永磁同步变频离心式冷水机组的研制及性能分析

Development and Performance Analysis of the Permanent-magnetic Synchronous Frequency-convertible Centrifugal Chiller

提升离心式冷水机组的满负荷能效系数(COP)与综合部分负荷能效系数(IPLV),对于我国公共建筑节能具有非常重要的意义。永磁同步变频离心式冷水机组采用了双级压缩中间补气循环、压缩机全工况气动设计、高速电机直接驱动结构、高速大功率永磁同步变频调速电机及相应变频器等关键技术,其循环效率、绝热效率、机械效率、电机效率、变频器效率等均得到大幅提升。实测结果显示,永磁同步变频离心式冷水机组的额定工况COP达到7.03,IPLV达到11.68,部分负荷最高COP达到20.30,其性能相对于常规变频离心式冷水机组大幅提高。

Improvement of Coefficient of Performance （COP） and Integrated Part Load Value （IPLV） of the centrifugal chiller is highly important for the energy saving of public buildings in China.The Permanent-magnetic Synchronous Frequency-convertible （PSF） centrifugal chiller applies many key technologies,such as the double-stage compression with flash-gas inter-stage suction cycle,the pneumatic design of the compressor under wide-range operation conditions,the directly-driven compressor by high-speed motor,the high-speed large-power PSF motor with corresponding frequency converter etc.The performance indexes of the PSF cen-trifugal chiller,including the cyclic efficiency,isentropic efficiency,mechanic efficiency,motor efficiency and frequency converting efficiency,have been greatly improved.Experimental results of the 1000 RT PSF centrifugal chiller show that the rating COP rea-ches 7.03,the IPLV reaches 11.68,and the maximum part load COP reaches 20.30.The performance of the PSF centrifugal chil-ler is much better than that of a common frequency-convertible centrifugal chiller.