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A method of improving performance of refrigerant systems such as refrigerators and air conditioners that utilize a refrigerant working fluid. The working fluid consists essentially of a heat transfer fluid and a lubricant that is miscible and is otherwise compatible with the heat transfer fluid at a

A method of improving performance of refrigerant systems such as refrigerators and air conditioners that utilize a refrigerant working fluid. The working fluid consists essentially of a heat transfer fluid and a lubricant that is miscible and is otherwise compatible with the heat transfer fluid at all operating temperatures of the refrigerant system. The method is directed particularly to chlorine-free fluoro-group organic fluids and more particularly to hydrofluorocarbon heat transfer fluids. The preferred lubricants comprise polyol ester basestocks and compounded polyol esters that are highly miscible with such hydrofluorocarbon heat transfer fluids.

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What is claimed is: 1. A process of improving by at least 2.5% the coefficient of performance of a refrigerant system utilizing a working fluid and comprising a compressor, a condenser, an expansion device and an evaporator, the process comprising employing in the system a working fluid consisting

What is claimed is: 1. A process of improving by at least 2.5% the coefficient of performance of a refrigerant system utilizing a working fluid and comprising a compressor, a condenser, an expansion device and an evaporator, the process comprising employing in the system a working fluid consisting essentially of esters of alcohols consisting essentially of pentaerythritol and di-pentaerythritol and carboxylic acids consisting essentially of a mixture of nC5, nC6, nC7 and nC8 acids and including at least one additive selected from the group consisting of oxidation resistance and thermal stability improvers, corrosion inhibitors, metal deactivators, lubricity additives, viscosity index improvers, pour and/or floc point depressants, detergents, dispersants, foam promoting agents, anti-foaming agents, anti-wear and extreme pressure resistance agents and acid scavengers, and that is miscible with the heat transfer fluid over the entire operating conditions of the system compared with a mineral oil lubricant that is not miscible over the operating conditions of the system. 2. A process according to claim 1, wherein the chlorine-free fluoro-group organic heat transfer fluid is 1,1,1,2-tetrafluoroethane. 3. A process of improving by at least 2.5% the coefficient of performance of a refrigerant system utilizing a working fluid and comprising a compressor, a condenser, an expansion device and an evaporator, the process comprising employing in the system a working fluid consisting essentially of a chlorine-free fluoro-group organic heat transfer fluid and a lubricant composition consisting essentially of esters of alcohols consisting essentially of pentaerythritol and di-pentaerythritol and carboxylic acids, consisting essentially of a mixture of nC5, nC6, nC7 and nC8 acids and additives comprising at least one antiwear and extreme pressure resistance agent and that is miscible with a heat transfer fluid over the entire operating conditions of the system, compared with a mineral oil lubricant that is not miscible with the heat transfer fluid over the operating conditions of the system. 4. A process of improving by at least 2.5% the coefficient of performance of a refrigerant system utilizing a working fluid and comprising a compressor, a condenser, an expansion device and an evaporator, the process comprising employing in the system a working fluid consisting essentially of a chlorine-free fluoro-group organic heat transfer fluid and a lubricant composition consisting essentially of esters of alcohols consisting essentially of pentaerythritol and di-pentaerythritol and carboxylic acids consisting essentially of a mixture of 53-63% nC5, 5-15% nC6, 7-17% nC7, 7-17% nC8, 0-10% nC9 and 0-10% nC10 acids, including at least one additive selected from the group consisting of oxidation resistance and thermal stability improvers, corrosion inhibitors metal deactivators, lubricity additives, viscosity index improvers, pour and/or floc point depressants, detergents, dispersants, foam promoting agents, anti-foaming agents, anti-wear and extreme pressure resistance agents and acid scavengers, and that is miscible with the heat transfer fluid over the entire operating conditions of the system compared with a mineral oil lubricant that is not miscible with the heat transfer fluid over the operating conditions of the system. 5. A process according to claim 4, wherein the chlorine-free fluoro-group organic heat transfer fluid is 1,1,1,2-tetrafluoroethane. 6. A process of improving by at least 2.5% the coefficient of performance of a refrigerant system utilizing a working fluid and comprising a compressor, a condenser, an expansion device and an evaporator, the process comprising employing in the system a working fluid consisting essentially of a chlorine-free fluoro-group organic heat transfer fluid and a lubricant composition consisting essentially of esters of alcohols consisting essentially of pentaerythritol and di-pentaerythritol and carboxylic acids comprising consisting essentially of a mixture 53-63% nC5, 5-15% nC6, 7-17% nC7, 7-17% nC8, 0-10% nC9 and 0-10% nC10 acids and at least one antiwear and extreme pressure resistance agent selected from the group consisting of sulfurized fatty acids and fatty acid esters, such as sulfurized octyl tallate; sulfurized terpenes; sulfurized olefins; organopolysulfides; organo phosphorus derivatives including amine phosphates, alkyl acid phosphates, dialkyl phosphates, aminedithiophosphates, trialkyl and triaryl phosphorothionates, trialkyl and triaryl phosphines, and dialkylphosphites, amine salts of phosphoric acid monohexyl ester, amine salts of dinonylnaphthalene sulfonate, triphenyl phosphate, trinaphthyl phosphate, diphenyl cresyl and dicresyl phenyl phosphates, naphthyl diphenyl phosphate, triphenylphosphorothionate, dithiocarbamates, such as an antimony dialkyl tithiocarbamate; chlorinated and/or fluorinated hydrocarbons, and xanthates and that is miscible with the heat transfer fluid over the entire operating conditions of the system compared with a mineral oil lubricant that is not miscible with the heat transfer fluid over the operating conditions of the system.