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

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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A Study on the Design of an Asymmetric Algebraic Scroll Expander

비대칭 대수나선 스크롤 팽창기 설계에 관한 연구

  • Kim, Hyun-Jin (Department of Mechanical System Engineering, Incheon National University) ;
  • Moon, Je-Hyeon (Department of Mechanical System Engineering, Incheon National University) ;
  • Lee, Young-Sung (Department of Mechanical System Engineering, Incheon National University)
  • 김현진 (인천대학교 기계 시스템 공학부) ;
  • 문제현 (인천대학교 기계 시스템 공학부) ;
  • 이영성 (인천대학교 기계 시스템 공학부)
  • Received : 2013.12.23
  • Accepted : 2014.02.17
  • Published : 2014.03.10
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Abstract

In order to extract shaft power from thermal energy in a R134a Rankine cycle as waste heat recovery system of a passenger car, a scroll expander has been designed. Algebraic spiral is adopted as the base curve for scroll wrap profile in the compact scroll design. About 19% reduction in scroll diameter is accomplished when compared to the conventional involute scroll. Performance analysis on the designed scroll expander shows that the expander efficiency is 85.5% at the vehicle speed of 120 km/hr and it decreases to 67.2% at 60 km/hr, provided that the scroll clearance is kept at 10 ${\mu}m$. The expander can produce shaft power equivalent to about 13~14% of the driving power within the speed range of 60~120 km/hr.

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References

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