Which type of refrigerant requires POE oil for optimal performance?

Refrigerants categorized as HFCs (Hydrofluorocarbons) require POE (Polyol Ester) oil for optimal performance due to their chemical properties and compatibility requirements. HFCs do not mix well with mineral oils, which were traditionally used with CFCs and HCFCs. Therefore, POE oil, which is hygroscopic and has excellent lubricating properties, is utilized in systems using HFC refrigerants to ensure proper lubrication of the compressor and efficient overall operation.

In contrast, other types of refrigerants like HCFCs and CFCs are designed to work effectively with mineral oils, and using POE oil with them could lead to lubrication issues. HFOs, while they may also require POE in some applications, are typically seen as newer alternatives and do not universally mandate POE for performance as compared to HFCs. Understanding these relationships between refrigerants and oils is critical for maintaining system efficiency and longevity.