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从采用先进的变频技术和热泵供暖技术2个方面介绍轨道车辆变频节能空调机组节能原理。在上海轨道交通5号线上，选取列车进行了安装测试，介绍轨道车辆变频节能空调机组的实际应用效果，为变频空调在轨道交通列车中的推广应用提供一定的借鉴作用。“,”The paper describes the working principle of energy- saving air conditioning unit on variable frequency (VF) energy-saving rail vehicle from the two aspects of use of advanced VF technology and heating pump technology. Selecting trains for installation tests on Shanghai urban rail transit line 5, and introducing the practical application effect of VF energy saving air conditioning units on vehicle, it provides a reference for the promotion and application of VF air conditioner on rail transit train.