Vapor compression refrigeration system

Abstract

A vapor compression refrigeration system includes a subcooler provided between a condenser and an evaporator, which is formed by a heat exchanger integrally having a primary side and a secondary side into which a refrigerant which has passed through the primary side flows and in which the primary side and the secondary side have the same heat transfer area and capacity. An expansion valve is provided at a refrigerant entrance on the secondary side of the subcooler, and a primary expansion valve is provided at a refrigerant entrance on the primary side of the subcooler to which the refrigerant is introduced in a vapor compression refrigeration cycle having stages of compression, condensation, expansion and evaporation of the refrigerant. A bypass is provided in the primary expansion valve at the refrigerant entrance on the primary side.

What is claimed is: 
     
         1 . A vapor compression refrigeration system comprising a subcooler incorporated between a condenser and an evaporator, which is formed by a heat exchanger integrally having a primary side and a secondary side into which a refrigerant which has passed through the primary side flows and in which the primary side and the secondary side have the same heat transfer area and capacity, an expansion valve provided at a refrigerant entrance on the secondary side of the subcooler, and a primary expansion valve also provided at a refrigerant entrance on the primary side of the subcooler to which the refrigerant is introduced in a vapor compression refrigeration cycle having stages of compression, condensation, expansion and evaporation of the refrigerant, the system including;
 a bypass in the primary expansion valve at the refrigerant entrance on the primary side.   
     
     
         2 . The vapor compression refrigeration system according to  claim 1 ,
 wherein a rotating-permanent magnet induction heater (magnet heater) is interposed between an evaporator to which the refrigerant is introduced from a refrigerant exit on the secondary side of the subcooler and a compressor to which the refrigerant is returned.   
     
     
         3 . The vapor compression refrigeration system according to  claim 1 ,
 wherein, in the subcooler, the primary side is a supercooled liquid generating unit and the secondary side is a low-temperature unit for cooling the primary side, and   a temperature of the refrigerant which has passed through the secondary side is lower than a temperature of the refrigerant which has passed through the primary side.   
     
     
         4 . The vapor compression refrigeration system according to  claim 1 ,
 wherein the subcooler has a structure in which an outer surface thereof is covered by a heat insulating material to prevent heat releasing and heat absorbing.   
     
     
         5 . The vapor compression refrigeration system according to  claim 4 ,
 wherein cellular material-type urethane foam is used as the heat insulating material.   
     
     
         6 . The vapor compression refrigeration system according to  claim 1 ,
 wherein a refrigerant circuit incorporating the two subcoolers is formed for cooling and refrigerating as well as heating and defrosting.