HFC/POE Lubricity Evaluation on the Rotary Compressor in System Operation

Abstract

As R22 alternative refrigerant/ oils, R407C/POE (polyolester ) and R410A/POE lubricating conditions on the rotary compressor journal bearings are evaluated, using electrical detection for the contact at sliding parts, in comparison with R22/MO(m ineral oil) as the current refrigerant/ oil.The evaluation is made with the 0. 75kW class 2-cylinder rotary compressor , mounted in a split type inverter driven heat pump system, and under system operation simulating the heat pump system in actual use.The results are: The R407CNG6 8POE's lubricating condition on the bearings is a little better than that for the current R22!MO's condition, the R407CNG3 2POE's condition is roughly at the same level as for the current R22/MO's.The R410.A/VG6 8POE's lubricating condition on the bearings is better than that for the current R22/MO's condition, the R410.A/VG 32POE's condition is roughly at the same level as for the current R22/MO's.