Energetic and Exergetic Analysis of an Ejector-Expansion Refrigeration Cycle Using the Working Fluid R32

The performance characteristics of an ejector-expansion refrigeration cycle (EEC) using R32 have been investigated in comparison with that using R134a. The coefficient of performance (COP), the exergy destruction, the exergy efficiency and the suction nozzle pressure drop (SNPD) are discussed. The results show that the application of an ejector instead of a throttle valve in R32 cycle decreases the cycle’s total exergy destruction by 8.84%–15.84% in comparison with the basic cycle (BC). The R32 EEC provides 5.22%–13.77% COP improvement and 5.13%–13.83% exergy efficiency improvement respectively over the BC for the given ranges of evaporating and condensing temperatures. There exists an optimum suction nozzle pressure drop (SNPD) which gives a maximum system COP and volumetric cooling capacity (VCC) under a specified condition. The value of the optimum SNPD mainly depends on the efficiencies of the ejector components, but is virtually independent of evaporating temperature and condensing temperature. In addition, the improvement of the component efficiency, especially the efficiencies of diffusion nozzle and the motive nozzle, can enhance the EEC performance.

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

[2]  Masafumi Nakagawa,et al.  Experimental investigation on the effect of mixing length on the performance of two-phase ejector for CO2 refrigeration cycle with and without heat exchanger , 2011 .

[3]  Armin Hafner,et al.  A CFD-based investigation of the energy performance of two-phase R744 ejectors to recover the expansion work in refrigeration systems: An irreversibility analysis , 2014 .

[4]  Eckhard A. Groll,et al.  Investigation on performance of variable geometry ejectors for CO2 refrigeration cycles , 2012 .

[5]  Alan A. Kornhauser,et al.  The Use of an Ejector as a Refrigerant Expander , 1990 .

[6]  Michel Feidt,et al.  Comparison of the working domains of some compression heat pumps and a compression-absorption heat pump , 1997 .

[7]  Zhenying Zhang,et al.  Effect of Suction Nozzle Pressure Drop on the Performance of an Ejector-Expansion Transcritical CO2 Refrigeration Cycle , 2014, Entropy.

[8]  Eckhard A. Groll,et al.  Transcritical CO2 refrigeration cycle with ejector-expansion device , 2005 .

[9]  H. Kursad Ersoy,et al.  Performance improvement of the vapour compression refrigeration cycle by a two‐phase constant area ejector , 2009 .

[10]  Somchai Wongwises,et al.  Performance of the two-phase ejector expansion refrigeration cycle , 2005 .

[11]  Predrag Stojan Hrnjak,et al.  Ejector in R410A vapor compression systems with experimental quantification of two major mechanisms of performance improvement: Work recovery and liquid feeding , 2015 .

[12]  Jahar Sarkar,et al.  Performance characteristics of natural-refrigerants- based ejector expansion refrigeration cycles , 2009 .

[13]  Neal Lawrence,et al.  Experimental investigation of a two-phase ejector cycle suitable for use with low-pressure refrigerants R134a and R1234yf , 2014 .

[14]  M. Goodarzi,et al.  Comparative analysis of an improved two-stage multi-inter-cooling ejector-expansion trans-critical CO2 refrigeration cycle , 2015 .

[15]  Arif Hepbasli,et al.  Energetic and exergetic comparison of basic and ejector expander refrigeration systems operating under the same external conditions and cooling capacities , 2015 .

[16]  Stefan Elbel,et al.  Historical and present developments of ejector refrigeration systems with emphasis on transcritical carbon dioxide air-conditioning applications , 2011 .

[17]  Souvik Bhattacharyya,et al.  Thermodynamic design and simulation of a CO2 based transcritical vapour compression refrigeration system with an ejector , 2014 .

[18]  Xianbiao Bu,et al.  Performance characteristics of R1234yf ejector-expansion refrigeration cycle , 2014 .

[19]  Yitai Ma,et al.  Theoretical evaluation on effect of internal heat exchanger in ejector expansion transcritical CO2 refrigeration cycle , 2013 .

[20]  H. Kursad Ersoy,et al.  Performance characteristics of ejector expander transcritical CO2 refrigeration cycle , 2012 .

[21]  Farid Nasir Ani,et al.  A review on two-phase ejector as an expansion device in vapor compression refrigeration cycle , 2012 .

[22]  F. A. Manjili,et al.  Performance of a new two-stage multi-intercooling transcritical CO2 ejector refrigeration cycle , 2012 .

[23]  Min-Soo Kim,et al.  Studies on the performance of a CO2 air conditioning system using an ejector as an expansion device , 2014 .

[24]  E. Nehdi,et al.  Performance analysis of the vapour compression cycle using ejector as an expander , 2007 .