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Frigo-Consulting
Refrigeration Consulting & Engineering
SELGROS TARGU MURES:
NOW IMPLEMENTING BEST IN CLASS TECHNOLOGY
For the new store concept, Selgros Romania (part of the Transgourmet Group) has
chosen to implement a complete CO2 ejector booster together with a CO2 chiller.
The new store is located in the middle of Romania, in
Transilvania region. The new concept has a sales area
of approx. 3500 m2.
An advanced CO2 booster rack, which supplies 127
meters of medium and low temperature cabinets as
well as 268 m2 of cold rooms and freezers with cooling
capacity, has been installed. The booster rack is ready
to deliver up to 154 kW for medium and 44 kW low
temperature cooling capacity.
The implemented gas and liquid ejectors in combination
with parallel compressors allow to recover the energy
release during the high pressure expansion and to
reduce internal throttling losses. Driven by the pressure
difference in the refrigeration system between highand receiver pressure, the ejectors convey liquid or
gaseous refrigerant.
The ejectors allow to increase system efficiency by
raising the medium suction pressure of the positive
temperature range from -6°C up to -2°C, depending on
the evaporator performance. Thanks to expansion
operation in partially flooded mode, the heat transfer
properties of CO2 are increasing tremendously, thus
allowing the increase of the evaporation temperature.
Due to the liquid separator on the suction side of the
negative temperature range, the evaporation pressure
for the LT-side can be raised from -30°C to -26°C.
All this is possible with the use of partially flooded
evaporators.
Energy savings reach up to 25% compared to traditional
CO2-systems as has already been measured for more
than one year in two similar installations in Switzerland.
Figure 1
The pressure-enthalpy diagram shows the possible increase
in the evaporation pressure and medium pressure thanks to
the liquid ejectors as compared to a traditional system with
parallel compression (dotted in red). The red arrow describes
the pre-compression of gaseous CO2 by the gas ejectors.
Figure 2
Selgros Targu Mures booster system – multi-ejector.
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In addition to the high efficient refrigeration generation,
these CO2 installations are providing heat recovery for
tap hot water and for facility heating that covers the
sales and office area. Using the waste heat, that
previously was emitted to the environment, contributes
to the reduction of the carbon footprint and the
installation’s energetic balance.
Figure 4
Selgros Targu Mures chiller rack.
Figure 3
The enhanced system at Selgros Targu Mures with multiejectors and an additional liquid separator in the suction line
for medium and low temperature.
NOT ONLY REFRIGERATION
Considering the legislative restrictions of the F-Gas
regulation regarding refrigerants with significant
impact on global warming and the progress in
refrigeration technology, CO2 as a natural refrigerant
has been established in commercial and industrial
refrigeration applications.
After an intensive collaboration between FrigoConsulting and ENEX (rack supplier), the first CO2
transcritical chiller for Air-Conditioning with overfeed
evaporators is in operation and covers completely the
sales and offices area.
THE ROLE OF FRIGO-CONSULTING
Frigo-Consulting offers services in the field of innovative
refrigerating systems for:
Design of energy concepts
Engineering and realisation of sustainable refrigerating
systems
Design of efficient heat recovery and integral systems
Unique innovations to save primary energy
Training and audits
May 2016, Cristina Constantinescu / Cristian Groseanu
Main data of the CO2 chiller
HT capacity
225 kW at +6 °C
Chiller rack features
4 x HT compressor
Evaporators
2 x gravity overfeed
Designed
pressure 80bar/80bar/130bar
HT/IP/HP
Frigo-Consulting
SWITZERLAND
Refrigeration Consulting & Engineering
Lausanne
Chemin de la Colice 4, CH-1023 Crissier, Tel: +41 21 633 44 66
Feldstrasse 30
Postfach
CH-3073 Gümligen, Bern
Telephone +41 31 996 48 48
Fax
+41 31 996 48 58
info@frigoco nsulting.com
www.fri gocons ulting.com
Zurich
Lerzenstrasse 8, CH-8953 Dietikon 1, Tel: +41 44 732 46 46
INTERNATIONAL
Italy
via Zamenhof, 817, 36100 Vicenza, Tel: +39 0444 162 06 50
Poland
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Pta. Montreal 10, WTCB, 011469 Bucuresti, Tel: +40 724 059 998
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