补气型纯电动客车热泵空调系统制冷性能研究

Study on refrigeration performance of air-entrained pure electric bus heat pump air conditioning system

为了研究低压补气模式对纯电动客车热泵空调系统制冷性能的影响,通过搭建一个带低压补气的热泵型电动客车空调系统试验台,分析对比了采用低压补气模式和不补气模式的纯电动客车热泵空调系统在不同压缩机转速下的制冷性能。结果表明:在采用低压补气和不补气两种模式下,系统制冷量、压缩机功率都随着压缩机转速的增大而变大,且在不同转速下采用低压补气模式,系统制冷量、压缩机功率均比不补气模式大;采用低压补气模式可以有效地降低系统的排气温度,增大系统的COP和EER,系统的稳定性也有了很大的提高。由以上结果可知,当系统排气温度较大时,可以打开低压补气模式,提高系统的稳定性。

In order to study the effect of the low-pressure air supply mode on the refrigeration performance of the pure electric passenger car heat pump air-conditioning system,a set of heat pump-type electric bus air-conditioning system test bench with low-pressure air supply was built,and the low-pressure air supply mode was adopted and analyzed.The effect of the heat pump system in the air supply mode on the refrigeration performance of the pure electric passenger car heat pump air conditioning system at different compressor speeds is as follows:in the low pressure air supply mode and the non-compensation mode,the system cooling capacity and the power of the compressor become larger as the compressor speed increases,and the system cooling capacity and compressor power are larger than the non-compensation mode after the low pressure air supply mode is used at different speeds.The low-pressure air supply mode can effectively reduce the exhaust temperature of the system,increase the COP and EER of the system,improve the stability of the system greatly.The abrove results show that when the exhaust temperature of the system is large,the low-pressure air supply mode can be opened to improve the stability of the system.