As retailers seek alternatives to ozone-depleting refrigerant R-22 and global-warming HFC refrigerants for their commercial refrigeration systems, one environmentally benign alternative is carbon dioxide. CO2 (R-744) requires the installation of an entirely new refrigeration system, such as secondary loop or cascade models. These systems, which have been tried by a handful of U.S. retailers, still use some conventional refrigerant, and may not be as energy efficient as conventional ...

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