Patent ID: 9109816
Filing Date: 2015-08-18
Classification: F25B

Abstract:
1. A mechanical subcooling system for use with a transcritical R-744 refrigeration system having at least one compressor for compressing R-744 vapors directed to a cooler operatively connected to a first throttling device, for reducing the pressure and temperature of the R-744 vapors to a level required for the normal operation of the R-744 refrigeration system, through a first heat exchanger, the first heat exchanger being operatively connected to the at least one compressor to provide the R-744 vapors to the at least one first compressor and to receive compressed R-744 vapors from the at least one first compressor, a by-pass valve for maintaining a required flow of R-744 vapors through the first heat exchanger, and a first receiver for receiving the R-744 vapors from the first throttling device, the first receiver being operatively connected to at least one defrost compressor, the mechanical subcooling system comprising: a second heat exchanger operatively connected between the at least one first compressor and the cooler; a third heat exchanger and a second throttling device operatively connected between the first heat exchanger and a second receiver for the separation of R-744 vapors and liquid; a first pressure regulating valve for feeding R-744 vapors from the second receiver to the at least one first compressor; at least one second compressor for mechanically subcooling of R-744 vapors leaving the cooler through the third heat exchanger or for heat reclaim through the second heat exchanger; and a fourth heat exchanger operatively connected between the second receiver and the at least one second compressor.