With the approach of 2010, the industry will be faced with a shift in both refrigerants and system lubricants. The impending phaseout of chlorine-based refrigerants mandates that the industry move to lubricants that work satisfactorily with the new hydrofluorocarbon (HFC) refrigerants.
This is the first in a series of advanced basic articles on the refrigeration cycle. All of these articles deal with refrigerant pressures, states, and conditions as applied to a refrigeration system with a refrigerant like R-134a that is not a blend.
This fourth of a series of articles on CO2, after a brief review of CO2 characteristics, comparing subcritical and transcritical cycles, presents a functioning transcritical system with a hermetic CO2 compressor and discusses design considerations.
Many times technicians will have the tendency to overcharge refrigeration systems. Many symptoms for other system problems look similar, but they are not exactly like an overcharge of refrigerant.
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