Refrigeration device

Abstract

An object is to provide a novel multi-stage refrigeration apparatus. The object is achieved by a refrigeration apparatus comprising a user-side heat transfer cycle that includes a user-side compressor, a user-side heat exchanger, a user-side pressure-reducing device, and a user-side cascade heat exchanger, and that circulates a user-side refrigerant; a heat-source-side heat transfer cycle that includes a heat-source-side compressor, a heat-source-side heat exchanger, a heat-source-side pressure-reducing device, and a heat-source-side cascade heat exchanger, and that circulates a heat-source-side refrigerant; a cascade heat exchanger configured to exchange heat between the user-side refrigerant of a user-side condenser and the heat-source-side refrigerant of a heat-source-side evaporator; and a control device, the user-side refrigerant having a boiling point of -30° C. or more and 25° C. or less, and the heat-source-side refrigerant having a boiling point of -55° C. or more and less than -30° C.

1 - 12 . (canceled) 
     
     
         13 . A refrigeration apparatus comprising:
 a user-side heat transfer cycle configured to circulate a user-side refrigerant;   a heat-source-side heat transfer cycle configured to circulate a heat-source-side refrigerant; and   a cascade heat exchanger configured to exchange heat between the user-side refrigerant and the heat-source-side refrigerant,   wherein the heat-source-side refrigerant comprises HFO-1123 and/or HFO-1132, and the user-side refrigerant is at least one member selected from the group consisting of R513A, R515A, R515B, R471A, R1224, R1234yf, R1234ze, R1233, and R1336mcy.   
     
     
         14 . A refrigeration apparatus comprising:
 a user-side heat transfer cycle configured to circulate a user-side refrigerant;   a heat-source-side heat transfer cycle configured to circulate a heat-source-side refrigerant; and   a cascade heat exchanger configured to exchange heat between the user-side refrigerant and the heat-source-side refrigerant,   wherein the heat-source-side refrigerant is R452B or R454B, and the user-side refrigerant is at least one member selected from the group consisting of R513A, R515A, R515B, R1224, R1234yf, R1234ze, R1233, and R1336.   
     
     
         15 . The refrigeration apparatus according to  claim 13 , wherein the heat-source-side heat transfer cycle is a vapor compression refrigeration cycle comprising a heat-source-side compressor, a heat-source-side heat exchanger, a heat-source-side pressure-reducing device, and a heat-source-side cascade heat exchanger. 
     
     
         16 . The refrigeration apparatus according to  claim 13 , wherein the user-side heat transfer cycle is a vapor compression refrigeration cycle comprising a user-side compressor, a user-side heat exchanger, a user-side pressure-reducing device, and a user-side cascade heat exchanger. 
     
     
         17 . The refrigeration apparatus according to  claim 13 , wherein the user-side heat transfer cycle is a heat transfer cycle comprising a pump, a user-side heat exchanger, and a user-side cascade heat exchanger. 
     
     
         18 . The refrigeration apparatus according to  claim 13 , wherein flow directions of the heat-source-side refrigerant and the user-side refrigerant are in countercurrent flow in the cascade heat exchanger. 
     
     
         19 . The refrigeration apparatus according to  claim 13 , wherein the heat-source-side refrigerant has a burning velocity of 10 cm/s or less, and the user-side refrigerant has a burning velocity of 3 cm/s or less. 
     
     
         20 . The refrigeration apparatus according to  claim 13 , wherein the heat-source-side refrigerant is classified as Class 2L by ASHRAE, and the user-side refrigerant is classified as Class A1 by ASHRAE. 
     
     
         21 . The refrigeration apparatus according to  claim 13 , which is an air-conditioning system, a refrigerator, a freezer, a water cooler, an ice maker, a refrigerated showcase, a freezing showcase, a freezing and refrigerating unit, a refrigerating machine for freezing and refrigerating warehouses, an air-conditioning system for vehicles, a turbo refrigerating machine, or a screw refrigerating machine. 
     
     
         22 . The refrigeration apparatus according to  claim 13 , which is a household air-conditioning system, an air-conditioning system for business use, an industrial air-conditioning system, or a multi-split air-conditioning system for buildings.