18 May 2017
Permanent-magnetic Synchronous Frequency-convertible (PSF) compressor as a new technology has been widely used in heating, ventilation and air conditioning. For centrifugal compressor, some key technologies of large working range 3-Dimentional impeller, 360° circular refrigerant injection port, two-stage impeller directly driven by PSF motor and high-speed inverter are adopted to improve the compressor efficiency. The detail information of these technologies is introduced to show the advantage of efficiency improvement. Experimental results show that the adiabatic efficiency of PSF compressor is 78.1%~87.6%, which is much higher than the conventional frequency-convertible centrifugal compressor. The mechanical efficiency and motor efficiency of PSF compressor are 97%~98.8% and 95%~97.6%, respectively. To further evaluate the system performance of PSF centrifugal heat pump system, a district heating project with waste heat recovery from industry was conducted in Lijingwan community, Shijiazhuang City, Hebei Province. Filed testing results have shown that the heating COP of 500 RT centrifugal heat pump units is up to 6.2 with the water outlet temperature of 10? in evaporator side under full load condition.