Journal ArticleDOI
A 1-D analysis of ejector performance
TLDR
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.read more
Citations
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Proceedings ArticleDOI
Development of Control Model for Critical Operation Ejector
TL;DR: In this article, a simple, yet accurate hybrid ejector model is presented, which is induced by shock circle model based on fluid dynamics and energy balance principles, which gives a better match to real performances of all the 11 different ejectors over the entire operating range when compared to existing models in the literature.
Journal ArticleDOI
Optimal design of a novel nested-nozzle ejector for PEMFC's hydrogen supply and recirculation system
TL;DR: In this article , the authors proposed a novel ejector design with nested nozzles for a Proton Exchange Membrane Fuel Cell (PEMFC) system, which has the advantages of compact size and zero power consumption compared with the HSRS using a recirculation pump.
Journal ArticleDOI
Energy and Exergy Analysis of a Novel Ejector-Assisted Compression-Absorption-Resorption Refrigeration System
Dissertation
Avaliação de modelos de turbulência na previsão do desempenho de ejetores
TL;DR: In this article, the performance of a set of turbulence models, applied to analyze the behavior of ejector refrigeration systems, has been studied, and the results showed that the SST Transition model was the most accurate and consistent in predicting the ejector performance.
References
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Journal ArticleDOI
An Investigation of Ejector Design by Analysis and Experiment
Journal ArticleDOI
A theoretical and experimental study of a small-scale steam jet refrigerator
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.
Journal ArticleDOI
A New Ejector Theory Applied to Steam Jet Refrigeration
John T. Munday,David F. Bagster +1 more
Journal ArticleDOI
A small capacity steam-ejector refrigerator: experimental investigation of a system using ejector with movable primary nozzle
Satha Aphornratana,Ian W. Eames +1 more
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.
Journal ArticleDOI
Variable geometry ejectors and their applications in ejector refrigeration systems
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.