高速列车空调冷凝风机的变频应用研究

列车在高速运行中表面产生的负压使冷凝风量相继减小.通过数值模拟计算不同车速下冷凝风机入口的平均负压值和冷凝风量,结果表明,高速工况下的负压影响冷凝风机正常运行.选取大容量冷凝风机并采取变频调节方式,建立以冷凝温度为反馈信号的PID控制方式,比较不同车速下定频与变频运行所消耗的功率,得出变频运行冷凝风机在列车低速运行时具有良好的节能效果和一定的变工况适应性,为变频技术在列车冷凝风机上的应用提供了技术依据.

Frequency Conversion Application to Condenser Fan in Air Conditioning System for High-Speed Train

The negative pressure on the surface of high-speed train reduces cooling air volume successively.The average negative pressure value and cooling air volume were obtained by numerical simulations at different speeds.The results show that the negative pressure in high-speed conditions impacts the running of condenser fan.Larger condenser fan was chosen,frequency conversion technique was used,and a PID control method taking condensation temperature as feedback signal was established.The power consumption was compared between variable frequency operation and constant frequency operation at different speeds.It is concluded that the frequency conversion condenser fan has good energy saving effect and load adaptability at low speed.The conclusions provide technical basis for the application of frequency conversion condenser fan to high-speed train.