Experimental study and analysis of R290 automotive air conditioning compressor performance

To investigate the application performance of the environmentally friendly refrigerant R290 in automotive air conditioning systems, this paper constructs a performance test system for the R290 automotive air conditioning compressor and studies the change trend of compressor performance parameters under different compressor speeds, evaporating temperatures and condensing temperatures. The results show that the compressor discharge temperature decreases with the increase of the compressor speed. The oil circulation rate, cooling capacity, refrigerant mass flow rate, and compressor power increase with the increase of the compressor speed. The isentropic efficiency and COP first increase and then decrease with the increase of the compressor speed. The volumetric efficiency increases with the increase of the compressor speed or decreases after reaching a peak value. At the same speed, the discharge temperature is negatively correlated with the evaporating temperature, but positively correlated with the condensing temperature.The oil circulation rate, cooling capacity, COP, volumetric efficiency, and isentropic efficiency are positively correlated with the evaporating temperature and negatively correlated with the condensing temperature. The refrigerant mass flow rate is positively correlated with the evaporating temperature, and changing the condensing temperature has little effect on the refrigerant mass flow rate. When the condensing temperature is 45 ℃ and the evaporating temperature increases from 0 ℃ to 10 ℃, the maximum cooling capacity, COP, volumetric efficiency, and isentropic efficiency reach 13.98 kW, 5.74, 94.79% and 81.48%, respectively. The compressor power is almost unaffected by the evaporating temperature, but is positively correlated with the condensing temperature.