International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 03 Issue: 05 | May-2016 www.irjet.net p-ISSN: 2395-0072 © 2016, IRJET | Impact Factor value: 4.45 | ISO 9001:2008 Certified Journal | Page 2441 Development Practices in Ejector Technology for Refrigeration and Air Conditioning Applications DR K. Ashok Reddy Professor, Dept of Mechanical Engineering, MLR Institute of Technology , Dundegal (V) , Hyderabad-43 Abstract : This paper presents a comprehensive literature review on ejector refrigeration systems and working fluids. It deeply analyzes ejector technology and behavior, refrigerant properties and their influence over ejector performance and all of the ejector refrigeration technologies, with a focus on past, present and future trends. Ejector technology was described and description of the refrigerant properties and their influence over ejector performance was highlighted. A review on development practices in ejector technology for refrigeration and air conditioning applications have been presented by various researchers was made available in this paper. Keywords: ejector, refrigerant, air conditioning, vapor compression etc. I. INTRODUCTION Hasan Sh. Majdi [1] presented in their paper to develop a computer simulation program to evaluate the performance of solar-assited combined ejector absorption (single- effect) cooling system using LiBr/H2O as a working fluid and operating under steady-state conditions. The ejector possess no moving parts and is simple and reliable, which makes it attractive for combination with single-stage absorption cycle for further improvement to the system's performance. In this research, improvement to the system is achieved by utilizing the potential kinetic energy of the ejector to enhance refrigeration efficiency. The effects of the entrainment ratio of the ejector, operating temperature, on the thermal loads, and system performance have been investigated. The results showed that the evaporator and condenser loads, post-addition of the ejector, is found to be permanently higher than that in the basic cycle, which indicates a significant enhancement of the proposed cycle and the cooling capacity of the system increasing with the increase in evaporator temperature and entrainment ratio. The COP of the modified cycle is improved by up to 60 % compared with that of the basic cycle at the given condition. This process stabilizes the refrigeration system, enhanced its function, and enabled the system to work under higher condenser temperatures. Giorgio Besagni et al [2] presented in their paper the increasing need for thermal comfort has led to a rapid increase in the use of cooling systems and, consequently, electricity demand for air-conditioning systems in buildings. Heat-driven ejector refrigeration systems appear to be a promising alternative to the traditional compressor-based refrigeration technologies for energy consumption reduction. M. Hassanain et al [3] presented in their paper use of a two-phase flow ejector as an expansion device in vapor compression refrigeration systems was one of the efficient ways to enhance its performance. The present work aims to design a constant- area two phase flow ejector and to evaluate performance characteristics of the ejector expansion refrigeration system working with R134a. In order to achieve these objectives, a simulation program was developed and effects of operating conditions and ejector internal efficiencies on the system performance are investigated using EES software. Comparison between present results and published experimental data revealed that the developed model can predict the system COP with a maximum error of 2.3%. The system COP increased by ͺ͹.ͷ% as evaporation temperature changed from −ͳͲ °C to 10 °C. Tao Bai at al [4] presented in their paper an ejector enhanced vapor injection CO2 transcritical heat pump cycle with sub-cooler (ESCVI) for heating application in cold regions was proposed. The thermodynamic analysis using energetic and exegetic methods is carried out to predict the performance characteristics of the ejector enhanced cycle, and then compared with those of the conventional vapor injection heat pump cycle with sub-cooler (SCVI). The simulation results demonstrate that the ejector enhanced cycle exhibits better performance than the conventional vapor injection cycle under the specified operating conditions. The improvements of the maximum system COP and volumetric heating capacity could reach up to 7.7% and 9.5%, respectively. Exergetic analysis indicates that the largest exergy destruction ratio is generated at the compressor followed by the evaporator and gas cooler. Additionally, the exergy efficiency of the ejector is introduced to quantify the effectiveness of the exergy recovery process, which may be a new criterion to evaluate the performance of the ejector enhanced vapor