Performance Analysis And Experimental Study Of Electric Vehicle Air-conditioning System

With the advantages of high efficiency and pollution-free, fuel cellvehicle is an ideal future vehicles development direction. However, nearly62%of its heat should be distributed by front cabin radiators. As the spaceof front cabin is limited, the condenser of air conditioning system, the fuelcell system radiator and the power control unit radiator are integrated as acooling module. The performance of air conditioning not only affects thepassenger comfort, but also affects the heat dissipation performance offront cabin. The thesis mainly focuses on the following contents:In the first place, the heat load calculation model of fuel cell vehiclewas set up, thus the refrigerating capacity in summer operating conditionwas obtained.Secondly, established theoretical models of components in electricvehicle air-conditioning system, including R134a rapid calculation model,scroll compressor performance correlations which are based on thecompressor experimental research, the steady-state distributed parametermodels of parallel flow evaporator and condenser and the expansion valvesimulation model. Analyzed the impact of environmental temperature, inletair velocity and compressor speed on air conditioning system performance.Thirdly, made experimental research of air conditioning system.Analyzed the performance influence of inlet air velocity, inlet airtemperature and refrigerant flow rate on parallel flow condenser. The flattube structure parameters which affect performance of parallel flowcondenser, such as inner hole number, inner hole depth-width ratio, flowpaths number and flat tubes distribution of different flow path were alsodiscussed in details.