Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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One-dimensional Numerical Analysis of the Effect of Seawater Feed Rate on Multi-effect Solar Stills

태양열 담수기 다중효용부의 해수 공급유량에 관한 1차원 수치해석

  • Lim, Byung-Ju (Environment and Energy Systems Research Division, Korea Institute of Machinery and Materials) ;
  • Yu, Sang-Seok (School of Mechanical Engineering, ChungNam Nat'l Univ.) ;
  • Park, Change-Dae (Environment and Energy Systems Research Division, Korea Institute of Machinery and Materials) ;
  • Chung, Kyung-Yul (Environment and Energy Systems Research Division, Korea Institute of Machinery and Materials)
  • 임병주 (한국기계연구원 환경에너지기계연구본부) ;
  • 유상석 (충남대학교 기계공학부) ;
  • 박창대 (한국기계연구원 환경에너지기계연구본부) ;
  • 정경열 (한국기계연구원 환경에너지기계연구본부)
  • Received : 2016.01.28
  • Accepted : 2016.05.23
  • Published : 2016.07.01
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Abstract

In a multi-effect solar distiller, a feeding rate of seawater to each effect should be decreased as the effect number is increased. In previous studies, the feed rate of seawater was not reduced evenly between the effects, which is unreasonable, since the thermal energy input of each effect decreases by the same amount. In this work, numerical analysis was carried out in order to elucidate this discrepancy. The results showed that the amount of distillates produced was almost the same for both evenly and unevenly reduced flow rates between the effects. Optimum feed rates of seawater with various energy inputs from exhaust gas heat exchanger were also obtained. The results showed that the optimum feed rate of the first effect increased linearly or reached a steady state depending on the heat flux.

다중효용 태양열 담수기에서 다중효용부 각 효용단의 해수 공급유량은 효용수 증가에 따른 열에너지 감소를 고려하여 점차 줄어드는데, 선행연구에서는 효용단 별 서로 다른 공급유량 감소율을 제시하였다. 이론적으로 열에너지 감소율이 일정하기 때문에 효용단 별 서로 다른 유량감소율은 적절하지 않다. 본 논문에서는 수치해석을 통해 다중효용부의 공급유량 감소율에 따른 담수생산량 특성을 분석하였다. 해석결과 공급에너지가 같은 조건(12MJ)에서 동일한 감소율(11%)일 때와 그렇지 않을 때의 생산량 차이는 0.56%로 거의 비슷하였다. 또한 수치해석을 통해 고온의 배기가스로부터 얻은 공급 에너지량에 따라 다중효용부 해수공급유량의 최적값을 도출하였다. 최적 유량은 에너지의 공급 형태에 따라 선형적으로 증가하거나 증가 후 평형상태에 도달하는 현상이 발생하였다.

Keywords

Acknowledgement

Supported by : 한국에너지기술평가원

References

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