Optimization on ejector key geometries of a two-stage ejector-based multi-evaporator refrigeration system

Yan, Jia; Wen, Na; Wang, Ling; Li, Xianbi; Liu, Zhan; Li, Shengyu

doi:10.1016/j.enconman.2018.08.110

Cited by 50 publications

(9 citation statements)

References 27 publications

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“…With the new developments in computers and data-processing technologies, recent studies have become more comprehensive on mixing chamber geometry, local flow structure, shock wave formation and irreversibility [138,[201][202][203][204][205][206]. A number of these studies were devoted to turbulence model evaluation and selection with respect to specific requirements in ejector operation based on comparison with local/global data and generating valuable information on local flow structure [75,203,[207][208][209].…”

Section: Numerical Ejector Modelingmentioning

confidence: 99%

Current Advances in Ejector Modeling, Experimentation and Applications for Refrigeration and Heat Pumps. Part 1: Single-Phase Ejectors

et al. 2019

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Ejectors used in refrigeration systems as entrainment and compression components or expanders, alone or in combination with other equipment devices, have gained renewed interest from the scientific community as a means of low temperature heat recovery and more efficient energy use. This paper summarizes the main findings and trends, in the area of heat-driven ejectors and ejector-based machines, using low boiling point working fluids, which were reported in the literature for a number of promising applications. An overall view of such systems is provided by discussing the ejector physics principles, as well as a review of the main developments in ejectors over the last few years. Recent achievements on thermally activated ejectors for single-phase compressible fluids are the main focus in this part of the review. Aspects related to their design, operation, theoretical and experimental approaches employed, analysis of the complex interacting phenomena taking place within the device, and performance are highlighted. Conventional and improved ejector refrigeration cycles are discussed. Some cycles of interest employing ejectors alone or boosted combinations are presented and their potential applications are indicated.

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Section: Numerical Ejector Modelingmentioning

confidence: 99%

Current Advances in Ejector Modeling, Experimentation and Applications for Refrigeration and Heat Pumps. Part 1: Single-Phase Ejectors

et al. 2019

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“…Apart from the above-mentioned studies, an ejector-based multi-evaporator refrigeration system (EMERS) was recently proposed and studied by some researchers [ 22 , 23 , 24 ]. The schematic and P–h diagram of an EMERS are displayed in Figure 1 a,b, respectively [ 22 ].…”

Section: Introductionmentioning

confidence: 99%

“…The schematic and P–h diagram of an EMERS are displayed in Figure 1 a,b, respectively [ 22 ]. For such system, Wen et al [ 23 , 24 ] studied the effect of key geometric dimensions, operating conditions and cooling loads on ejector performances with 2D simulation methods. Li et al [ 22 , 25 ] investigated the effect of crucial ejector geometries on ejector performances of such system by using a 2D numerical study.…”

Section: Introductionmentioning

confidence: 99%

Optimization on Secondary Flow and Auxiliary Entrainment Inlets of an Ejector by Using Three-Dimensional Numerical Study

Yan

Jiang²,

Wang

2022

Entropy

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In this paper, by using three-dimensional numerical simulations, the optimization of the cross-sectional area and angle of the secondary flow inlet is first conducted. Then, to further improve the ejector performance, an auxiliary entrainment is proposed and the optimization of the relative position, cross-sectional area and angle of the auxiliary entrainment inlet is accordingly performed by using three-dimensional methods. The results show that: (1) the performance of the ejector with the secondary flow in a vertical direction to the primary flow is slightly better than that in a parallel direction to the primary flow; (2) the effect of the cross-sectional area of the secondary flow has a relatively evident influence on ER, but its effect becomes ignored when the inlet area increases to a certain value; (3) the relative position and axial width of the auxiliary entrainment inlet are important factors influencing ejector performance, and after the optimization of these two geometries, the ejector ER can be increased by 97.7%; and (4) the optimization of the auxiliary entrainment inlet has a substantial effect on the ejector performance as compared to that of the secondary flow inlet. The novelty of this study is that the effect of an auxiliary entrainment on the ejector’s performance is identified by using a three-dimensional numerical simulation for the first time.

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“…Liu et al [9] and Dong et al [10] studied a two-phase flow ejector with variable geometry and found that the efficiency decreased with decreasing ejector area ratio. Yan et al [11] regarded the two ejectors as a whole and used two-dimensional Computational Fluid Dynamics (CFD) and experimental methods to explore the effect of key parameters on its performance. Ultimately, these researchers proposed that the parameter with the greatest effect on the entrainment ratio is the area ratio (AR).…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Performance and Spray Characteristics of a Supersonic Two-Phase Flow Ejector with Different Structures

Liu

et al. 2020

Energies

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A two-phase flow ejector is an important part of a water mist fire suppression system, and these devices have become a popular research topic in recent years. This paper proposes a supersonic ejector that aims to improve the efficiency of water mist fire suppression systems. The effects of ejector geometric parameters on the entrainment ratio (ER) were explored. The effects of primary flow pressure (P P ) on the mixing process and flow phenomena were studied by a high-speed camera. The experimental results show that the ER first increases and then decreases with increasing P P . ER increases with increasing ejector area ratio (AR). The P P corresponding to the maximum ER of ejectors with a different nozzle exit position (NXP) is 3.6 bar. The ejector with an NXP of +1 and AR of 6 demonstrate the best performance, and the ER of this ejector reaches 36.29. The spray half-cone angle of the ejector increases with increasing ER, reaching a maximum value of 7.07 • . The unstable atomization half-cone angle is mainly due to a two-phase flow pulsating phenomenon. The pulsation period is 10 ms. In the present study, a general rule that provides a reference for ejector design and selection was obtained through experiments.

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Optimization on ejector key geometries of a two-stage ejector-based multi-evaporator refrigeration system

Cited by 50 publications

References 27 publications

Current Advances in Ejector Modeling, Experimentation and Applications for Refrigeration and Heat Pumps. Part 1: Single-Phase Ejectors

Current Advances in Ejector Modeling, Experimentation and Applications for Refrigeration and Heat Pumps. Part 1: Single-Phase Ejectors

Optimization on Secondary Flow and Auxiliary Entrainment Inlets of an Ejector by Using Three-Dimensional Numerical Study

Experimental Investigation of the Performance and Spray Characteristics of a Supersonic Two-Phase Flow Ejector with Different Structures

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