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Effects of design conditions and irreversibilities on the dimensions of ejectors in refrigeration systems

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  • Khennich, Mohammed
  • Galanis, Nicolas
  • Sorin, Mikhail

Abstract

A thermodynamic model for the design of ejectors is described, validated and applied for conditions prevailing in refrigeration systems. Contrary to previous models the present one determines all the dimensions of the ejector and uses polytropic (instead of isentropic) efficiencies thus taking into account the effects of the pressure ratio on the entropy increase during the irreversible acceleration and deceleration processes. The results include dimensions and fluid properties for a base case as well as a parametric study which analyzes the effect of inlet and outlet conditions on the dimensions and efficiencies of the acceleration, deceleration and mixing processes. The parametric study coupled to recommended constraints from the literature leads to the determination of design conditions for which the axial evolution of pressure, temperature and velocity are determined. The effects of the polytropic efficiency on the ejector dimensions and the efficiencies of the processes taking place in the ejector are also presented and analysed. It is also shown that the total exergy losses increase linearly when the mixing efficiency decreases.

Suggested Citation

  • Khennich, Mohammed & Galanis, Nicolas & Sorin, Mikhail, 2016. "Effects of design conditions and irreversibilities on the dimensions of ejectors in refrigeration systems," Applied Energy, Elsevier, vol. 179(C), pages 1020-1031.
    • Handle: RePEc:eee:appene:v:179:y:2016:i:c:p:1020-1031
    DOI: 10.1016/j.apenergy.2016.07.053
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    References listed on IDEAS

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    Cited by:

    1. Jeon, Yongseok & Kim, Sunjae & Kim, Dongwoo & Chung, Hyun Joon & Kim, Yongchan, 2017. "Performance characteristics of an R600a household refrigeration cycle with a modified two-phase ejector for various ejector geometries and operating conditions," Applied Energy, Elsevier, vol. 205(C), pages 1059-1067.
    2. 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.
    3. Mohammed Khennich & Mikhail Sorin & Nicolas Galanis, 2016. "Exergy Flows inside a One Phase Ejector for Refrigeration Systems," Energies, MDPI, vol. 9(3), pages 1-10, March.
    4. Bartosz Gil & Jacek Kasperski, 2018. "Efficiency Evaluation of the Ejector Cooling Cycle using a New Generation of HFO/HCFO Refrigerant as a R134a Replacement," Energies, MDPI, vol. 11(8), pages 1-17, August.
    5. Zhang, Sheng & Cheng, Yong, 2017. "Performance improvement of an ejector cooling system with thermal pumping effect (ECSTPE) by doubling evacuation chambers in parallel," Applied Energy, Elsevier, vol. 187(C), pages 675-688.
    6. Jeon, Yongseok & Jung, Jongho & Kim, Dongwoo & Kim, Sunjae & Kim, Yongchan, 2017. "Effects of ejector geometries on performance of ejector-expansion R410A air conditioner considering cooling seasonal performance factor," Applied Energy, Elsevier, vol. 205(C), pages 761-768.
    7. Jeon, Yongseok & Kim, Sunjae & Lee, Sang Hun & Chung, Hyun Joon & Kim, Yongchan, 2020. "Seasonal energy performance characteristics of novel ejector-expansion air conditioners with low-GWP refrigerants," Applied Energy, Elsevier, vol. 278(C).
    8. Tashtoush, Bourhan M. & Al-Nimr, Moh'd A. & Khasawneh, Mohammad A., 2017. "Investigation of the use of nano-refrigerants to enhance the performance of an ejector refrigeration system," Applied Energy, Elsevier, vol. 206(C), pages 1446-1463.

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