工况对两相流引射制冷系统性能的影响

Effects of working conditions on the performance of the two-phase ejector refrigeration system

以R134a为工质,在不同工况条件下采用两段式喷嘴引射器对两相流引射制冷系统进行了实验研究,分析了冷凝温度和蒸发温度对R134a两相流引射制冷系统性能COP和引射比的影响,并与传统制冷循环系统进行了比较。实验结果表明:对于一定几何尺寸的引射器,系统COP随冷凝温度的升高而降低,随蒸发温度的升高而增大,在冷凝温度为40℃时,蒸发温度为1℃时,使用两段式喷嘴引射器时系统的COP要比传统蒸汽压缩循环的COP高22.7%,两相流引射制冷循环系统在较低的冷凝温度下更具有优势。

The experimental studies on the performance of the two -phase ejector refrigeration system with the refrigerant R134a as working fluid under different operating conditions were carried out. The influence of the condensing and evaporating temperatures on coefficient of performance （COP） of the system and the entrainment ratio of the ejector were analyzed compared with the traditional refrigeration cycle. The experimental results indicate that for a fixed geometric parameter, the COP of the two - phase ejector refrigeration system decreases with the increase of condensing temperatures, and increases with the increase of the evaporating temperatures. The COP of the two - phase ejector refrigeration system with evaporating temperatures of 1 ℃ and condensing temperature of 40℃ is increased by 22.7% approximately when compared with the traditional refrigeration cycle. The two - phase ejector refrigeration system have obvious advantage under the condition of low condensing temperatures.