Journal of the Korean Solar Energy Society (한국태양에너지학회 논문집)

The Korean Solar Energy Society (한국태양에너지학회)
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Study on Performance Testing of Concentric Evacuated Tube Solar Energy Collector System

이중진공관형 태양열 집열기의 성능시험에 관한 연구

  • Yoon, Young-Hwan (Dept. of Mechanical Engineering, Changwon National University) ;
  • Kim, Kyung-Hwan (Division of Facilities Management, Changwon National University)
  • Published : 2005.06.30
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Abstract

Concentric evacuated tube solar energy collector has been interested recently since government has driven to install alternative energy systems in new large building. In this paper, testing of the evacuated tube collector is conducted in outdoor during daytime by transient method. The collector thermal efficiencies are plotted in term of $(T_{in}-T_a)/Ic$, where $T_{in}$ is inlet working fluid temperature, $T_a$ is atmospheric temperature and $I_c$ is solar irradiation on the collector surface. The evacuated tube collector efficiency is ranged from 50% to 63% in real outdoor condition. In addition, the total overall heat loss coefficient is found to have an inverse variation to $(T_{in}-T_a)/I_c$ so that the coefficient becomes very high when $(T_{in}-T_a)/I_c$ is small.

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References

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