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Performance characteristics of an R600a household refrigeration cycle with a modified two-phase ejector for various ejector geometries and operating conditions

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  • Jeon, Yongseok
  • Kim, Sunjae
  • Kim, Dongwoo
  • Chung, Hyun Joon
  • Kim, Yongchan

Abstract

Even though a condenser outlet split (COS) ejector cycle offers several advantages over a standard two-phase ejector cycle, few experimental investigations on the performance of the COS ejector cycle are available in the literature. The objective of this study is to investigate the effects of the various ejector geometries on the performance of a small-sized household refrigeration cycle by using the refrigerant R600a under various operating conditions. The performance of the COS ejector cycle was measured and analyzed by varying the compressor speed, entrainment ratio (ER), nozzle position, and mixing section diameter. The enhancement in COP of the COS ejector cycle over that of the baseline cycle increased with the decrease in ER and increase in compressor speed, owing to the reduction in expansion loss. At a compressor speed of 45Hz and an ER of 0.3, the maximum COP improvement of the COS ejector cycle with the optimum mixing section diameter over that of the baseline cycle was 6.8%. In addition, the optimum mixing section diameter for a given ER and compressor speed was proposed.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:appene:v:205:y:2017:i:c:p:1059-1067
    DOI: 10.1016/j.apenergy.2017.08.148
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    Cited by:

    1. Tang, Yongzhi & Liu, Zhongliang & Shi, Can & Li, Yanxia, 2018. "A novel steam ejector with pressure regulation to optimize the entrained flow passage for performance improvement in MED-TVC desalination system," Energy, Elsevier, vol. 158(C), pages 305-316.
    2. Braimakis, Konstantinos, 2021. "Solar ejector cooling systems: A review," Renewable Energy, Elsevier, vol. 164(C), pages 566-602.
    3. Gao, Yu & He, Guogeng & Cai, Dehua & Fan, Mingjing, 2020. "Performance evaluation of a modified R290 dual-evaporator refrigeration cycle using two-phase ejector as expansion device," Energy, Elsevier, vol. 212(C).
    4. Jeon, Yongseok & Kim, Dongwoo & Jung, Jongho & Jang, Dong Soo & Kim, Yongchan, 2018. "Comparative performance evaluation of conventional and condenser outlet split ejector-based domestic refrigerator-freezers using R600a," Energy, Elsevier, vol. 161(C), pages 1085-1095.
    5. Han, Yu & Wang, Xiaodong & Sun, Hao & Zhang, Guangli & Guo, Lixin & Tu, Jiyuan, 2019. "CFD simulation on the boundary layer separation in the steam ejector and its influence on the pumping performance," Energy, Elsevier, vol. 167(C), pages 469-483.
    6. 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).
    7. Liu, Ye & Yu, Jianlin, 2018. "Performance analysis of an advanced ejector-expansion autocascade refrigeration cycle," Energy, Elsevier, vol. 165(PB), pages 859-867.
    8. Yongseok Jeon & Hoon Kim & Jae Hwan Ahn & Sanghoon Kim, 2020. "Effects of Nozzle Exit Position on Condenser Outlet Split Ejector-Based R600a Household Refrigeration Cycle," Energies, MDPI, vol. 13(19), pages 1-12, October.
    9. Tashtoush, Bourhan M. & Al-Nimr, Moh'd A. & Khasawneh, Mohammad A., 2019. "A comprehensive review of ejector design, performance, and applications," Applied Energy, Elsevier, vol. 240(C), pages 138-172.
    10. 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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