高效永磁同步变频离心式冰蓄冷双工况机组的研制

Development of the High-efficiency Dual-mode Permanent-magnetic Synchronous Frequency-convertible Centrifugal Chiller for Ice Storage System

研制满足冰蓄冷空调系统的大冷量变频离心机,有利于促进冰蓄冷空调技术进一步发展,对于平衡电网负荷、减少装机容量、降低运行费用、节约能源与环境保护等具有重要意义。为了满足离心式冰蓄冷双工况机组对高压比、变压比、高效率、大冷量的技术要求,采用了双级压缩中间补气制冷循环,双工况多点气动设计,高速电机直驱技术,高速永磁同步电机及变频系统等关键技术。实测结果显示,8438k W永磁同步变频离心式冰蓄冷双工况机组额定工况COP达6.60,制冰工况COP达4.59,IPLV达到11.17,相对于传统定频双工况机组具有明显的性能优势。

Development of the large-cooling-load frequency-convertible centrifugal chiller improves the ice storage air condition-ing technology, and it＇s highly important for balancing power network load, reducing installing cooling load, reducing operation costs, saving energy and protecting the environment. In order to satisfy the technical demand of high compression ratio, variable compression ratio, high efficiency and large cooling load, the dual-mode 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 dual-mode multi-points operation conditions,the directly-driven compressor by high - speed motor, the high-speed large-power PSF motor with the frequency converter etc. Experimental results of the 8438kW Dual-mode PSF centrifugal chiller show that the rating COP reaches 6. 60, the COP under ice-storage mode reaches 4. 59,the IPLV reaches 11. 17. The performance of the Dual-mode PSF centrifugal chiller is much better than that of a common dual-mode frequency-unconvertible centrifugal chiller.