Patent ID: 6258293
Filing Date: 2001-07-10
Classification: C09K,C10M,C10N,F04C,F25B,Y10S

Abstract:
A refrigeration cycle comprising at least a compressor, a condenser, an expansion mechanism, and an evaporator, a refrigerant in said cycle composed of a hydrofluorocarbon refrigerant containing no chlorine atoms and having a critical temperature of 40.degree. C. or higher, and a refrigerating machine oil comprising as base oil a hindered ester oil of one or more fatty acids wherein the ester oil contains at least two ester linkages ##STR15##in the molecule, said refrigerating machine oil dissolving the refrigerant therein having an actual viscosity of 1.0 to 4.0 cSt when measured at a gas pressure of 9 to 11 kg/cm.sup.2 abs and an oil temperature of 100.degree. C., said compressor being a high-pressure closed vessel.