Patent ID: 6966193
Filing Date: 2005-11-22
Classification: F24F,F25B

Abstract:
1. A refrigerant cycle comprising at least two circuits, with each of said circuits having a compressor, a first heat exchanger and a second heat exchanger with an intermediate expansion device, and an economized cycle intermediate one of said first and second heat exchangers and said main expansion device, a line leading from said one of said first and second heat exchangers to an economizer heat exchanger having a tap that taps off a portion of a refrigerant flow in said line, with the main portion of refrigerant flow in said line passing through said economizer heat exchanger, and said portion in said tap passing through an economizer expansion device, and passing from said economizer expansion device into said economizer heat exchanger; said main portion of refrigerant flowing from said first heat exchanger, through said economizer heat exchanger, to said main expansion device, and then to the other of said first and second heat exchangers, and from there back to said compressor; and a control for controlling operation of said at least two circuits, said control being operable to turn off or turn on each of said economizer cycles, and to stop or run each of said compressors to achieve a desired system condition.