Patent ID: 6644045
Filing Date: 2003-11-11
Classification: F01C,F04C,F25B

Abstract:
A closed refrigeration system containing refrigerant and serially including a main compressor, a discharge line, a condenser, an expressor, an evaporator and a suction line wherein:said expressor includes a screw expander having a pair of rotors each having a pair of ends and a screw compressor having a pair of rotors each having a pair of ends with each rotor of said screw expander having a common shaft with a corresponding one of said rotors of said screw compressor; said screw expander and said screw compressor each having an inlet port and an outlet port with said outlet port of said screw expander and said inlet port of said screw compressor being located at first opposing ends of said rotors of said screw expander and said screw compressor respectively; said outlet port of said screw expander connected to said evaporator; means for supplying refrigerant vapor at evaporator pressure to said inlet port of said screw compressor; said inlet port of said screw expander and said outlet port of said screw compressor being located at second opposing ends of said rotors of said screw expander and said screw compressor, respectively; said inlet port of said screw expander is connected to said condenser; said outlet port of said screw compressor is connected to said discharge line.