Differential solubilisation of HFC blends in POE oils and influence on systems performance

摘要

HFC blends are now accepted worldwide by the refrigeration and A/C market to replace CFCs and HCFCs. They are mostly composed by two or three refrigerants, each of them having a different behaviour with lubricants in terms of solubility.Consequently, a test procedure has been developed to determine the solubility curves for refrigerant and oil mixtures as well as the differential solubilisation of blend components in lubricants. It is important to evaluate their behaviour sincedifferential solubility may lead to a composition shift in the system.This paper intends to show that there is no impact of composition shift on systems performance with R-22 substitutes.