Ejector design and theoretical study of R134a ejector refrigeration cycle

Abstract In the present paper, a mathematical model is developed to design R134a ejector and to predict the performance characteristics of a vapor jet refrigeration system over a wide range of the investigated parameters. These parameters include boiling temperature (65–85 °C), condensing temperature (25–40 °C), evaporating temperature (0–10 °C), degrees of superheat (0–15 °C), nozzle efficiency (0.75–0.95) and diffuser efficiency (0.75–0.95). Simulated results showed that the present model data are in good agreement with experimental data in the literature with an average error of 6%. It is found that the ejector area ratio at boiling temperature of 85 °C is about double that at boiling temperature of 65 °C for various evaporating and condensing temperatures. The present results confirm that waste heat sources of temperature ranging from 65 to 85 °C are adequate to operate vapor jet refrigeration system for air-conditioning applications.

[1]  A. K. Oppenheim,et al.  Fundamentals of Gas Dynamics , 1964 .

[2]  Somchai Wongwises,et al.  Experimental investigation on the performance of the refrigeration cycle using a two-phase ejector as an expansion device , 2004 .

[3]  Da-Wen Sun,et al.  Variable geometry ejectors and their applications in ejector refrigeration systems , 1996 .

[4]  A. Selvaraju,et al.  Analysis of an ejector with environment friendly refrigerants , 2004 .

[5]  G. K. Alexis,et al.  Performance characteristics of a methanol ejector refrigeration unit , 2004 .

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

[7]  K. Cizungu,et al.  Performance comparison of vapour jet refrigeration system with environment friendly working fluids , 2001 .

[8]  I. Alatiqi,et al.  Evaluation of steam jet ejectors , 2002 .

[9]  A. Selvaraju,et al.  Experimental investigation on R134a vapour ejector refrigeration system , 2006 .

[10]  A Selvaraju,et al.  Analysis of a vapour ejector refrigeration system with environment friendly refrigerants , 2004 .

[11]  Da-Wen Sun,et al.  Performance characteristics of HCFC-123 ejector refrigeration cycles , 1996 .

[12]  E. D. Rogdakis,et al.  Design and parametric investigation of an ejector in an air-conditioning system , 2000 .

[13]  M Ouzzane,et al.  Model development and numerical procedure for detailed ejector analysis and design , 2003 .

[14]  G. K. Alexis,et al.  Estimation of ejector's main cross sections in steam-ejector refrigeration system , 2004 .

[15]  G. K. Alexis,et al.  A solar ejector cooling system using refrigerant R134a in the Athens area , 2005 .

[16]  N. Khattab,et al.  Modeling the design and performance characteristics of solar steam-jet cooling for comfort air conditioning , 2002 .

[17]  Aly Karameldin,et al.  Modelling and simulation of steam jet ejectors , 1999 .

[18]  Mohamed Ouzzane,et al.  The effect of operating conditions on the performance of a supersonic ejector for refrigeration , 2004 .

[19]  J. C. Champoussin,et al.  Les paramètres géométriques optima d'un éjecto-compresseur frigorifique , 1993 .

[20]  K. Cizungu,et al.  Modelling and optimization of two-phase ejectors for cooling systems , 2005 .

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