Abstract
Hydro fluoro olefin (HFO) and hydro carbon (HC) refrigerants have been considered for use in air-conditioning systems and refrigerators as low global warming potential (GWP) refrigerants. These refrigerants are determined the lubrication performance of the sliding parts in compressor. To clarify lubrication performance of unsaturated and saturated refrigerants for these low GWP refrigerants, seizure and wear tests were done in the compound of liquid refrigerant and refrigeration oil. Immiscible oils to refrigerants were used for lubrication. We confirmed that antiwear and antiseizure characteristics of unsaturated refrigerants (HFO-1234yf and R1270) are better than those of saturated refrigerants HFC-134a and R290.
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