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Variable geometry ejectors and their applications in ejector refrigeration systems

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  • Sun, Da-Wen

Abstract

Refrigeration and air-conditioning units powered by low-grade thermal energy have economic advantages. However, the current market is dominated by mechanical vapour-compression systems powered by electrical energy. Ejector-refrigeration cycles offer a low-cost and reliable option for harnessing low-grade thermal energy. Recent studies have shown that variable-geometry ejectors play an important role in achieving optimal performance. Unfortunately, detailed design information on these systems is not in the public domain. Here, we analyse the effect of ejector geometries on performance. Technical data including flow rates, entrainment ratio and ejector geometry are provided for a 5kW steam-jet refrigerator. These data may serve as guides in designing ejector-cycle refrigerators with other cooling capacities.

Suggested Citation

  • Sun, Da-Wen, 1996. "Variable geometry ejectors and their applications in ejector refrigeration systems," Energy, Elsevier, vol. 21(10), pages 919-929.
    • Handle: RePEc:eee:energy:v:21:y:1996:i:10:p:919-929
    DOI: 10.1016/0360-5442(96)00038-2
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    Cited by:

    1. Sun, Fangtian & Fu, Lin & Sun, Jian & Zhang, Shigang, 2014. "A new waste heat district heating system with combined heat and power (CHP) based on ejector heat exchangers and absorption heat pumps," Energy, Elsevier, vol. 69(C), pages 516-524.
    2. Chen, Xiangjie & Omer, Siddig & Worall, Mark & Riffat, Saffa, 2013. "Recent developments in ejector refrigeration technologies," Renewable and Sustainable Energy Reviews, Elsevier, vol. 19(C), pages 629-651.
    3. Besagni, Giorgio & Mereu, Riccardo & Inzoli, Fabio, 2016. "Ejector refrigeration: A comprehensive review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 53(C), pages 373-407.
    4. Sözen, Adnan & Yücesu, H. Serdar, 2007. "Performance improvement of absorption heat transformer," Renewable Energy, Elsevier, vol. 32(2), pages 267-284.
    5. Zhu, Yinhai & Jiang, Peixue, 2014. "Bypass ejector with an annular cavity in the nozzle wall to increase the entrainment: Experimental and numerical validation," Energy, Elsevier, vol. 68(C), pages 174-181.
    6. Wang, Lei & Liu, Jiapeng & Zou, Tao & Du, Jingwei & Jia, Fengze, 2018. "Auto-tuning ejector for refrigeration system," Energy, Elsevier, vol. 161(C), pages 536-543.
    7. Varga, Szabolcs & Oliveira, Armando C. & Palmero-Marrero, Anna & Vrba, Jakub, 2017. "Preliminary experimental results with a solar driven ejector air conditioner in Portugal," Renewable Energy, Elsevier, vol. 109(C), pages 83-92.
    8. Ferrari, M.L. & Pascenti, M. & Massardo, A.F., 2018. "Validated ejector model for hybrid system applications," Energy, Elsevier, vol. 162(C), pages 1106-1114.
    9. Sözen, Adnan & Kurt, Mustafa & Akçayol, M.Ali & Özalp, Mehmet, 2004. "Performance prediction of a solar driven ejector-absorption cycle using fuzzy logic," Renewable Energy, Elsevier, vol. 29(1), pages 53-71.
    10. 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.
    11. Meyer, A.J. & Harms, T.M. & Dobson, R.T., 2009. "Steam jet ejector cooling powered by waste or solar heat," Renewable Energy, Elsevier, vol. 34(1), pages 297-306.
    12. Anand, S. & Gupta, A. & Tyagi, S.K., 2015. "Solar cooling systems for climate change mitigation: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 41(C), pages 143-161.
    13. Sharifi, Navid & Sharifi, Majid, 2014. "Reducing energy consumption of a steam ejector through experimental optimization of the nozzle geometry," Energy, Elsevier, vol. 66(C), pages 860-867.
    14. Luca Viscito & Gianluca Lillo & Giovanni Napoli & Alfonso William Mauro, 2021. "Waste Heat Driven Multi-Ejector Cooling Systems: Optimization of Design at Partial Load; Seasonal Performance and Cost Evaluation," Energies, MDPI, vol. 14(18), pages 1-25, September.
    15. Chunnanond, Kanjanapon & Aphornratana, Satha, 2004. "Ejectors: applications in refrigeration technology," Renewable and Sustainable Energy Reviews, Elsevier, vol. 8(2), pages 129-155, April.
    16. Shan, Yong & Zhang, Jing-zhou & Ren, Xiao-wen, 2018. "Numerical modeling on pumping performance of piccolo-tube multi-nozzles supersonic ejector in an oil radiator passage," Energy, Elsevier, vol. 158(C), pages 216-227.
    17. He, S. & Li, Y. & Wang, R.Z., 2009. "Progress of mathematical modeling on ejectors," Renewable and Sustainable Energy Reviews, Elsevier, vol. 13(8), pages 1760-1780, October.
    18. Liu, Fang & Groll, Eckhard A. & Li, Daqing, 2012. "Investigation on performance of variable geometry ejectors for CO2 refrigeration cycles," Energy, Elsevier, vol. 45(1), pages 829-839.

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