What type of oil is used with HFC refrigerant?

The correct answer is polyol ester. When working with HFC (Hydrofluorocarbon) refrigerants, polyol ester oils are the recommended lubricant due to their chemical compatibility. HFC refrigerants are often used in applications that demand low environmental impact and high efficiency, and polyol ester oils provide superior performance in these systems.

Polyol esters have good thermal stability and low volatility, which ensures that the lubricant remains effective over time without breaking down. They are also hygroscopic, meaning they can absorb moisture, which can be beneficial in preventing acidity in the refrigerant system. Additionally, these oils have better solubility with HFC refrigerants compared to other oil types, enhancing the overall efficiency of the refrigeration system.

In contrast, mineral oils and alkylbenzene oils do not blend well with HFC refrigerants. Mineral oils are typically used with CFC and HCFC refrigerants and are not suitable for HFC systems. Alkylbenzene, while better than mineral oil, still does not perform as well as polyol esters in compatibility and thermal performance with HFCs. The option "Ab / min" seems not to be a standard term in this context, further emphasizing that polyol ester is the most appropriate