Journal ArticleDOI
Investigation on performance of variable geometry ejectors for CO₂ refrigeration cycles
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TLDR
In this paper, a two-phase flow ejector expansion model was developed and experimentally validated, and a method of determining the efficiencies of ejector motive nozzle, suction nozzle, and mixing section based on the measured performance data external to the ejector was developed.About:
This article is published in Energy.The article was published on 2012-09-01. It has received 108 citations till now. The article focuses on the topics: Nozzle & Injector.read more
Citations
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Journal ArticleDOI
Ejector refrigeration: A comprehensive review
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.
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Review of recent developments in advanced ejector technology
TL;DR: A review of developments in the use of ejectors for expansion work recovery in vapor-compression systems focusing on the past several years is presented.
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Experimental and numerical investigation of the effect of shock wave characteristics on the ejector performance
Yinhai Zhu,Pei-Xue Jiang +1 more
TL;DR: In this paper, the entrainment performance and the shock wave structures in a three-dimensional ejector were investigated by Computational Fluid Dynamics (CFD) and Schlieren flow visualization.
Journal ArticleDOI
Theoretical and practical comparison of two-phase ejector refrigeration cycles including First and Second Law analysis
Neal Lawrence,Stefan Elbel +1 more
TL;DR: In this article, the authors compared the theoretical COP of the standard two-phase ejector refrigeration cycle with a liquid-vapor separator to two alternate, less commonly considered two phase ejector cooling cycles as well as a conventional cycle with an expansion valve.
Journal ArticleDOI
Advanced exergy analyses of an ejector expansion transcritical CO2 refrigeration system
Tao Bai,Jianlin Yu,Gang Yan +2 more
TL;DR: In this paper, a thermodynamic investigation on an ejector expansion transcritical CO2 refrigeration system with advanced exergy analysis is presented, which shows that the compressor with the largest avoidable endogenous exergy destruction possesses the highest priority of improvement, followed by the ejector, evaporator and gas cooler.
References
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Journal ArticleDOI
A New Equation of State for Carbon Dioxide Covering the Fluid Region from the Triple‐Point Temperature to 1100 K at Pressures up to 800 MPa
Roland Span,Wolfgang Wagner +1 more
TL;DR: In this article, the authors present a new equation of state in the form of a fundamental equation explicit in the Helmholtz free energy, which is able to represent even the most accurate data to within their experimental uncertainty.
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.
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An Investigation of Ejector Design by Analysis and Experiment
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Experimental validation of a prototype ejector designed to reduce throttling losses encountered in transcritical R744 system operation
Stefan Elbel,Pega Hrnjak +1 more
TL;DR: Experiments confirmed that like in a conventional transcritical R744 system with expansion valve, the high-side pressure control integrated into the ejector could be used to maximize the system performance.
Journal ArticleDOI
Transcritical CO2 refrigeration cycle with ejector-expansion device
Da Qing Li,Eckhard A. Groll +1 more
TL;DR: In this paper, an ejector expansion transcritical CO2 refrigeration cycle was proposed to improve the COP of the basic CO2 cycle by reducing the expansion process losses and a constant pressure mixing model for the ejector was established to perform the thermodynamic analysis.
Related Papers (5)
Experimental validation of a prototype ejector designed to reduce throttling losses encountered in transcritical R744 system operation
Stefan Elbel,Pega Hrnjak +1 more
Transcritical CO2 refrigeration cycle with ejector-expansion device
Da Qing Li,Eckhard A. Groll +1 more