Patent ID: 7647790
Filing Date: 2010-01-19
Classification: F04C,F25B

Abstract:
1. A refrigeration system comprising: a compressor having a suction port, a discharge port, and at least one passageway communicating with at least one intermediate-pressure location of said compressor and through which a fluid can be injected into said intermediate-pressure location, said compressor compressing a refrigerant and a cooling liquid flowing therethrough to a discharge pressure greater than a suction pressure, said cooling liquid is a single-phase lubricant that absorbs heat within said compressor caused by compression of said refrigerant and said cooling liquid; a separator separating said refrigerant and said cooling liquid; a first flow path communicating with said separator and said passageway and through which a first stream of refrigerant from said separator flows and is injected into said intermediate-pressure location of said compressor, said first stream being predominantly refrigerant vapor when injected into said intermediate-pressure location; a second flow path communicating with said separator and said passageway and through which a second stream of refrigerant flows and is injected into said intermediate-pressure location of said compressor, said second stream being predominately liquid refrigerant when injected into said intermediate-pressure location; and a third flow path from said separator to said passageway and through which a third stream of predominantly cooling liquid from said separator flows and is injected into said intermediate-pressure location of said compressor.