摘要
考虑实际流体热力学性质、混合效率和激波等因素,建立了喷射器热力学模型,计算结果与文献中实验数据吻合很好。文中计算了采用环境友好工质R134a、R152a、R717、R290、R600a时喷射系数及喷射制冷系统性能系数。结果表明,对于确定几何参数的喷射器,喷射系数和喷射制冷系统性能系数主要取决于膨胀比与压缩比,两者分别随膨胀比的增加而增大,压缩比的增加而减小。太阳能驱动喷射制冷系统时(发生温度在80℃左右),采用R134a可以使喷射系数和喷射制冷系统能效比最大,明显优于其他工质。
The mathematical model for thermodynamic system of ejector was set up taking into account the thermodynamic properties of real fluid, mixing coefficient and shocking phenomena. The simulated results were in good agreement with the experimental data obtained from the document available. The entrainment ratio and performance coefficient of system were compaved using the eco-friendly refrigerants R134a,R152a,R717,R290 and R600a. The results indicated that both entrainment ratio and the performance of system depend mainly on the driving ratio and the compression ratio for a ejector with given geometry, increase with the increment of the driving ratio and decrement of compression ratio. R134a achieved better performance than the other refrigerants in the solar ejector refrigeration system.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2007年第2期130-136,共7页
Acta Energiae Solaris Sinica
基金
南开大学天津大学联合科学研究院基金项目(TD200111)
关键词
喷射器
喷射系数
太阳能喷射制冷
工质优化
ejector
entrainment ratio
solar ejector refrigeration
optimum refrigerant
