The actuality and disadvantages of traditional high power asynchronism motor drive air compressor in locomotive ser-vice plant are discussed. In order to reduce the energy consumption and obtain safe running, a variab...The actuality and disadvantages of traditional high power asynchronism motor drive air compressor in locomotive ser-vice plant are discussed. In order to reduce the energy consumption and obtain safe running, a variable frequency con-trol method to the motor is supplied. A PLC with touch screen is used for monitoring the status of the compressor and its control system. It also presents energy consumption analysis caused by the variable frequency control method in a locomotive service plant.展开更多
利用中间补气技术将单缸滚动转子式压缩机应用于空气源热泵系统中,系统地研究以R410A为冷媒的热泵系统在变频、变补气压力工况下制热性能的变化规律。实验结果表明:中间补气系统的制热量及系统功率均随着压缩机频率f、中间补气压力pinj...利用中间补气技术将单缸滚动转子式压缩机应用于空气源热泵系统中,系统地研究以R410A为冷媒的热泵系统在变频、变补气压力工况下制热性能的变化规律。实验结果表明:中间补气系统的制热量及系统功率均随着压缩机频率f、中间补气压力pinj的增加呈上升趋势,同频率下系统功率则以线性方式增长,而系统制热量随着补气压力及频率的增大,其相对增长率逐渐减小。因此COPh在低频时存在最佳补气压力,而在高频时无极值点;与单级压缩系统相比,在800~1200 k Pa、50~80 Hz范围内,中间补气系统的制热量、功率、COPh最大提升分别为27.55%、30.75%、7.1%。随着频率及补气压力的增加,系统COPh下降,因此中间补气技术应与合理的控制策略相结合,可使中间补气系统达到节能高效的目的。展开更多
文摘The actuality and disadvantages of traditional high power asynchronism motor drive air compressor in locomotive ser-vice plant are discussed. In order to reduce the energy consumption and obtain safe running, a variable frequency con-trol method to the motor is supplied. A PLC with touch screen is used for monitoring the status of the compressor and its control system. It also presents energy consumption analysis caused by the variable frequency control method in a locomotive service plant.
文摘利用中间补气技术将单缸滚动转子式压缩机应用于空气源热泵系统中,系统地研究以R410A为冷媒的热泵系统在变频、变补气压力工况下制热性能的变化规律。实验结果表明:中间补气系统的制热量及系统功率均随着压缩机频率f、中间补气压力pinj的增加呈上升趋势,同频率下系统功率则以线性方式增长,而系统制热量随着补气压力及频率的增大,其相对增长率逐渐减小。因此COPh在低频时存在最佳补气压力,而在高频时无极值点;与单级压缩系统相比,在800~1200 k Pa、50~80 Hz范围内,中间补气系统的制热量、功率、COPh最大提升分别为27.55%、30.75%、7.1%。随着频率及补气压力的增加,系统COPh下降,因此中间补气技术应与合理的控制策略相结合,可使中间补气系统达到节能高效的目的。
