Isection I: User; I.1 Versions Available; I.2 Adaptivefunction Plus - Hitecsa EWNLM 115 Manuel D'utilisation

I SECTION I: USER
I.1 VERSIONS AVAILABLE
The available versions belonging to this product range are listed below.
After having identified the unit, use the following table to find out about
some of the machine's features.
n° compressors
1
1
1
1
2
2
(*)The power value used to identify the model is approximate. For the
exact value, identify the machine and consult the attachments (A1
Technical Data).
P
With circulating pump
I.2 ADAPTIVEFUNCTION PLUS
Objectives
To guarantee optimal unit operation in the system in which it is
installed. Evolved adaptive logic.
To obtain the best performance from a chiller in terms of energy
efficiency at full and partial capacities. Low consumption chiller.
Operating logic
In general, the actual control logics on water chillers/heat pumps do not
consider the features of the system in which the units are installed; they
usually regulate the return water temperature and are positioned so as
to ensure the operation of the chillers, giving less priority to the system
requirements.
The new AdaptiveFunction Plus adaptive logic counters these logics
with the objective of optimising the chiller operation on the basis of the
system features and the effective thermal load. The controller regulates
the delivery water temperature and adjusts itself, as and when required,
to the relative operating conditions using:
the information contained in the return and delivery water
temperature to estimate the working conditions thanks to a particular
mathematical formula;
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.
Cooling capacity (kW) (*)
15
18
22
25
30
40
Main functions
Efficiency or Precision
Thanks to the evolved control, it is possible to run the chiller on two
different regulation settings to obtain the best possible performance in
terms of energy efficiency and considerable seasonal savings or high
water delivery temperature precision:
1. Low consumption chiller: "Economy" Option
It is well known that chillers work at full capacity for just a very small
percentage of their operating time, while they work at partial capacity
for most of the season. Therefore, the power they need to supply
generally differs from the nominal design power, and operation at
partial capacity has a noticeable effect on seasonal energy
performance and consumption.
This makes it necessary to run the unit so that it is as efficient as
possible at partial capacity. The controller therefore ensures that the
water delivery temperature is as high as possible (when operating as
a chiller) or as low as possible (when operating as a heat pump)
whilst compatible with the thermal loads, meaning that it is on a
sliding scale, unlike in traditional systems. This prevents energy
wastage linked to the maintenance of pointlessly onerous
temperature levels for the chiller, ensuring that the ratio between the
power to be supplied and the energy to be used to produce it is
always at an optimum level. Finally the right level of comfort is
available to everyone!
Summer season: the unit that operates with a sliding set-point allows
seasonal energy savings of around 8% compared to a traditional unit
that operates with a fixed set-point.
Y
900
800
700
600
500
400
300
200
100
0
3
4
X Year divided into months (1 January, 2 February, etc.).
Y Energy consumption (kWh).
Unit with fixed set-point
Unit with sliding set-point
Winter season: the unit that operates with a sliding set-point allows
seasonal energy savings of around 13% compared to a traditional unit
that operates with a fixed set-point and executed calculations
demonstrate that seasonal consumption is equal to those of a
machine in CLASS A.
Y
1600
1400
1200
1000
800
600
400
200
0
9
10
X Year divided into months (1 January, 2 February, etc.).
Y Energy consumption (kWh).
Unit with fixed set-point
Unit with sliding set-point
24
SECTION I: USER
5 6
7
8
9
10
X
11
12
1
2
3
4
X