Adaptivefunction Plus; Operating Logic - Hitecsa EQPL-B 4360 Manual Del Operador

I.4

ADAPTIVEFUNCTION PLUS

The new adaptive regulation logic AdaptiveFunction Plus is an
exclusive patent. The various algorithm processing and development
operations were implemented and tested on the new ADVANCE range
in the R&D Laboratory of HITECSA by means of numerous test
campaigns.
Objectives
 To always guarantee optimal unit operation in the system in which it
is installed. Evolved adaptive logic.
 Obtaining 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 chillers/heat pumps do not
consider the features of the system in which the units are installed; they
usually control the return water temperature and there aim is to
guarantee the operation 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
characteristics 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
function;
 a special adaptive algorithm that uses this estimate to vary the start-
up and switch-off threshold values and position of the compressors;
optimised compressor start-up control guarantees maximum precision
in the water supplied to the utility, thereby 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
control settings in order to obtain the best possible performance in
terms of energy efficiency and therefore, significant seasonal savings or
high water delivery temperature 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
temperature 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!
2. High precision: "Precision" Option
In this operating mode, the unit works at a fixed set-point and, thanks
to the water flow temperature control and the advanced control logic,
at loads ranging between 50% and 100%, it is possible to guarantee
an average fluctuation from the utility water supply temperature of
approximately ± 1,5°C with respect to the set-point value compared
to an average fluctuation of approximately ± 3°C, which is normally
obtained with standard return control.
Therefore, the "Precision" option guarantees precision and reliability
in all applications that require a controller that guarantees a more
accurate constant 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 system thermal inertia.
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SECTION I :: USER