Application notes Application notes

Application notes
Ascon Spa
High efficiency cooling plant for cold stores for the conservation of fruits and
vegetables
Saving energy is a vital demand of modern society. However, the performance of systems
used in food processing cannot be compromised in this effort. Manufacturers of
refrigerating equipment for food storage have become increasingly sensitive to this need
and have developed solutions that combine energy savings with the ability to obtain the
highest-quality products.
The plant is based on a new concept that includes a harvesting plant, a pre-refrigeration
area, a conservation area, and a processing area for fruits and vegetables. The scope is to
increase the processing rates of the plant drastically while keeping energy consumption
the same as the plant’s existing energy consumption. Also required is the flexibility to
process different types of fruits and vegetables in the plant, along with the ability to use the
cold storage rooms for both the conservation and pre-refrigeration stages.
Plant and Control System Solution
The cooling system is an indirect expansion type and includes low-temperature glycol
chillers with high coefficient of performance connected to one evaporative cooler with an
intermediate heat exchanger.
One AC Station Multi-loop Multifunction Programmable controller acting on the
inverters of the primary and secondary loop pumps assures the control of the machines.
Other AC Stations are dedicated to control of:
o the temperature and humidity of each cold room acting on the three-way mixing
control valve of the air refrigerator units;
o the temperature of the icy water of the hydro-cooler for the pre-refrigeration of the
fruits;
o the temperature and humidity of the processing room to meet the conditions
necessary for areas in which people have to work. In accordance with the Hazard
Analysis and Critical Control Point (HACCP) regulations for food safety,
The 72X144mm screens of the AC Station controllers guarantee the local operator
interface while supervision, is performed by the AUTOLINK software (SCADA).
Temperatures are measured by resistance temperature detectors (RTDs) of the ZTR
series with class 1/3 DIN accuracy while, the relative humidity, is measured by the H1
series transmitters.
The following Ascon’s products have been used:
o Multi loop Multifunction Programmable Loop Controllers model AC20-300000 of the
AC Station series with analogical and digital function blocks including four PID
loops.
o Humidity transmitters of the H1 series featuring long-term stability; reliable
measurements; long-life, interchangeable filters for different applications; and the
ability to be replaced with no recalibration.
o Resistance temperature detectors (RTDs) of the ZTR series
Customer: ORTIZ Srl, Bari, Italy
http://www.ortizsrl.it/
EVERYTHING UNDER CONTROL
ASCON Spa
Via Falzarego, 9/11
20021 Bollate (Milan) Italy
Tel.+39-02-333371
Fax+39-02-3504243
E-mail [email protected]
www.ascon.it