An experimental transcritical CO2 heat pump water heater system was designed
and the measurement and control system for testing was developed.The flow rate
entrainment ratio
compression ratio and efficiency of ejector were investigated.The experimental results showed that:the increase of both primary fluid pressure and entrained fluid pressure can improve the performance of the ejector
the decrease of primary fluid pressure or the increase of entrained fluid pressure can improve the ejector working perfection.Development of high efficient ejector was a critical factor on optimizing transcritical CO2 heat pump system.