In the present paper, a CO_2 commercial refrigeration unit serving a 1500 m~2 supermarket located inSouthern Europe is presented.The unit consists of a booster compressor rack with parallel compression, with ten compressorsarranged to provide around 20 kW cooling capacity at low temperature and 90 kW cooling capacityat medium temperature. The system, in addition to the cooling load, provides all the thermal functionsin one unit: it integrates a heat exchanger for the air conditioning (130 kW) and two stages heatrecovery, for sanitary hot water production (20 kW) and for space heating (100 kW).The refrigeration unit is fully equipped with pressure and temperature sensors, flow meters, powerconsumption and capacities analysers.The monitoring data are useful to understand how the considered system operates under differentboundary conditions across a year. The focus of this paper is on the performance of the systemduring the winter period when some heat is recovered from the cycle for space heating purposes.
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