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研究了喷射器内部流体流动过程,应用质量守恒、动量守恒、能量守恒对两相喷射器建立了热力学模型,分析了不同制冷剂对新型双蒸发制冷系统性能的影响。计算结果表明:新型双蒸发系统中,当蒸发和冷凝温度相同时,R152a的性能系数高于其他4种制冷剂,R143a的喷射系数、喷射器的压缩效率、制冷量和性能系数提高率均高于其他4种制冷剂;当蒸发温度不变时,性能系数提高率随着冷凝温度的升高而降低,冷凝温度为30℃时,制冷剂为R143a,性能系数提高率达20%。
The flow of fluid inside the ejector was studied. The thermodynamic model of two-phase ejector was established by using conservation of mass, conservation of momentum and conservation of energy, and the influence of different refrigerants on the performance of the new dual-evaporative refrigeration system was analyzed. The results show that the performance coefficient of R152a is higher than that of the other four refrigerants when the evaporation and condensation temperatures are the same in the new dual-evaporation system. The injection coefficient of R143a, the compression efficiency of the ejector, the cooling capacity and the improvement rate of the coefficient of performance are both high In the other four refrigerants, when the evaporation temperature is constant, the rate of increase of the coefficient of performance decreases with the increase of the condensing temperature. When the condensing temperature is 30 ℃, the refrigerant is R143a and the coefficient of performance is increased by 20%.