Patent ID: 6591618
Filing Date: 2003-07-15
Classification: F25B

Abstract:
A method for providing refrigeration to a refrigeration load comprising:(A) providing warm temperature supercritical pressure refrigerant fluid and compressing the warm temperature supercritical pressure refrigerant fluid to be at a higher supercritical pressure; (B) cooling the higher supercritical pressure refrigerant fluid and expanding the cooled higher supercritical pressure refrigerant fluid to produce cold temperature supercritical pressure refrigerant fluid; and (C) warming the cold temperature supercritical pressure refrigerant fluid by indirect heat exchange with said cooling higher supercritical pressure refrigerant fluid and by indirect heat exchange with a refrigeration load to produce said warm temperature supercritical pressure refrigerant fluid, wherein the refrigerant fluid comprises carbon dioxide and the cold temperature is less than the critical temperature of the refrigerant fluid.