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Flow visualization in CO2 two-phase ejector in refrigeration system
Review of Scientific InstrumentsIn transcritical CO2 refrigeration systems, replacing the throttle valve with a two-phase ejector markedly enhances energy recovery during the expansion process. This study comprehensively reviews the application of supersonic flow visualization techniques in two-phase ejectors.
Linan Guan +6 more
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Expansion of subcooled refrigerant in two-phase ejectors with no flux induction
Experimental Thermal and Fluid Science, 2017Abstract An experimental study of R134a refrigerant expansion in a two-phase ejector with no induced flux has been performed under a number of conditions commonly encountered in refrigerators and heat pumps. The intent is to develop a better understanding of the parameters and conditions influencing the critical flow, necessary for efficient and ...
K. Ameur, Z. Aidoun, M. Ouzzane
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Thermodynamic Analysis of R410A Refrigeration Cycle with a Two-Phase Ejector
Applied Mechanics and Materials, 2014A thermodynamic analysis of the ejector expansion refrigeration cycle (EERC) was carried out based on a two-phase flow model. First the ejector parameter was optimized under the given condition. Then the influence of condenser temperature and evaporator was investigated.
Ji Chao Hu +2 more
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Experimental Study of a Constant-Area Ejector With Two-Phase Fluids
Volume 2: Symposia, Parts A, B, and C, 2003The authors are presently involved in developing a design code to optimize an active space thermal management system that includes as a key component an ejector, which operates with fluids in the two-phase regime. In order to validate this code, and for other applications of two-phase ejectors, a comprehensive experimental data set is needed for this ...
J. A. Bray, W. E. Lear, S. A. Sherif
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Multidimensional Modeling of Condensing Two-Phase Ejector Flow
2011Condensing ejectors utilize the beneficial thermodynamics of condensation to produce an exiting static pressure that can be in excess of either entering static pressure. The phase change process is driven by both turbulent mixing and interphase heat transfer.
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Two-phase radial ejector for transcritical CO2 refrigeration
Physics of FluidsTranscritical refrigeration systems using natural refrigerants like CO2 operate on the ejector–expansion cycle to achieve high operating efficiency. The variability of ejector geometry dictates the adjustability of refrigerating capacity in such systems.
Jishnu Chandran Ramachandran +3 more
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Development of a Simple Homogeneous Flow Model of a Two-Phase Ejector
SAE Technical Paper Series, 1999<div class="section abstract"><div class="htmlview paragraph">This paper first briefly reviews the concept of ejector-driven heating and refrigerating systems. The advantages of these systems over conventional systems are outlined. The issue of momentum mismatch between the primary and secondary flows in ejectors is identified as the ...
Hany A. M. Al-Ansary, Sheldon M. Jeter
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Modeling and numerical approach for the design and operation of two-phase ejectors
Applied Thermal Engineering, 2016Abstract This paper presents a modeling procedure of liquid–vapour ejectors for refrigeration, heat pumps and several other potential industrial applications. Fluid flow in the ejector is two-phase and compressible. The modeling relies on a thermodynamic approach where conservation equations and properties of real refrigerants are being used ...
Khaled Ameur +2 more
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Advanced exergy analysis of a CO2 two-phase ejector
Applied Thermal Engineering, 2022Lixing Zheng +3 more
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