CO2 REFRIGERATION SYSTEM FOR ICE-PLAYING SURFACES
A CO2 refrigeration system comprises a condensation reservoir. CO2 refrigerant is accumulated in the reservoir. The CO2 refrigerant circulates between supracompression and evaporation loops. The supracompression loop comprises a compression stage for compression CO2 refrigerant to a supracompression state, a cooling stage in which CO2 refrigerant releases heat, and a pressure-regulating unit in a line extending from the cooling stage to the condensation reservoir. The pressure-regulating unit maintains a pressure differential between the cooling stage and the condensation reservoir. The evaporation loop comprises an evaporation stage in which CO2 refrigerant from the condensation reservoir absorbs heat in a heat exchanger. The heat exchanger is connected to an ice-playing surface refrigeration circuit. A second refrigerant cycles in the ice-playing surface refrigeration circuit. The CO2 refrigerant absorbs heat from the second refrigerant in the heat exchanger. A CO2 condensation exchanger is also provided.