shaft output
Illustration 2.6 Flow Distribution over 1 Year
14
VLT
Discharge Damper Solution
IGV Solution
VLT Solution
60
0
60
0
Volume %
®
HVAC Basic Drive FC 101 Design Guide
H
(mwg)
s
60
50
40
30
20
10
0
P
(kW)
shaft
60
60
50
40
30
20
10
0
Illustration 2.7 Energy
Distri-
m
3
/
bution
h
%
Hours
350
5
300
15
1314
250
20
1752
200
20
1752
150
20
1752
100
20
1752
Σ
100 8760
Table 2.4 Result
2.6.6 Better Control
If a frequency converter is used for controlling the flow or
pressure of a system, improved control is obtained.
A frequency converter can vary the speed of the fan or
pump, obtaining variable control of flow and pressure.
Furthermore, a frequency converter can quickly adapt the
speed of the fan or pump to new flow or pressure
conditions in the system.
Simple control of process (Flow, Level or Pressure) utilising
the built-in PI control.
MG18C502 - Rev. 2013-09-06
B
1350rpm
C
1050rpm
750rpm
100
200
300
1350rpm
B
1
1050rpm
C
1
750rpm
100
200
300
Valve regulation
Frequency converter
Power
Consump-
Power
tion
A
- B
kWh
A
1
1
438
42.5
18.615
38.5
50.589
35.0
61.320
31.5
55.188
28.0
49.056
23.0
40.296
275.064
A
1650rpm
(
3
)
m
/h
400
A
1
1650rpm
(
)
400
m
3
/h
control
Consump-
tion
- C
kWh
1
1
42.5
18.615
29.0
38.106
18.5
32.412
11.5
20.148
6.5
11.388
3.5
6.132
26.801
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