New & Renewable Energy (신재생에너지)

Korean Society for New and Renewable Energy (한국신·재생에너지학회)
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Optimal Operating Points on the Organic Rankine Cycle to Efficiently Regenerate Renewable Fluctuating Heat Sources

신재생에너지 가변열원의 효율적 이용을 위한 유기랭킨 사이클 최적작동점에 관한 연구

  • 조수용 (경상대학교 항공기부품기술연구센터, 항공공학과) ;
  • 조종현 ((주)선테크 기술연구소)
  • Received : 2013.11.14
  • Accepted : 2014.03.11
  • Published : 2014.03.25
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Abstract

Organic Rankine cycle (ORC) has been widely used to convert renewable energy such as solar energy, geothermal energy, or waste energy etc., to electric power. For a small scale output power less than 10 kW, turbo-expander is not widely used than positive displacement expander. However, the turbo-expander has merits that it can operate well at off-design points. Usually, the available thermal energy for a small scale ORC is not supplied continuously. So, the mass flowrate should be adjusted in the expander to maintain the cycle. In this study, nozzles was adopted as stator to control the mass flowrate, and radial-type turbine was used as expander. The turbine operated at partial admission. R245fa was adopted as working fluid, and supersonic nozzle was designed to get the supersonic flow at the nozzle exit. When the inlet operating condition of the working fluid was varied corresponding to the fluctuation of the available thermal energy, optimal operating condition was investigated at off-design due to the variation of mass flowrate.

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