Flash tank pressure control for transcritical system with ejector(s)

Abstract

In certain embodiments, a transcritical refrigeration system provides refrigeration by circulating carbon dioxide (CO) refrigerant through the system. A flash tank of the transcritical refrigeration system is operable to supply the COrefrigerant, in liquid form, to a low temperature refrigeration case and a medium temperature refrigeration case. A low temperature compressor is operable to compress the COrefrigerant discharged from the low temperature refrigeration case. A medium temperature compressor, a parallel compressor, and an ejector are each operable to compress the COrefrigerant discharged from the medium temperature refrigeration case, the COrefrigerant discharged from the low temperature compressor, and/or COflash gas discharged from the flash tank. A gas cooler is operable to cool the COrefrigerant discharged from the medium temperature compressor and the parallel compressor. A controller is operable to dynamically adjust a pressure set point for the flash tank.