Study on the relationship between the heat performance of EV and its compressor speed
In this paper,simulation methods were used to explore the influence of different compressor speed control meth-ods on system performance and energy consumption of elctric vehicle(EV).Under the condition of the vehicle heat load of 2 000 W,the temperature of the cabin is reduced from 65 ℃ to 25 ℃,different initial compressor speed corresponds to different energy efficiency in the cooling stage from the perspective of energy consumption.The highest efficiency is 2.48 for 4 000 rpm.As the compressor speed increases or decreases,the system energy efficiency decreases continuously.Compared to compressor speed 8 000 rpm,4 000 rpm has an average energy consumption of 122 W lower over 1 000 s.In the same working conditions,different speed control methods will have different impacts on energy efficiency.The results show that improving compressor energy effi-ciency and reducing compressor power will inevitably extend the time to reach the target temperature of the cabin.Compared with the control by means of increasing or decreasing the compressor speed,the compressor operation in the best speed range has a better energy consumption,the energy saving effect is 2.75 times higher,and the cooling rate is increased by 97 s.
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