Patent ID: 7424807
Filing Date: 2008-09-16
Classification: F25B

Abstract:
1. A refrigeration system comprising: a compressor for compressing a refrigerant to a high pressure, said compressor including a suction port and an economizer port; a heat rejecting heat exchanger for cooling said refrigerant; an economizer heat exchanger, said refrigerant being split into a main passage and an economized passage, and said refrigerant in said economized passage is reduced to a low pressure in an economizer expansion device and exchanges heat with said refrigerant in said main passage in said economizer heat exchanger, said economized passage returning to said economizer port of said compressor along an economizer return line; an accumulator positioned between said economizer heat exchanger and said compressor for storing an amount of charge, and said accumulator is located on said economizer return line; a main expansion device for reducing said refrigerant in said main passage to a low pressure; a heat accepting heat exchanger for evaporating said refrigerant, and said refrigerant from said heat accepting heat exchanger enters said compressor through said suction port; and a control that monitors said high pressure in said system, wherein said control opens said economizer expansion device when said control detects that said high pressure in said system is above a desired high pressure to decrease said high pressure.