Abstract: In order to further improve the performance of heat pump system and extend its operating range, a quasi-two-stage compression heat pump system is introduced into injectors with simple structure and no moving parts, which can well adapt to the two-phase flow. Compression - injection heat pump system. The effect of injectors with different injection coefficients and design structures on the performance of the combined heat pump system was measured under the different operating conditions of condensation temperature of 45 ℃ and evaporation temperature of -8 ℃ to -25 ℃. The results show that the injection coefficient and The design of a reasonable structure of the ejector, the composite heat pump system can be in a wide range of operating conditions with high efficiency, and the injection coefficient u = 0.1 heat pump system best performance. Key words: thermal engineering; heat pump; experimental study; ejector Effects of Ejector on Performances of Quasi Two-stage Compression Heat Pump System Coupled with EjectorPANG Zong-zhan ☆ MA Guo-yuan ☆ Beijing University of Technology, Beijing 100022, China Abstract A quasi two-stage compression heat pump system coupled with ejector was designed to improve the performance and widen the range of the operating conditions of heat pump. An experiment for the prototype of the heat pump system coupled with ejector was conducted at a condensation temperature of 45 ° C and the evaporation temperatures from -8 ° C to -25 ° C. The effects of the ejectors on the performances of the heat pump were analyzed. The results show that the heat pump coupled with the ejector with optimized construction has higher coefficient of performance in a wide range of operation conditions and can achieve excellent performances while ejecting coefficient is 0.1. 9 Ref. In Chinese. Keywords Pyrology; Heat pump; Experimen tal; Ejector
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