This paper presents an experimental study of lubricant effect on the performance of microchannel evaporators in a typical MAC system. R134a is used as the refrigerant with PAG46 lubricant. The increase of oil circulation rate elevates the pressure drop of the evaporator. The specific enthalpy change in evaporator decreases with increasing oil circulation rate, while refrigerant distribution appears to be more uniform as indicated by infrared images of the evaporator surface temperatures. Thus mass flow rate increases.
Lubricant Effect on Performance of R134a MAC Microchannel Evaporators
Sae Technical Papers
SAE 2014 World Congress & Exhibition ; 2014
2014-04-01
Conference paper
English
Lubricant Impact on R134a Distribution and Microchannel Heat Exchanger Performance
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