Development of testing system for electronic expansion valve of R1234yf air conditioning of new energy vehicle
In view of the problems of the current domestic electronic expansion valve testing systems,such as large deviation,small testing range,and high energy consumption,a new electronic expansion valve testing system for R1234yf new energy vehicle air conditioning was developed.The testing system utilizes refrigerant throttling to pressurize the gas phase through the compressor,and pressurize the liquid phase through a fluorine pump.The two phases were fully mixed before entering the condenser.The exhaust throttle valve was used to directly control the pressure behind the tested electronic expansion valve.Feasibility and thermal performance analysis of the testing system was conducted based on the national standard for automotive thermal management,and compared with the actual refrigeration method and the liquid ring method to test the condensation heat load and total power consumption of the system.The results show that the system utilizes the two-phase loop method to reduce the condensation heat after condensation,controls the pressure behind the measured valve through the exhaust throttle valve,cancels the evaporator,and improves system performance;Under the working fluid mass flow rate of 0.02～0.18 kg/s flowing through the tested electronic expansion valve,the condensation heat load of the system is reduced by 71.6%compared to the actual refrigeration method,37.9%compared to the liquid ring method,and the total power consumption is reduced by 63.7%～38.6%compared to the actual refrigeration method,but it is increased by 7.5%compared to the liquid ring method.This system can provide a feasible and energy-saving testing method for the performance testing of electronic expansion valves in the new energy vehicle air conditioning industry.
air conditioning system for new energy vehicleR1234yf refrigerantelectronic expansion valvetwo-phase loop methodperformance analysis
国家科技期刊平台
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