Experimental Study on Performance of CO2 Heat Pump System for Electric Vehicles
In the present study,the CO2 heat pump system suitable for trans-critical areas is proposed using CO2 as the natural working medium. It is verified that the CO2 heat pump system of the foot outlet temperature and the foot temperature meets the vehicle technical specification reference standard under different low-temperature environments (-15 ℃,-23 ℃),and the temperature difference fluctuation is small. When the ambient temperature is low,the maximum heating performance is relatively good,and the average foot outlet temperature increases by about 2.96％. Afterwards,compared with the traditional refrigerant R134a heat pump system,it is found that the CO2 heat pump system has a relatively strong heating capacity and is more energy-saving,with an average energy consumption reduction of about 35.4％. At the same time,compared to the sum of the average power of the compressor and the positive temperature coefficient of the R134a heat pump system,the CO2 heat pump system compressor's average power is reduced by about 28.6％.
Electric vehicleHeat pump air conditioningCO2 refrigerantPerformance of the system
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