C0240111-04-05-GB
Tin/Tout
ZONA NEUTRA
Setpoint
Attivazione compressori
Disattivazione compressori
ESTATE
Compressors deactivated
SUMMER
Compressors activated
DEAD AREA
Tin/Tout
ZONA NEUTRA
Setpoint
Attivazione compressori
Disattivazione compressori
INVERNO
WINTER
DEAD AREA
Compressors deactivated
Compressors activated
Figure 5.3
: QUICK MIND adjustment model (summer and winter
)
The setpoint remains within a dead area. If the temperature also remains within this area, no change is
made to the number of active compressors.
When the temperature leaves the dead area following a change in system load, the compressors are
either activated or deactivated in order to return the temperature to the dead area.
The amplitude of the dead area depends on the dynamic characteristics of the system and, in particular,
on the amount of water it contains and the load. The self-adapting algorithm is able to “measure” system
dynamics and calculate the minimum dead area in order to respect compressor activation times and the
maximum number of start-ups per hour.
Both return and delivery temperatures can be adjusted.
Special functions are also present which reduce the number of compressor start-ups in the event of very
low loads or start-ups of units with significantly higher or lower temperatures than the setpoint.
2 compressors - with maximum permitted number of start-ups per hour 8
Litres/kW
10.5
9.5
8.5
7.5
6.5
5.5
4.5
3.5
2.5
'7
out
3.2
3.2
3.4
3.4
3.6
3.8
4.0
4.4
5.2
2 compressors - with maximum permitted number of start-ups per hour 12
Litres/kW
10.5
9.5
8.5
7.5
6.5
5.5
4.5
3.5
2.5
'7
out
3.0
3.0
3.0
3.2
3.2
3.4
3.6
3.8
4.3
4 compressors - with maximum permitted number of start-ups per hour 8
Litres/kW
10.5
9.5
8.5
7.5
6.5
5.5
4.5
3.5
2.5
'7
out
1.8
1.8
1.8
1.8
1.8
1.9
2.0
2.3
2.7
4 compressors - with maximum permitted number of start-ups per hour 12
Litres/kW
10.5
9.5
8.5
7.5
6.5
5.5
4.5
3.5
2.5
'7
out
1.8
1.8
1.8
1.8
1.8
1.9
2.0
2.3
2.7
Table 5.3:
maximum theoretical delivery temperature range at constant part load (depending on the quantity of water
contained in the system)
An example of real data acquired during operation with the Quick Mind adjuster on the delivery side is
shown below.
Reference is made to figure 5.4.
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