Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Experimental Analysis on the Performance Characteristics of an Ejector according to Inlet Pressure and Nozzle Position

운전조건 및 노즐위치에 따른 이젝터 성능특성에 관한 실험적 연구

  • Lee, Jae Jun (Graduate School of Mechanical Engineering Korea University) ;
  • Jeon, Yongseok (Graduate School of Mechanical Engineering Korea University) ;
  • Kim, Sun Jae (Graduate School of Mechanical Engineering Korea University) ;
  • Kim, Yongchan (Department of Mechanical Engineering, Korea University)
  • 이재준 (고려대학교 기계공학부 대학원) ;
  • 전용석 (고려대학교 기계공학부 대학원) ;
  • 김선재 (고려대학교 기계공학부 대학원) ;
  • 김용찬 (고려대학교 기계공학부)
  • Received : 2014.10.21
  • Accepted : 2015.03.16
  • Published : 2015.05.10
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Abstract

In this study, the performance of an ejector in the refrigeration cycle was experimentally studied using R600a. The performance of the ejector is analyzed according to the inlet pressure and nozzle position. The increase in the primary nozzle pressure decreased the pressure difference across the ejector. In the low entrainment region, the increased suction flow pressure led to an increase in the pressure difference. In the high entrainment region, the pressure difference was inversely proportional to the suction pressure. The effects of nozzle position ($L_n$) were also analyzed and for $L_n<0$, the decreased suction chamber volume led to a large pressure drop with the small increase in the suction mass flow rate. For $L_n>0$, the increased $L_n$ disturbed the primary nozzle flow and thus an increase in the primary nozzle flow increased the pressure lifting effect. In contrast, the increased suction mass flow rate decreased the pressure difference. When the nozzle outlet was located at the mixing part entrance ($L_n=0$), the ejector showed the highest pressure lifting effect.

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References

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