Journal of the Korean Institute of Gas (한국가스학회지)

The Korean Institute of GAS (한국가스학회)
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Experimental Study on the Performance Characteristics of a Scroll Expander for 1kW-class Organic Rankine Cycle

1kW급 유기랭킨사이클용 스크롤 팽창기의 성능 특성에 관한 실험적 연구

  • Kim, Dokyun (School of Mechanical Engineering, Pusan National University) ;
  • Yun, Eunkoo (School of Mechanical Engineering, Pusan National University) ;
  • Yoon, Sang Youl (Rolls-Royce University Technology Centre, Pusan National University) ;
  • Kim, Kyung Chun (School of Mechanical Engineering, Pusan National University)
  • 김도균 (부산대학교 기계공학부) ;
  • 윤은구 (부산대학교 기계공학부) ;
  • 윤상열 (롤스로이스 부산대학교 대학기술연구센터) ;
  • 김경천 (부산대학교 기계공학부)
  • Received : 2015.06.30
  • Accepted : 2015.08.26
  • Published : 2015.08.31
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Abstract

The performance characteristics of a scroll expander is the most important variable for the performance of organic Rankine cycle system. In this paper, the performance characteristics of a scroll expander was identified using 1kW class organic Rankine cycle system with various operating conditions. The ORC system is composed of an evaporator, a scroll expander, a condenser and a working fluid feed pump that uses R245fa as working fluid. The hot water temperature was controlled from $80^{\circ}C$ to $115^{\circ}C$ by the 50kW-class electric water-heater. The maximum isentropic efficiency of the scroll expander was measured about 77%, and the shaft power was measured from 0.5 kW to 1.8 kW according to heat source temperatures.

스크롤 팽창기의 성능특성은 유기랭킨사이클 (ORC) 시스템의 성능에 가장 중요한 변수이다. 본 연구에서는 1kW급 ORC 시스템을 구성하여 다양한 작동 조건에서 스크롤 팽창기의 성능특성을 파악하였다. ORC 시스템은 증발기, 스크롤 팽창기, 응축기, 작동유체펌프로 구성되어 있으며, 작동유체로 R245fa를 사용하였다. 고온수 온도는 50kW급 전기히터에 의해 $80^{\circ}C$에서 $115^{\circ}C$까지 제어되었다. 스크롤 팽창기의 최대 등엔트로피 효율은 77%로 측정되었고, ORC 시스템의 축동력은 열원의 온도 조건 및 팽창기의 회전속도에 따라 0.5kW에서 1.8kW까지 측정되었다.

Keywords

References

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