Method of operating a multi-stage refrigeration system with pressure control

摘要

A multi-stage refrigeration system is provided. The refrigeration system includes a first compression element (101) which produces a first compressed refrigerant stream. A mixer combines the first compressed refrigerant stream with an auxiliary refrigerant stream. A second compression element (104) is coupled to the mixer and produces a second compressed refrigerant stream. A first heat exchanger (105) receives the second compressed refrigerant stream and generates a cooled stream. A stream splitter (110) receives the cooled stream and provides first and second output streams. A first expansion valve (106) receives the first output stream and controls the flow of the first output stream and a second expansion valve (109) receives the second output stream and controls the flow of the second output stream. A second heat exchanger (107) generates the auxiliary refrigerant stream provided to the mixer. An evaporator (108) is coupled to the first expansion valve (106) and the first compression element (101) to evaporate the first output stream and provide an evaporated stream to the first compression element (101).