Oil Effects On Performance Of Automobile A/C System

This paper presents the effect of lubricant on automotive A/C system based on a series experiments in a real MAC system at two SAE conditions. The lubricant effect on heat transfer, pressure drop, refrigerant distribution, available enthalpy difference across evaporator, mass flow rate, capacity, compressor work and system COP are investigated and presented. It is found that the system capacity decreases with increase of OCR, but COP achieves a highest value when OCR is around 2-3% for constant compressor speed (capacity drops).Â