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Performance analysis of a two-stage ejector in an ejector refrigeration system using computational fluid dynamics
Engineering Applications of Computational Fluid Mechanics ( IF 5.9 ) Pub Date : 2020-05-13 , DOI: 10.1080/19942060.2020.1756913
N. Suvarnakuta 1 , K. Pianthong 1 , T. Sriveerakul 1 , W. Seehanam 1
Affiliation  

In this study, computational fluid dynamics (CFD) was used to investigate the performance of the steam ejector used in refrigeration systems to increase operational flexibility and COP. A 2D-axisymetric model of a two-stage ejector (TSE) was developed and its performance was compared to that of the commonly used single-stage ejector. The SST k-omega (k-ω-sst) model was applied as a turbulence model. In the simulation, the TSE was analyzed using generator temperatures between 100 and 130°C and evaporator temperatures between 0 and 15°C, as in a previous study. The CFD simulation results showed that the TSE provided high entrainment ratios up to 77.2% while showing a marginal decrease in the critical back pressure up to a maximum value of 21.9%. Therefore, it can be concluded that the TSE can significantly benefit refrigeration systems requiring high refrigerating capacity while maintaining a slightly low condensing pressure.



中文翻译:

使用计算流体力学的喷射器制冷系统中两级喷射器的性能分析

在这项研究中,使用计算流体动力学(CFD)来研究制冷系统中使用的蒸汽喷射器的性能,以提高操作灵活性和COP。开发了两级喷射器(TSE)的二维轴向模型,并将其性能与常用的单级喷射器进行了比较。在SST ķ -omega(ķ - ω-sst)模型被用作湍流模型。在仿真中,与以前的研究一样,使用100至130°C的发电机温度和0至15°C的蒸发器温度对TSE进行了分析。CFD仿真结果表明,TSE提供了高达77.2%的高夹带率,同时显示出临界背压略有下降,最大值降低到21.9%。因此,可以得出结论,TSE可以显着受益于需要高制冷能力的制冷系统,同时保持稍低的冷凝压力。

更新日期:2020-05-13
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