R152a and R134a: High-Performance Working Fluids for Ejector Cooling Systems
Published online: 29/09/2025
Corressponding author's email:
nguyenvanvu@hcmute.edu.vnDOI:
https://doi.org/10.54644/jte.2025.1915Keywords:
R600a, HFOs, Ejector refrigeration, EES, R152aAbstract
This study presents a comprehensive thermodynamic analysis of an ejector cooling system (ECS) using a detailed one-dimensional mathematical model implemented in Engineering Equation Solver (EES) software. The research investigates the impact of key operational parameters such as secondary flow superheating, generator temperature, and primary nozzle superheat on system performance, specifically the entrainment ratio (ER) and coefficient of performance (COP). A comparative assessment of five working fluids (R134a, R152a, R600a, R1234ze(E), and R1233zd(E)) was conducted. Results indicate that secondary flow superheating generally enhances COP with minimal ER impact, while increased generator temperature improves both ER and COP. Primary nozzle superheat proved critical for overall performance. Among the investigated refrigerants, R134a and R152a demonstrated the highest COP. Notably, the low-GWP refrigerants R600a and R1234ze(E) showed promising and competitive performance, highlighting their potential as environmentally friendlier alternatives in heat-driven ejector cooling applications. The developed model serves as a robust tool for designing and analyzing ejector cooling systems.
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References
G. Happle, E. Wilhelm, J. A. Fonseca, and A. Schlueter, "Determining air-conditioning usage patterns in Singapore from distributed, portable sensors," Energy Procedia, vol. 122, pp. 313–318, Sep. 2017, doi: 10.1016/j.egypro.2017.07.328.
OECD/IEA, The Future of Cooling: Opportunities for Energy-Efficient Air Conditioning, Paris, France: IEA, 2018.
V. Mohan, "India’s share in global air conditioning units to jump from 2.2% to almost 25% by 2050." [Online]. Available: https://economictimes.indiatimes.com/news/environment/global-warming/indias-share-in-global-air-conditioning-units-to-jump-from-2-2-to-almost-25-by-2050/articleshow/66595350.cms
R. Roman and J. I. Hernandez, "Performance of ejector cooling systems using low ecological impact refrigerants," Int. J. Refrig., vol. 34, no. 7, pp. 1707–1716, 2011, doi: 10.1016/j.ijrefrig.2011.03.006.
G. Besagni, R. Mereu, G. Di Leo, and F. Inzoli, "A study of working fluids for heat driven ejector refrigeration using lumped parameter models," Int. J. Refrig., vol. 58, pp. 154–171, 2015, doi: 10.1016/j.ijrefrig.2015.06.015.
G. Besagni, R. Mereu, and F. Inzoli, "Ejector refrigeration: A comprehensive review," Renew. Sustain. Energy Rev., vol. 53, pp. 373–407, Jan. 2016, doi: 10.1016/j.rser.2015.08.059.
Y. L. Li et al., "Investigation on the effect of ejector liquid recirculation system on the performance of falling-film water chiller with R134a," Int. J. Refrig., vol. 74, pp. 333–344, 2017, doi: 10.1016/j.ijrefrig.2016.11.009.
J. Yan et al., "Experimental study on key geometric parameters of an R134A ejector cooling system," Int. J. Refrig., vol. 67, pp. 102–108, 2016, doi: 10.1016/j.ijrefrig.2016.04.001.
J. Yan, W. Cai, and Y. Li, "Geometry parameters effect for air-cooled ejector cooling systems with R134a refrigerant," Renew. Energy, vol. 46, pp. 155–163, 2012, doi: 10.1016/j.renene.2012.03.031.
J. Yu, Y. Ren, H. Chen, and Y. Li, "Applying mechanical subcooling to ejector refrigeration cycle for improving the coefficient of performance," Energy Convers. Manag., vol. 48, no. 4, pp. 1193–1199, 2007, doi: 10.1016/j.enconman.2006.10.009.
The European Parliament, "Regulation (EU) no 517/2014 of the European Parliament and of the Council," 2014. [Online]. Available: https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX%3A32014R0517
S. Varga, P. M. S. Lebre, and A. C. Oliveira, "CFD study of a variable area ratio ejector using R600a and R152a refrigerants," Int. J. Refrig., vol. 36, no. 1, pp. 157–165, Jan. 2013, doi: 10.1016/j.ijrefrig.2012.10.016.
J. Dong et al., "An experimental investigation of steam ejector refrigeration system powered by extra low temperature heat source," Int. Commun. Heat Mass Transf., vol. 81, pp. 250–256, 2017, doi: 10.1016/j.icheatmasstransfer.2016.12.022.
S. Varga et al., "Preliminary experimental results with a solar driven ejector air conditioner in Portugal," Renew. Energy, vol. 109, pp. 83–92, Aug. 2017, doi: 10.1016/j.renene.2017.03.016.
P. R. Pereira et al., "Experimental results with a variable geometry ejector using R600a as working fluid," Int. J. Refrig., vol. 46, pp. 77–85, Oct. 2014, doi: 10.1016/j.ijrefrig.2014.06.016.
N. Al-Khalidy, "An experimental study of an ejector cycle refrigeration machine operating on R113," Int. J. Refrig., vol. 21, no. 8, pp. 617–625, Dec. 1998, doi: 10.1016/S0140-7007(98)00030-9.
Y. Jia and C. Wenjian, "Area ratio effects to the performance of air-cooled ejector refrigeration cycle with R134a refrigerant," Energy Convers. Manag., vol. 53, no. 1, pp. 240–246, 2012, doi: 10.1016/j.enconman.2011.09.002.
K. O. Shestopalov et al., "Investigation of an experimental ejector refrigeration machine operating with refrigerant R245fa at design and off-design working conditions. Part 2. Theoretical and experimental results," Int. J. Refrig., vol. 55, pp. 212–223, 2015, doi: 10.1016/j.ijrefrig.2015.02.004.
B. J. Huang et al., "A solar ejector cooling system using refrigerant R141b," Sol. Energy, vol. 64, no. 4–6, pp. 223–226, 1998, doi: 10.1016/S0038-092X(98)00082-6.
S. Klein and G. Nellis, Mastering EES, 2018.
P. R. Pereira et al., "Experimental results with a variable geometry ejector using R600a as working fluid," Int. J. Refrig., vol. 46, pp. 77–85, Oct. 2014, doi: 10.1016/j.ijrefrig.2014.06.016.
V. V. Nguyen et al., "Applying a variable geometry ejector in a solar ejector refrigeration system," Int. J. Refrig., vol. 113, pp. 187–195, May 2020, doi: 10.1016/j.ijrefrig.2020.01.018.
J. T. Munday and D. F. Bagster, "A new ejector theory applied to steam jet refrigeration," Ind. Eng. Chem. Process Des. Dev., vol. 16, no. 4, pp. 442–449, Oct. 1977, doi: 10.1021/i260064a003.
J. Yu, H. Zhao, and Y. Li, "Application of an ejector in autocascade refrigeration cycle for the performance improvement," Int. J. Refrig., vol. 31, no. 2, pp. 279–286, Mar. 2008, doi: 10.1016/j.ijrefrig.2007.05.008.
J. Kracik, V. Dvorak, V. V. Nguyen, and K. Smierciew, "Experimental and numerical study on supersonic ejectors working with R-1234ze(E)," EPJ Web Conf., vol. 180, p. 02047, 2018, doi: 10.1051/epjconf/201818002047.
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