Two-stage refrigeration cycle
Theory of refrigerating machines - Mechanical compression machines. Multistage cycles

Such a cycle develops between three pressure levels p _C > p _i > p _F to which correspond three refrigerant saturation temperature levels q _C > q _i > q _F (figure 2 ) where p _i and q _i are the intermediate saturation pressure and temperature respectively.

The low-pressure compressor compresses the refrigerant from p _F to p _i...