Performance Characteristics of a Heat Pipe Having Water-Ethanol Mixture as Working Fluid for Evacuated Solar Collectors

물-에탄올 혼합물을 작동유체로 하는 진공관형 태양열 집열기용 히트파이프의 작동특성

  • Jung, Eui-Guk (Graduate School, Korea Aerospace University) ;
  • Boo, Joon-Hong (School of Aerospace and Mechanical Engineering, Korea Aerospace University) ;
  • Kwak, Hee-Youl (Korea Institute of Energy Research(KIER))
  • 정의국 (한국항공대학교 대학원 항공우주 및 기계공학과) ;
  • 부준홍 (한국항공대학교 항공우주 및 기계공학부) ;
  • 곽희열 (한국에너지기술연구원 태양열연구센터)
  • Published : 2008.10.30

Abstract

Heat pipes are considered to be promising candidates to enhance the heat transport capability of evacuated solar collectors in a wide temperature range. The working fluid must be selected properly considering various operating conditions of heat pipes for medium-high temperature range to avoid dry-out, local overheating, and frozen failure. The advantage of using binary mixture as heat pipe working fluid is that it can extend operating temperature range of the system as it can overcome operating temperature limit of a single fluid. Various operating temperature ranges were imposed in the experiments to simulate the actual operation of solar collectors using water-ethanol binary mixture. Tests were conducted for the coolant temperature range of -10$^{\circ}C$ to 120$^{\circ}C$, and mixing ratio range was from 0 to 1 based on mass fraction.

Keywords

References

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