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The simplest approach from a refrigeration system design perspective is to use a single evaporator coil.
July 1, 2017
A common domestic refrigerator consists of medium and low temperature sections. The challenge for the system designer is to find cost-effective solutions to properly control the temperature and humidity for both sections in an efficient manner.
Carbon dioxide found popularity as a refrigerant for comfort cooling in the 1920s, before being replaced by more convenient CFCs (chlorofluorocarbons) in the 1930s and then HFCs (hydroflurocarbons) in the 1990s. But with the Kyoto Protocol, an international treaty requiring industrialized nations to lower their collective greenhouse gases 5 percent below 1990 levels by 2012, carbon dioxide has come back into the limelight as a hope for a safe and effective refrigerant replacement.