Performance analysis of dual-evaporator ejector refrigeration system in different configurations: Experimental investigation

Abstract

This study aimed to assess the effectiveness of an ejector refrigeration cycle, using a laboratory-scale experimental system operating in different configurations. The investigated configurations consisted of a conventional vapour compression refrigeration (CVCR) system and a dual evaporator ejector system (DEES) operated in two modes: DEES with a single thermal expansion valve (DEESA) and DEES with dual thermal expansion valves (DEESB). The findings revealed that the utilization of the ejector enhanced the refrigerant's mass flow rate. Additionally, the DEESA configuration achieved higher cooling capacities compared to the CVCR. Moreover, the DEESA configuration achieved up to 21% higher coefficient of performance (COP) values. On the other hand, when the system was operated in the DEESB configuration, it yielded lower evaporation temperatures and higher superheating degrees in comparison to DEESA. Based on the evaluations, it can be concluded that the ejector operates more efficiently in systems with dual evaporators, thereby making positive contributions to overall system performance.

Keywords

• Ejector
• TXV
• COP
• Dual Evaporator

References

1. L. DJ. The Role of Refrigeration in the Global Economy (2019), 38th Note on Refrigeration Technologies. International Institute of Refrigeration, France, Paris, 2019.
2. Direk M, Soylu E. The effect of internal heat exchanger using R1234ze(E) as an alternative refrigerant in a mobile air-conditioning system. Journal of Mechanical Engineering 2018;64:114-120.
3. Erdinc MT. Two-evaporator refrigeration system integrated with expander-compressor booster. International Journal of Refrigeration 2023; 0140-7007.
4. Erdinc MT. Performance simulation of expander-compressor boosted subcooling refrigeration system. International Journal of Refrigeration 2023;149:237-247.
5. Prabakaran R, Lal DM, Kim SC. A state of art review on future low global warming potential refrigerants and performance augmentation methods for vapour compression based mobile air conditioning system. Journal of Thermal Analysis and Calorimetry 2023;148:417-449.
6. Caliskan O, Ersoy HK. Energy analysis and performance comparison of transcritical CO2 supermarket refrigeration cycles. The Journal of Supercritical Fluids 2022;189:105698.
7. Oshitani H, Yamanaka Y, et al. Vapor Compression Cycle Having Ejector. United States Patent 2007; Patent No. US007254961B2.
8. Lawrence N, Elbel S. Experimental investigation of a two-phase ejector cycle suitable for use with low-pressure refrigerants R134a and R1234yf. International Journal of Refrigeration 2014;38:310-322.

9. Kim S, Jeon Y, Chung HJ, Kim Y. Performance optimization of an R410A air-conditioner with a dual evaporator ejector cycle based on cooling seasonal performance factor. Applied Thermal Engineering 2018;131:988-997.
10. Bilir Sag N, Ersoy HK, Hepbasli A, Halkaci HS. Energetic and exergetic comparison of basic and ejector expander refrigeration systems operating under the same external conditions and cooling capacities. Energy Conversion and Management 2015;90:184-194.
11. Ünal Ş, Yilmaz T. Thermodynamic analysis of the two-phase ejector air-conditioning system for buses. Applied Thermal Engineering 2015;79:108–116.
12. Wang X, Yu J, Xing M. Performance analysis of a new ejector enhanced vapor injection heat pump cycle. Energy Conversion and Management 2015;100:242-248.
13. Geng L, Liu H, Wei X, Hou Z, Wang Z. Energy and exergy analyses of a bi-evaporator compression/ejection refrigeration cycle. Energy Convers Manag 2016;130:71-80.
14. Expósito Carrillo JA, Sánchez de La Flor FJ, Salmerón Lissén JM. Thermodynamic comparison of ejector cooling cycles. Ejector characterisation by means of entrainment ratio and compression efficiency. International Journal of Refrigeration 2017;74:371-384.
15. Gao Y, He G, Cai D, Fan M. Performance evaluation of a modified R290 dual-evaporator refrigeration cycle using two-phase ejector as expansion device. Energy 2020;212.
16. Liu J, Liu Y, Yu J. Performance analysis of a modified dual-ejector and dual-evaporator transcritical CO2 refrigeration cycle for supermarket application. International Journal of Refrigeration 2021;131:109–118.
17. Direk M, İşkan Ü, Tunçkal C, Mert MS, Yüksel F. An experimental investigation of ejector employed a dual-evaporator vapor compression refrigeration system under various entrainment ratios using R134a as the refrigerant. Sustainable Energy Technologies and Assessments 2022;52:102293.
18. Alkhulaifi YM, Qasem NAA, Zubair SM. Exergoeconomic assessment of the ejector-based battery thermal management system for electric and hybrid-electric vehicles. Energy 2022;245:123252.
19. Ünal Ş, Erdinç MT, Akgün H, Bilgili M. Effects of alternative refrigerants on the ejector dimensions for single and dual ejectors enhanced bus air conditioning system. International Communications in Heat and Mass Transfer 2023;143:106685.
20. Direk M, İşkan Ü, Üğüdür B, Kahraman MC. Experimental performance analysis of ejector heat pump water heater under transient conditions. Sci Technol Built Environ 2023;29:523-532.
21. Tahir Erdinc M, Kutlu C, Unal S, Aydin O, Su Y, Riffat S. Performance improvement potential of a PV/T integrated dual-source heat pump unit with a pressure booster ejector. Thermal Science and Engineering Progress 2023;37:101534.
22. İşkan Ü, Di̇rek M. Experimental performance evaluation of the dual-evaporator ejector refrigeration system using environmentally friendly refrigerants of R1234ze(E), ND, R515a, R456a, and R516a as a replacement for R134a. J Clean Prod 2022;352:131612.
23. İşkan Ü, Üğüdür B, Kahraman MC, Direk M, Tunçkal C. Evaluation of the impact of the temperature and mass flow rate of the water, utilized in the R516A refrigeration system with dual evaporator and ejector, on the performance parameters. Energy Sources, Part A: Recovery, Utilization, and Environmental Effects 2022; 44:7316-7329.