Patent ID: 6474087
Filing Date: 2002-11-05
Classification: F04C,F25B

Abstract:
An economized refrigeration or air conditioning system having:a closed fluid circuit serially including a compressor, a discharge line, a condenser, an economizer, a first expansion device, an evaporator, and a suction line leading back to said compressor; a branch line connected to said closed fluid circuit intermediate said condenser and said economizer; and serially including a second expansion device, said economizer, and expanding into said compressor; means for sensing operating conditions in said refrigeration system; means for controlling said refrigeration system responsive to sensed operating conditions; a variable restriction for controlling the rate of flow from said branch line into said compressor, said variable restriction variable in size in response to sets of said operating conditions; and said means for controlling said refrigeration system controlling said variable restriction for controlling the rate of flow from said branch line into said compressor.