Lubricant for Low Global Warming Potential Refrigerant Systems

A refrigeration system, comprising a compressor and a working fluid, wherein the working fluid comprises:

• a lubricating oil component comprising (i) 80 mol % to 90 mol % of a polyolester oil, wherein the polyolester oil comprises 10 mol % to 20 mol % dipentareythritol, 0 mol % to 10 mol % of a linear carboxylic acid having 5 carbon atoms, 3 mol % to 10 mol % of a linear carboxylic acid having 7 carbon atoms, 10 mol % to 20 mol % of a linear carboxylic acid having 8 carbon atoms, 40 mol % to 70 mol % of a branched carboxylic acid having 9 carbon atoms, and 5 mol % to 12mol % of a linear carboxylic acid having 10 carbon atoms, and (ii) 10% by weight to 20% by weight of an alkylbenzene.

A method of lubricating a compressor comprising supplying to the compressor a working fluid comprising:

• (a) a lubricating oil component comprising (i) a polyolester oil, wherein the polyolester oil comprises dipentaerythritol esterified with a mixture of carboxylic acids, wherein the mixture of carboxylic acids comprises at least one linear carboxylic acid having 8 to 10 carbon atoms and (ii) an alkylbenzene;
• and
• (b) a refrigerant comprising hydrofluroolefin-1336mzzZ/trans-1,2-dichloroethylene.