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Journal ArticleDOI

A 1-D analysis of ejector performance

TL;DR: In this paper, a 1D analysis for the prediction of ejector performance at critical-mode operation is carried out, where constant pressure mixing is assumed to occur inside the constant-area section of the ejector and the entrained flow at choking condition is analyzed.
Abstract: A 1-D analysis for the prediction of ejector performance at critical-mode operation is carried out in the present study. Constant-pressure mixing is assumed to occur inside the constant-area section of the ejector and the entrained flow at choking condition is analyzed. We also carried out an experiment using 11 ejectors and R141b as the working fluid to verify the analytical results. The test results are used to determine the coefficients, h p, h s, f p and f m defined in the 1-D model by matching the test data with the analytical results. It is shown that the1-D analysis using the empirical coefficients can accurately predict the performance of the ejectors. q 1999 Elsevier Science Ltd and IIR. All rights reserved.

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Citations
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Journal ArticleDOI
TL;DR: In this paper, a comprehensive literature review on ejector refrigeration systems and working fluids is presented, which deeply analyzes ejector technology and behavior, refrigerant properties and their influence over ejector performance.
Abstract: The increasing need for thermal comfort has led to a rapid increase in the use of cooling systems and, consequently, electricity demand for air-conditioning systems in buildings. Heat-driven ejector refrigeration systems appear to be a promising alternative to the traditional compressor-based refrigeration technologies for energy consumption reduction. This paper presents a comprehensive literature review on ejector refrigeration systems and working fluids. It deeply analyzes ejector technology and behavior, refrigerant properties and their influence over ejector performance and all of the ejector refrigeration technologies, with a focus on past, present and future trends. The review is structured in four parts. In the first part, ejector technology is described. In the second part, a detailed description of the refrigerant properties and their influence over ejector performance is presented. In the third part, a review focused on the main jet refrigeration cycles is proposed, and the ejector refrigeration systems are reported and categorized. Finally, an overview over all ejector technologies, the relationship among the working fluids and the ejector performance, with a focus on past, present and future trends, is presented.

359 citations


Cites background from "A 1-D analysis of ejector performan..."

  • ...Recently, Kasperski and Gil [191] presented a theoretical analysis based on a 1D model developed by Huang et al. (1999) [241]....

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Journal ArticleDOI
TL;DR: A literature review on ejectors and their applications in refrigeration can be found in this article, where a number of studies are grouped and discussed in several topics, i.e. background and theory of ejector and jet refrigeration cycle, performance characteristics, working fluid and improvement of jet refrigerator.
Abstract: This paper provides a literature review on ejectors and their applications in refrigeration. A number of studies are grouped and discussed in several topics, i.e. background and theory of ejector and jet refrigeration cycle, performance characteristics, working fluid and improvement of jet refrigerator. Moreover, other applications of an ejector in other types of refrigeration system are also described.

339 citations

Journal ArticleDOI
TL;DR: In this paper, the performance of six well-known turbulence models for the study of supersonic ejectors was evaluated and the results showed that the k-omega-sst model agrees best with experiments.

323 citations

Journal ArticleDOI
TL;DR: In this paper, the authors investigated the use of CFD in predicting performance of a steam ejector used in refrigeration applications and found that CFD was not only a sufficient tool in predicting ejector performance but also provided a better understanding in the flow and mixing processes within the ejector.

312 citations

Journal ArticleDOI
TL;DR: In this paper, the effects of two important ejector geometry parameters, the primary Nozzle Exit Position (NXP) and the mixing section converging angle θ, on its performance were investigated.

262 citations

References
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Journal ArticleDOI

514 citations


"A 1-D analysis of ejector performan..." refers background or methods in this paper

  • ...[3] assumed that the pressures of the primary and the entrained flows at the exit of the nozzle have an identical pressure....

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  • ...[3] is however unable to analyze the choking of the entrained flow at critical operation mode....

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  • ...[3] assumed that mixing of the two streams takes place inside the suction chamber with a constant or uniform pressure from the exit of the nozzle to the inlet of the constant-area section....

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  • ...[3] was frequently used in the analysis of constant-pressure ejector [1,4,5]....

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Journal ArticleDOI
TL;DR: In this paper, a small-capacity steam jet refrigerator has been tested with boiler temperatures in the range 120-140°C and the experimental data were found to be within 85% of the theoretical values.
Abstract: The paper provides the results of a theoretical and experimental study of a steam jet refrigerator. A small-capacity steam jet refrigerator has been tested with boiler temperatures in the range 120–140°C. The experimental data were found to be within 85% of the theoretical values. The experiments showed that choking of the secondary flow in the mixing chamber of the ejector plays an important role in the system performance. Maximum COP was obtained when the ejector was operated at its critical flow condition. Off-design performance characteristics of the system are provided.

317 citations


"A 1-D analysis of ejector performan..." refers background in this paper

  • ...whereVm is the velocity of the mixed flow andfm is the coefficient accounting for the frictional loss [8]....

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Journal ArticleDOI

302 citations


"A 1-D analysis of ejector performan..." refers background in this paper

  • ...In practice, two choking phenomena exist in the ejector performance [6,7]: one in the primary flow through the nozzle and the other in the entrained flow....

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  • ...Munday and Bagster [6] postulated that after exhausting from the nozzle, the primary flow fans out without mixing with the entrained flow and induces a converging duct for the entrained flow....

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  • ...A hypothetical throat area, or “effective areaAe” [6,7], was defined for the entrained flow at critical operation mode....

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Journal ArticleDOI
TL;DR: In this article, an experimental study of a steam-ejector refrigerator using an ejector with a primary nozzle that could be moved axially within the mixing chamber section was performed.
Abstract: This paper describes an experimental study of a steam-ejector refrigerator using an ejector with a primary nozzle that could be moved axially within the mixing chamber section. The effects on coefficient of performance and cooling capacity produced by adjusting the position of the nozzle were studied. The experimental rig and method are described and results are presented which clearly show the benefit of using such a primary nozzle.

186 citations


"A 1-D analysis of ejector performan..." refers background in this paper

  • ...The nozzle position is also an important factor affecting the ejector performance [11]....

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Journal ArticleDOI
01 Oct 1996-Energy
TL;DR: In this article, the effect of ejector geometries on performance was analyzed for a 5kW steam-jet refrigerator with variable-geometry ejectors, including flow rates, entrainment ratio and ejector geometry.

171 citations