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

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Effects of Channel Amplitude Ratio on Flow and Heat Transfer Characteristics of Primary Surface Heat Exchanger for ORC

유기 랭킨 사이클용 스크롤 팽창기 성능 시험에 관한 연구

  • Moon, Je-Hyeon (Department of Mechanical System Engineering, Incheon National University) ;
  • Park, Keun-Tae (Department of Mechanical System Engineering, Incheon National University) ;
  • Kim, Hyun-Jin (Department of Mechanical System Engineering, Incheon National University)
  • 문제현 (인천대학교 기계시스템공학부) ;
  • 박근태 (인천대학교 기계시스템공학부) ;
  • 김현진 (인천대학교 기계시스템공학부)
  • Received : 2013.12.23
  • Accepted : 2014.02.17
  • Published : 2014.04.10
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Abstract

An algebraic scroll expander has been fabricated and tested in a R134a Rankine cycle with heat source of 20 kW. For the operating conditions of 20~26 bar and $90{\sim}93^{\circ}C$ at the expander inlet and 8~9 bar at the outlet, the expander produced the shaft output power of about 0.6~0.7 kW in the operating speed range of 1500~2000 rpm. These correspond to the expander efficiency of 40~45%. The volumetric efficiency increased with increasing of the expander speed, reaching to 80% at 2000 rpm. Comparing to numerical simulation results, mechanical efficiency from the test data was found to be considerably low by as much as 30%, indicating that reduction in the frictional loss should be made to improve the scroll expander efficiency.

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References

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