WASHINGTON — Alternative refrigeration systems using natural refrigerants such as carbon dioxide (CO2) are within reach of supermarket retailers from a cost and implementation perspective, though challenges remain, said a panel of supermarket executives at ATMOsphere America 2012, a conference on the business case for natural refrigerants held here last week at the Liaison Capitol Hill Hotel. Natural refrigerants, such as ammonia, carbon dioxide (CO2), propane and other gases, have ...

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