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Performance and Availability of Seawater Distiller with Heat Pipe Utilizing Low-Grade Waste Heat

저급 폐열 이용 히트파이프 해수담수기의 성능과 유용성

  • Park, Chang-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) ;
  • Tanaka, Hiroshi (Department of Mechanical Engineering, Kurume National College of Technology)
  • 박창대 (한국기계연구원 환경에너지기계연구본부) ;
  • 정경열 (한국기계연구원 환경에너지기계연구본부) ;
  • 타나카히로시 (구루메기술국립대학 기계공학부)
  • Received : 2012.05.16
  • Accepted : 2012.11.21
  • Published : 2013.01.01

Abstract

Exhaust gas from a small portable electric generator is simply exhausted to the surroundings because the capacity and quality of the waste heat of this gas is generally not sufficient to recover and utilize. We have proposed a seawater distiller utilizing the thermal energy of waste gas from an electric generator. The distiller recovers heat from the waste gas by means of a heat pipe and uses it effectively through a multiple-effect diffusion-type structure. We constructed an experimental apparatus with a vertical single-effect still having a 4-stroke 50 cc generator engine and found that the experimental results for distillate productivity show good agreement with the theoretical predictions. The results show that the distiller can recover 52 W of waste heat from the gas at $171^{\circ}C$, and ~85% of the recovered heat can be utilized for distillation to produce 70 g/h of fresh water. This is equivalent to a productivity of 500 g/h in the case of a 10-effect still. Therefore, the proposed distiller should be useful in remote areas where electricity and water grids are inadequate.

소형디젤 발전기의 배기가스는 양적 및 질적 수준에서 유용하게 활용되기에는 부족한 폐열원으로 간주된다. 그러나 본 연구에서는 이러한 배기가스의 폐열을 히트파이프에 의해 회수하고 다중효용확산 증발에 의해 효율적으로 열을 이용하는 해수담수기를 제안하였다. 제안한 증류기는 $171^{\circ}C$의 배기가스에서 52 W 의 폐열을 회수할 수 있고, 이 회수 열량 중 약 85%가 약 70 g/h의 담수를 생산할 수 있는 유용한 열량으로 사용된다. 이 결과는 50cc, 4 행정 엔진을 가진 극소형 발전기의 폐열에 대하여 단효용 장치의 실험값이므로, 10 중효용으로 구성할 경우 약 500 g/h 의 성능을 가질 수 있는 것으로 계산되었다. 따라서 본 증류기는 전기와 담수가 동시에 부족한 지역에서 실제 필요한 식수량을 확보할 수 있는 소용량 담수화장치로 유용하게 활용될 수 있다.

Keywords

References

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