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Study of an ejector-absorption refrigeration cycle with an adaptable ejector nozzle for different working conditions

Author

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  • Vereda, C.
  • Ventas, R.
  • Lecuona, A.
  • Venegas, M.

Abstract

This paper presents a numerical model of an ejector-absorption (single-effect) refrigeration cycle with ammonia–lithium nitrate solution as working fluid, operating under steady-state conditions. In this cycle, the ejector is located at the absorber inlet replacing the solution expansion valve. The liquid–gas ejector entrains refrigerant vapor from the evaporator; this way the absorber pressure becomes higher than the evaporator pressure without any additional energy consumption. The objective of this numerical model is to evaluate the influence of the ejector geometry on the cycle performances and to determine the range of the heat source temperature in which it is convenient to use a practical ejector in the absorption cycle. The simulation is based on UA-ΔTlm models for separate heat transfer regions in a novel implementation using plate-type heat exchangers and this way the results are offered as a function of the external temperatures. This study focuses on evaluating the feasibility of an ejector whose nozzle area is adjustable while the rest of the ejector dimensions are fixed, thus being more feasible than complete variable geometry ejectors. The cycle performance is reported for different mixing tube constant diameters. Results of the simulation show that the use of an ejector allows, among others, to decrease the activation temperature approximately 9°C in respect to the conventional single-effect absorption cycle and increasing the COP for moderate temperatures. The variable ejector nozzle geometry is of profit for optimizing and controlling the cycle.

Suggested Citation

  • Vereda, C. & Ventas, R. & Lecuona, A. & Venegas, M., 2012. "Study of an ejector-absorption refrigeration cycle with an adaptable ejector nozzle for different working conditions," Applied Energy, Elsevier, vol. 97(C), pages 305-312.
  • Handle: RePEc:eee:appene:v:97:y:2012:i:c:p:305-312
    DOI: 10.1016/j.apenergy.2011.12.070
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    References listed on IDEAS

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    1. Wu, Shenyi & Eames, Ian W., 2000. "Innovations in vapour-absorption cycles," Applied Energy, Elsevier, vol. 66(3), pages 251-266, July.
    2. Levy, A. & Jelinek, M. & Borde, I., 2002. "Numerical study on the design parameters of a jet ejector for absorption systems," Applied Energy, Elsevier, vol. 72(2), pages 467-478, June.
    3. Jelinek, M. & Levy, A. & Borde, I., 2002. "Performance of a triple-pressure-level absorption cycle with R125-N,N'-dimethylethylurea," Applied Energy, Elsevier, vol. 71(3), pages 171-189, March.
    4. Shi, Lin & Yin, Juan & Wang, Xin & Zhu, Ming-Shan, 2001. "Study on a new ejection-absorption heat transformer," Applied Energy, Elsevier, vol. 68(2), pages 161-171, February.
    5. Srikhirin, Pongsid & Aphornratana, Satha & Chungpaibulpatana, Supachart, 2001. "A review of absorption refrigeration technologies," Renewable and Sustainable Energy Reviews, Elsevier, vol. 5(4), pages 343-372, December.
    6. Chen, Li-Ting, 1988. "A new ejector-absorber cycle to improve the COP of an absorption refrigeration system," Applied Energy, Elsevier, vol. 30(1), pages 37-51.
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    Citations

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    Cited by:

    1. Ayou, Dereje S. & Bruno, Joan Carles & Coronas, Alberto, 2017. "Integration of a mechanical and thermal compressor booster in combined absorption power and refrigeration cycles," Energy, Elsevier, vol. 135(C), pages 327-341.
    2. Jayasekara, Saliya & Halgamuge, Saman K., 2014. "A combined effect absorption chiller for enhanced performance of combined cooling heating and power systems," Applied Energy, Elsevier, vol. 127(C), pages 239-248.
    3. Haghparast, Payam & Sorin, Mikhail V. & Nesreddine, Hakim, 2018. "The impact of internal ejector working characteristics and geometry on the performance of a refrigeration cycle," Energy, Elsevier, vol. 162(C), pages 728-743.
    4. Frank Bruno & Martin Belusko & Edward Halawa, 2019. "CO 2 Refrigeration and Heat Pump Systems—A Comprehensive Review," Energies, MDPI, vol. 12(15), pages 1-39, August.
    5. Besagni, Giorgio & Mereu, Riccardo & Inzoli, Fabio, 2016. "Ejector refrigeration: A comprehensive review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 53(C), pages 373-407.
    6. Baby-Jean Robert Mungyeko Bisulandu & Rami Mansouri & Adrian Ilinca, 2023. "Diffusion Absorption Refrigeration Systems: An Overview of Thermal Mechanisms and Models," Energies, MDPI, vol. 16(9), pages 1-36, April.
    7. Hamza K. Mukhtar & Saud Ghani, 2021. "Hybrid Ejector-Absorption Refrigeration Systems: A Review," Energies, MDPI, vol. 14(20), pages 1-31, October.
    8. Abed, Azher M. & Alghoul, M.A. & Sopian, K. & Majdi, Hasan Sh. & Al-Shamani, Ali Najah & Muftah, A.F., 2017. "Enhancement aspects of single stage absorption cooling cycle: A detailed review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 77(C), pages 1010-1045.
    9. Jayasekara, Saliya & Halgamuge, Saman K., 2013. "Mathematical modeling and experimental verification of an absorption chiller including three dimensional temperature and concentration distributions," Applied Energy, Elsevier, vol. 106(C), pages 232-242.
    10. Li, Huashan & Cao, Fei & Bu, Xianbiao & Wang, Lingbao & Wang, Xianlong, 2014. "Performance characteristics of R1234yf ejector-expansion refrigeration cycle," Applied Energy, Elsevier, vol. 121(C), pages 96-103.
    11. Garousi Farshi, L. & Mosaffa, A.H. & Infante Ferreira, C.A. & Rosen, M.A., 2014. "Thermodynamic analysis and comparison of combined ejector–absorption and single effect absorption refrigeration systems," Applied Energy, Elsevier, vol. 133(C), pages 335-346.
    12. Kojok, Farah & Fardoun, Farouk & Younes, Rafic & Outbib, Rachid, 2016. "Hybrid cooling systems: A review and an optimized selection scheme," Renewable and Sustainable Energy Reviews, Elsevier, vol. 65(C), pages 57-80.
    13. Sun, Fangtian & Fu, Lin & Sun, Jian & Zhang, Shigang, 2014. "A new ejector heat exchanger based on an ejector heat pump and a water-to-water heat exchanger," Applied Energy, Elsevier, vol. 121(C), pages 245-251.
    14. Zhang, Shaozhi & Luo, Jielin & Wang, Qin & Chen, Guangming, 2018. "Step utilization of energy with ejector in a heat driven freeze drying system," Energy, Elsevier, vol. 164(C), pages 734-744.

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