Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Theoretical Analysis on the Factors Affecting the Power Efficiency of the Kalina Cycle

칼리나 사이클의 발전효율에 영향을 미치는 요소에 관한 이론적 해석

  • Lee, Ki-Woo (Energy Efficiency Research Center, Korea Institute of Energy Research) ;
  • Chun, Won-Pyo (Energy Efficiency Research Center, Korea Institute of Energy Research) ;
  • Shin, Hyeon-Seung (Dept. of A Automotive Mechanical Engineering, Gumi University) ;
  • Park, Byung-Duck (School of Automotive Engineering, Kyungpook National University)
  • 이기우 (한국에너지기술연구원 에너지효율연구단) ;
  • 전원표 (한국에너지기술연구원 에너지효율연구단) ;
  • 신현승 (구미대학교 자동차기계공학과) ;
  • 박병덕 (경북대학교 자동차공학부)
  • Received : 2014.05.13
  • Accepted : 2014.09.11
  • Published : 2014.09.30
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Abstract

This study examined the effects of the key parameters on the power efficiency of the waste heat power plant using the EES program to obtain data for the design of the 20kW Kalina power plant. The parameters include the ammonia mass fraction, vapor pressure, heat source temperature, and the cooling water temperature. According to the analyses, a lower ammonia mass fraction and a higher vapor pressure increase the efficiency, in general. On the other hand, this study shows that there is a specific region with a very low ammonia mass fraction, where the efficiency decreases with ammonia mass fraction. Regarding the vapor pressure at the turbine inlet, the power efficiency increases with increasing vapor pressure. In addition, it was found that the influence of the vapor pressure on the efficiency increases with increasing ammonia mass fraction. Finally, the optimal condition for the maximum power efficiency is defined in this study, i.e., the maximum efficiency was 15% with a 25bar vapor pressure, $160^{\circ}C$ heat source temperature, $10^{\circ}C$ cooling water temperature, and 0.4 ammonia mass fraction.

본 연구에서는 발전용량이 20kW인 폐열회수용 칼리나 발전시스템의 설계 자료를 확보하기 위하여 EES프로그램을 사용하여 해석하였으며, 암모니아농도, 증기압력, 열원온도 및 냉각수온도가 발전효율에 미치는 영향을 분석하였다. 연구결과에서, 암모니아 농도는 낮을수록, 증기압력은 높을수록 발전효율은 증가하였다. 하지만 암모니아 농도가 너무 낮으면 발전효율이 감소하는 영역이 있었다. 터빈입구의 증기압력이 높아지면 발전효율도 높아지며, 암모니아 농도가 높을수록 증기압력의 영향을 더 많이 받는 것으로 나타났다. 최대의 발전효율을 얻기 위한 암모니아 농도, 증기압력, 열원온도 및 냉각수온도 조건이 존재한다는 것을 알 수 있었다. 20kW의 발전시스템에서는 증기압력은 25bar, 열원온도는 $160^{\circ}C$, 냉각수온도가 $10^{\circ}C$일때 암모니아 농도가 0.4에서 발전효율은 최고로 15%까지 가능하였다.

Keywords

References

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