Study on the key ejector structures of the waste heat-driven ejector air conditioning system with R236fa as working fluid

Abstract The ejector performance is numerically and experimentally studied using R236fa as working fluid to analyze the influence of the key geometries of ejector. The computational fluid dynamics (CFD) was employed to predict the flow process and performance of the ejector. A case study was provided in this paper, in which the angles of nozzle outlet were 8°, 10° and 14°, the distance of nozzle exit to mixing chamber was varied as 23 and 33 mm and the length of diffuser was varied as 88 and 103 mm. The CFD results were verified with an experiment. It can be concluded that, the ejector with the nozzle outlet angle of 8°, the distance of nozzle exit to mixing chamber of 23 mm and the diffuser length of 88 mm has the best performance.

[1]  Bin-Juine Huang,et al.  A 1-D analysis of ejector performance , 1999 .

[2]  Mofreh H. Hamed,et al.  Optimal Performance and Geometry of Supersonic Ejector , 2008 .

[3]  Saffa Riffat,et al.  CFD modelling and experimental investigation of an ejector refrigeration system using methanol as the working fluid , 2001 .

[4]  A computational analysis of unsteady transonic/supersonic flows over backward facing step in air jet nozzle , 2007 .

[5]  Masud Behnia,et al.  Investigation and improvement of ejector refrigeration system using computational fluid dynamics technique , 2007 .

[6]  Rafet Yapici,et al.  Experimental investigation of performance of vapor ejector refrigeration system using refrigerant R123 , 2008 .

[7]  A. Khalil,et al.  Ejector design and theoretical study of R134a ejector refrigeration cycle , 2011 .

[8]  Da-Wen Sun,et al.  Comparative study of the performance of an ejector refrigeration cycle operating with various refrigerants , 1999 .

[9]  Bin-Juine Huang,et al.  Empirical correlation for ejector design , 1999 .

[10]  Hyomin Jeong,et al.  CFD investigation on the flow structure inside thermo vapor compressor. , 2010 .

[11]  T. Sriveerakul,et al.  Performance prediction of steam ejector using computational fluid dynamics: Part 1. Validation of the CFD results , 2007 .

[12]  Andrew Ooi,et al.  CFD analysis of ejector in a combined ejector cooling system , 2005 .

[13]  K. F. Fong,et al.  Improvement of solar-electric compression refrigeration system through ejector-assisted vapour compr , 2011 .

[14]  Yann Bartosiewicz,et al.  Numerical assessment of ejector operation for refrigeration applications based on CFD , 2006 .