이중진공관형 태양열 집열기의 성능시험에 관한 연구
Study on Performance Testing of Concentric Evacuated Tube Solar Energy Collector System
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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 (Tin-Ta)/Ic, where Tin is inlet working fluid temperature, Ta is atmospheric temperature and Ic 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 (Tin-Ta)/Ic so that the coefficient becomes very high when (Tin-Ta)/Ic is small.
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