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I.3 AdaptiveFunction Plus
The new AdaptiveFunction Plus adaptive control logic is an exclusive
HITECSA patent. The various algorithm processing and development
operations have been implemented and tested on the ADVANCE range of
units in the HITECSAResearch&Development Laboratory by means of nume-
rous test campaigns.
Objectives
• To always guarantee optimal unit operation in the system in which it is
installed. Evolved adaptive logic.
• To achieve the best performance from a chiller and a heat pump in terms
of energy efficiency with full and partial loads. Low consumption chillers.
Operating logic
In general, the actual control logics on chillers/heat pumps do not consider
the features of the system in which the units are installed; they usually con-
trol the return water temperature and there aim is to guarantee the opera-
tion of the chillers, giving less priority to the system requirements.
The new AdaptiveFunction Plus adaptive logic contrasts these logics with
the objective of optimising chiller operation according to the system cha-
racteristics and the actual thermal load. The controller regulates the flow
water temperature and adjusts itself according to the operating conditions
using:
• the information contained in the return and flow water temperature to
estimate the load conditions, thanks to a particular mathematical fun-
ction;
• a special adaptive algorithm that uses this estimate to vary the values and
the start-up and switch-off limit values of the compressors; the optimised
compressor start-up management guarantees a precision water supply
to the user, reducing the fluctuation around the set-point value.
Main functions
Efficiency or Precision
Thanks to the advanced control, the chiller can run on two different regu-
lation settings in order to obtain the best possible performance in terms of
energy efficiency and significant seasonal savings or high water tempera-
ture precision:
1. Low consumption chillers: "Economy" option
It is known that chillers work at full load for only a very small percentage of
their operating time and at partial load for most of the season. Therefore, the
power they must supply generally differs from the nominal design power,
and partial load operation significantly affects seasonal energy performance
and consumption.
This makes it necessary for the unit to run as efficiently as possible with
partial loads. The controller therefore ensures that the water flow tempera-
ture is as high as possible (when operating as a chiller) or as low as possible
(when operating as a heat pump) whilst being compatible with the thermal
loads, which means it shifts, unlike traditional systems. This prevents energy
waste associated with the unnecessarily onerous chiller temperature levels
being maintained, thereby guaranteeing that the ratio between the power
to be supplied and the energy to be used to produce it is always optimised.
The right level of comfort is finally available to everyone!
1. High precision: "Precision" option
With this operating method, the unit works at a fixed set-point.
Therefore, the "Precision" option guarantees precision and reliability in all
applications that require a controller that guarantees a more accurate con-
stant water supply temperature, and where particular humidity control is
required. However, it is always recommended to use a storage tank with
greater system water content in process applications to guarantee high sy-
stem thermal inertia.
EQPI3X
I.4 Functioning limits
Summer mode (270÷2100)
Tmax (4)
Tmax (2)
Tmax (3)
Summer mode (2115÷2130)
Tmax (4)
Tmax (2)
Tmax (3)
Tuc
55
53
50
25
20
0
AUTOMATIC 1
AUTOMATIC 1
SUMMER+RECOVERY
AUTOMATIC 2 mode
x
5
10
18
Tue
EN
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