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AssigneeSanyo Electric Co., Ltd.
InventorsYutaka Hirano, Takeo Komatubara, Takashi Sunaga, Yasuki Takahashi, Kiyoshi Tanaka, Kiyoshi Akazawa, Masato Watanabe, Seiki Jikuhara
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A refrigerating unit having at least one refrigerating machine oil using polyol ester system oil as its base oil in at least one refrigeration cycle using at least one hydrofluorocarbon system refrigerant as a refrigerant, the present invention sets the purity of hydrofluorocarbon system refrigerant to the level higher than 99.95 wt % and the mixing of chlorine system refrigerant to the level lower than 80 ppm. In addition, the performance and reliability of refrigerating unit using the hydrofluorocarbon system refrigerant such as R134a can be enhanced by making the said polyol ester system oil to be the chemical compound of particular physical properties, by suppressing the equilibrium water content of refrigeration cycle and by limiting the residual chlorine volume.
A refrigerating unit using a hydrofluorocarbon system refrigerant in a refrigeration cycle and having at least one refrigerating machine oil with a polyol ester oil as its base oil, wherein said polyol ester oil is a chemical compound prepared by polymerizing without a catalyst at least one polyol having at least two functional groups with at least one alkyl fatty acid having a straight chain or a branched chain, the poly ester oil having a fluidity point lower than -40.degree. C., a two-liquid separation temperature lower than -20.degree. C., a total acid value lower than 0.02 mgKOH/g, a viscosity of 8 to 100 cst at 40.degree. C. and a viscosity index of at least 80, the hydrofluorocarbon system refrigerant having its purity higher than 99.95 wt % and the amount of chlorine impurity in the system refrigerant being lower than 80 ppm.
Dependencies are inferred from the claim text.