Refrigeration apparatus

Abstract

The whole of a refrigerant circuit in which a refrigeration cycle is performed is accommodated in a casing. A heat medium circuit is provided, which is connected to the refrigerant circuit through a utilization-side heat exchanger, and which supplies a heat medium exchanging heat with refrigerant in the heat exchanger, to a predetermined heat utilization target. As the refrigerant of the refrigerant circuit, refrigerant which is represented by a molecular formula C 3 H m F n (note that “m” and “n” are integers equal to or greater than 1 and equal to or less than 5, and a relationship represented by an expression m+n=6 is satisfied), and which has a single double bond in a molecular structure, or refrigerant mixture containing such refrigerant is used.

1 . A refrigeration apparatus, comprising:
 a refrigerant circuit in which a compressor, a heat-source-side heat exchanger, an expansion mechanism, and a utilization-side heat exchanger are connected together, and a refrigeration cycle is performed by circulating refrigerant; and   a casing in which the whole of the refrigerant circuit is accommodated,   wherein refrigerant of the refrigerant circuit is refrigerant which is represented by a molecular formula C 3 H m F n  where “m” and “n” are integers equal to or greater than 1 and equal to or less than 5, and a relationship represented by an expression m+n=6 is satisfied, and which has a single double bond in a molecular structure, or refrigerant mixture containing the refrigerant.   
     
     
         2 . The refrigeration apparatus of  claim 1 , further comprising:
 a heat medium circuit which is connected to the refrigerant circuit through the utilization-side heat exchanger, and which supplies a heat medium exchanging heat with refrigerant in the utilization-side heat exchanger, to a predetermined heat utilization target.   
     
     
         3 . The refrigeration apparatus of  claim 2 , wherein
 the utilization-side heat exchanger serves as a heating heat exchanger for heating the heat medium of the heat medium circuit by the refrigerant of the refrigerant circuit.   
     
     
         4 . The refrigeration apparatus of  claim 3 , wherein
 the heat utilization target is a hot-water generator for generating hot water.   
     
     
         5 . The refrigeration apparatus of  claim 3 , wherein
 the heat utilization target is a floor heater for heating a floor surface.   
     
     
         6 . The refrigeration apparatus of  claim 2 , wherein
 the utilization-side heat exchanger serves as a cooling heat exchanger for cooling the heat medium of the heat medium circuit by the refrigerant of the refrigerant circuit.   
     
     
         7 . The refrigeration apparatus of  claim 6 , wherein
 the heat utilization target is a cooler for generating cold heat.   
     
     
         8 . The refrigeration apparatus of any one of  claims 2  to  7 , wherein
 the heat medium circuit circulates water which is a heat medium. 
 
     
     
         9 . The refrigeration apparatus of any one of  claims 1  to  7 , wherein
 the refrigerant which is represented by the molecular formula C 3 H m F n  where “m” and “n” are integers equal to or greater than 1 and equal to or less than 5, and the relationship represented by the expression m+n=6 is satisfied, and which has the single double bond in the molecular structure is 2,3,3,3-tetrafluoro-1-propene. 
 
     
     
         10 . The refrigeration apparatus of  claim 9 , wherein
 the refrigerant of the refrigerant circuit is refrigerant mixture further containing difluoromethane.   
     
     
         11 . The refrigeration apparatus of  claim 10 , wherein
 the refrigerant of the refrigerant circuit is refrigerant mixture further containing pentafluoroethane.