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I
SECTION I: USER
I.1
AVAILABLE VERSIONS
The available versions belonging to this product range are listed below.
After having identified the unit, you can use the following table to find
out about some of the machine's features.
T
Water production unit
C
Cooling only
A
Air-cooled
E
Scroll-type hermetic compressors
Y
R410A refrigerant fluid
Model
No. compressors
118
1
121
1
128
1
131
1
135
1
140
1
253
2
261
2
270
2
(*) The power value used to identify the model is approximate. For the
exact value, identify the machine and consult the enclosed documents
(A1
Technical data).
Possible installations for TCAEY 253-261-270 models:
ASDP1 – Installation with double pump, including an automatically
activated pump in stand-by and water buffer tank.
I.2
ADAPTIVEFUNCTION PLUS
The new adaptive regulation logic, AdaptiveFunction Plus, is an
exclusive
patent and the result of a long partnership with the
RHOSS
University of Padua. The various algorithm processing and
development operations were implemented and tested on TCAEY units
in the
S.p.A. Research&Development Laboratory by means of
RHOSS
numerous test campaigns.
Objectives
• To guarantee optimal unit operation in the system in which it is
installed and high water delivery temperature precision.
High precision
The unit works at a fixed set-point and, thanks to the delivery water
temperature control and the evolved regulation logic, at a capacity of
between 50% and 100% it is possible to guarantee an average
fluctuation from the water supply temperature of approximately ±
1.5°C from the set-point value compared to an average fluctuation
over time of approximately ± 3°C, which is normally obtained with
standard return control.
This guarantees precision and reliability for all those applications that
require a regulator that guarantees a more accurate constant water
supply temperature, and where there are particular damp control
requirements. However, in process applications it is always advisable
to use units with a water buffer tank to guarantee higher system
thermal inertia.
s
s
Fluctuation
FC
Load
Unit with water buffer tank, 4 litres/kW in the system and
return control.
Unit with water buffer tank, 2 litres/kW in the system and
control on the supply side with AdaptiveFunction Plus.
Cooling capacity (kW) (*)
18
21
28
31
35
40
53
61
70
The chart illustrates the fluctuations of the water temperature from the
set value for the various capacities, demonstrating how a unit with
delivery control and the AdaptiveFunction Plus guarantees greater
water supply temperature precision.
Virtual Tank: guaranteed reliability
A low water content in the system can cause the chiller units to be
unreliable and can generate system instability and lack of performance.
Thanks to the Virtual Tank function, this is no longer a problem. The
unit can operate in systems with just 2 litres/kW in the pipes given that
the control is able to compensate for the lack of inertia specific to a
water buffer tank, "muffling" the control signal, preventing the
compressor from switching on and off in an untimely fashion and
reducing the average fluctuation of the set-point value. However, in
process applications it is always advisable to use units with a water
buffer tank to guarantee higher system thermal inertia.
T
14
12
10
8
6
4
2
0
2000
3000
T
Water temperature (°C)
t
Time (s)
T1
Set-point temperature
Delivery temperature with Virtual Tank.
Delivery temperature without Virtual Tank.
The chart shows the various chiller outlet temperatures considering
capacity of 80%. We can observe how the temperatures of the unit with
AdaptiveFunction Plus logic and the Virtual Tank function is far less
varied and more stable over time, with average temperatures closer to
the working set-point compared to a unit without the Virtual Tank
function. Moreover, we can see how the unit with AdaptiveFunction
Plus logic and the Virtual Tank function switches the compressor on
less often over the same period of time, with obvious advantages in
terms of energy consumption and system reliability.
ACM Autotuning compressor management
AdaptiveFunction Plus enables the units to adapt to the system they
are serving, so as to always identify the best compressor operating
parameters in the different working conditions.
During the initial operating phases, the special "Autotuning" function
enables the Compact-Y unit with AdaptiveFunction Plus to estimate
the thermal inertia characteristics that regulate the system dynamics.
The function, which is automatically activated when the unit is switched
on for the first time, executes a number of set operating cycles, during
which it processes the information relative to the water temperatures. It
is thus possible to estimate the physical characteristics of the system
and to identify the optimal value of the parameters to be used for the
control.
At the end of this initial auto-estimate phase, the "Autotuning" function
remains active, making it possible to adapt the control parameters
quickly to every change in the water circuit and thus in the system water
contents.
FC
41
4000
5000
6000
7000
SECTION I: USER
T1
t
8000
9000
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