Italian supermarket, Gruppo Maxi Di has chosen Arneg to develop its entire food refrigeration system and to equip its new store with Arneg refrigerated cabinets.

Maxi Di’s goal was to create an environmentally-sustainable system, using a zero-impact gas. Arneg partnered with Carel to create a tailor-made solution that feature modulating ejector technology.

The medium-sized store (2,300 square metres) has an Arneg Booster transcritical compressor rack that uses CO2, carbon dioxide, as the refrigerant.

Equipped with eight compressors, Carel electronics and ejectors Arneg has supplied more than 50 refrigerated cabinets - 44 medium temperature and 13 low temperature.

All the cabinets are equipped with Carel’s MPX PRO, the compact and flexible controller that effectively combines ease-of-use, stable control and energy savings.

The CO2 compressor rack is controlled by the pRack pR300T, three Carel EmJ modulating ejectors, with a total capacity of 185 kW.

With the compressor rack operation in ejector mode the integrated solution can reduce the cabinet superheat set point down to 0.5°K.

In this way, the evaporators work in a semi-flooded mode with a higher pressure set point, optimising compressor rack operation and reducing the energy consumption of the entire system.

This solution brings energy savings during the summer of up to of 25%, when the outdoor temperature is higher, but also in winter, via the heat recovery system that provides heating inside the building.

One essential feature of the ejector solution is continuous modulation which allows the system to continuously adapt to the variations in operating conditions that are typical of refrigeration systems.

The entire system is supervised by Arneg service through its IRIS Energy control centre, optimising performance and ensuring there is no wastage thanks to the Carel boss supervisor, which also provides predictive maintenance.

Arneg's refrigeration engineering director, Enrico Zambotto, said Arneg has been working with Carel for many years on its innovative partnership.

“Technological innovation has allowed us over time to offer increasingly efficient and environmentally-friendly solutions, just like the one at the Famila supermarket,” he said.

“Now we are using ejectors in other installations and always using natural refrigerants at numerous stores in Italy”.


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