| In this paper,the ejector efficiency heat pump air conditioning system for electric vehicle is designed and built by the research group improved.The interior and exterior heat exchangers are designed to be separated from the front and rear rows,and ejectors are added,and micro-regulating valves are used instead of capillaries.To more precisely control the pressure of the front and rear rows of the evaporator,so as to form a cascade evaporation recovery expansion work,thereby improving system performance.The simulation model of the ejector efficiency heat pump air conditioning system for electric vehicle is optimized and simulated.The experiment is carried out on the improved system performance test bench.The impact of external temperature on system performance compared with that of the traditional heat pump air conditioning system,and finally compared the simulation results with the experimental results,the conclusion is drawn:(1)The simulation results indicate that when the compressor speed is 2700 rpm,the heating power consumption,heating capacity and heating COP increase by 12.77% with the temperature inside the vehicle(18-26°C),decrease by 14.14% and 23.86%,and increase by14.14% and 23.86% with the temperature outside the vehicle(-11 ～-3℃),decreased by30.00%,31.58% and 2.26%;at 3200 rpm,they were increased by 26.64%(18～26℃),decreased by 13.08% and 31.37%,and then(-11～-3℃)decreased 27.87%,32.07% and5.81%.(2)The simulation results indicate that at 2700 rpm,the cooling power consumption,cooling capacity and cooling COP increase by 12.99%,59.65% and 41.30% with the temperature inside the vehicle(13～25℃),and increase by 14.36% with the temperature outside the vehicle(40～52℃),decreased by 8.25% and 19.77%;at 3200 rpm,they were increased by 10.18%,52.41% and 38.33%(13～25°C),and then(40～52°C)increased by13.78%,decreased by 15.14% and 25.42%.(3)The simulation results indicate that compared with the ejector heat pump air conditioning system with a temperature difference of 7°C between the front and rear exhaust,the heating COP of the system at 5°C affected by the temperature inside the vehicle increases by about 15.34%～38.05%,and the cooling COP increases by about 2.08%～10.05%.Affected by the outside temperature at 5°C,the heating COP of the system increases by about5.07%～28.47%,and the cooling COP increases by about 5.09%～10.48%.(4)The experimental results indicate that at 2700 rpm,the power consumption,heating capacity and heating COP increase by 15.82% with the temperature inside the vehicle(18～26°C),decrease by 12.09% and 24.10%,and increase with the temperature outside the vehicle(-11～-3°C).Decreased by 12.34%,38.78% and 30.16%;at 3200 rpm,the they will increase by 19.87%(18～26°C),decrease by 19.41% and 32.77%,and then(-11～-3°C)decrease by 19.23%,27.23% vs.9.91%.(5)The experimental results indicate that at 2700 rpm,the cooling power consumption,cooling capacity and cooling COP increase by 26.09%,69.13% and 34.13% with the temperature inside the vehicle(13～25℃),and increase by 7.92% with the temperature outside the vehicle(40～52℃),decreased by 9.66% and 16.29%;at 3200 rpm,the three(13～25°C)increased by 15.12%,51.82% and 31.88%,and then(40～52°C)increased by13.46%,decreased by 17.24% and 27.06%.(6)The experimental results indicate that compared with the ejector heat pump air conditioning system with a temperature difference of 7°C between the front and rear exhaust,the heating COP of the system at 5°C affected by the temperature inside the vehicle increases by about 42.20%～69.62%,and the cooling COP increases by about 30.57%～49.89%.Affected by the outside temperature at 5°C,the heating COP of the system increases by about50.52%～65.82%,and the cooling COP increases by about 44.28%～69.30%. |
PDF Full Text Request