摘 要： 为了进一步改善热泵系统性能和扩大其运行工况范围，将结构简单、无运动部件且能较好地适应两相流工况的喷射器引入准二级压缩热泵系统，构造出准二级压缩 - 喷射复合热泵系统。在冷凝温度为 45 ℃ 、蒸发温度在 -8 ℃ 到 -25 ℃ 变化的不同工况下，详细测量不同喷射系数和设计结构的喷射器对该复合热泵系统性能的影响，结果表明：喷射系数和设计结构较合理的喷射器，可以使复合热泵系统在较宽广的工况范围内具有较高的效率，且喷射系数 u=0.1 时热泵系统性能最好。

    关键词： 热工学；热泵；试验研究；喷射器
 
Effects of Ejector on Performances of Quasi Two-stage Compression Heat Pump System Coupled with Ejector
PANG 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 operation conditions of heat pumps. An experiment for the prototype of the heat pump system coupled with ejector was conducted at a condensation temperature of 45 ℃ and evaporation temperatures from -8 ℃ to -25 ℃ . 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 the ejecting coefficient is 0.1. 9 Ref. In Chinese.

Keywords Pyrology; Heat pump; Experimental; Ejector