Co2 refrigeration system for ice-playing surface

Abstract

A CO 2 refrigeration system for an ice-playing surface comprises a transfer circuit, a CO 2 refrigerant circuit and an independent condensation circuit. A transfer refrigerant circulates between a condensation heat exchanger and an evaporation heat exchanger. The CO 2 circuit is in relation with the condensation heat exchanger to release heat from the CO 2 refrigerant. The CO 2 circuit comprises a CO 2 condensation reservoir and an evaporation stage to receive the CO 2 refrigerant from the condensation reservoir. The independent circuit is in relation with the refrigerant of the transfer circuit at the evaporation heat exchanger. The independent circuit comprises a magnetically operated compressor to compress a secondary refrigerant, a condensation stage and an evaporation stage in which the secondary refrigerant absorbs heat.

1 . A CO 2  refrigeration system for an ice-playing surface, comprising:
 a transfer circuit in which a transfer refrigerant circulates between a condensation heat exchanger to absorb heat, and an evaporation heat exchanger to release heat;   a CO 2  refrigerant circuit in heat-exchange relation with the condensation heat exchanger to release heat from the CO 2  refrigerant, the CO 2  refrigerant circuit comprising:
 a condensation reservoir accumulating a portion of the CO 2  refrigerant in a liquid state; 
 an evaporation stage receiving the CO 2  refrigerant from the condensation reservoir to absorb heat from the ice-playing surface; 
   an independent condensation circuit in heat-exchange relation with the transfer refrigerant of the transfer circuit at the evaporation heat exchanger, the independent condensation circuit comprising:
 a compression stage with at least one magnetically operated compressor to compress a secondary refrigerant; 
 a condensation stage in which the secondary refrigerant releases heat; and 
 an evaporation stage in which the secondary refrigerant is in heat-exchange relation with the transfer refrigerant of the transfer circuit at the evaporation heat exchanger to absorb heat therefrom. 
   
     
     
         2 . The CO 2  refrigeration system according to  claim 1 , further comprising a line extending from a top of the condensation reservoir to the heat exchanger, such that gaseous CO 2  refrigerant in the condensation reservoir is directed to the independent condensation circuit. 
     
     
         3 . The CO 2  refrigeration system according to  claim 1 , wherein the condensation heat exchanger is positioned in a line extending from the condensation reservoir to the evaporation stage. 
     
     
         4 . The CO 2  refrigeration system according to  claim 1 , wherein the condensation heat exchanger is a coil inside the condensation reservoir. 
     
     
         5 . The CO 2  refrigeration system according to  claim 1 , wherein the evaporation stage has a circuit of pipes arranged under the ice-playing surface, whereby the CO 2  refrigerant circulating in the circuit of pipes of the evaporation stage absorbs heat from the ice-playing surface. 
     
     
         6 . The CO 2  refrigeration system according to  claim 1 , wherein the evaporation stage has a heat exchanger for the heat exchange between the CO 2  refrigerant and another refrigerant circulating in a circuit of pipes arranged under the ice-playing surface, whereby the other refrigerant circulating in the circuit of pipes of the evaporation stage absorbs heat from the ice-playing surface.