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이중진공관형 태양열 집열기의 하절기 과열 방지에 대한 연구
배상은(Bai Sang-Eun),배철호(Bai Cheol-Ho),남현규(Nam Hyun-Kyu),신기열(Shin Ki-Yeol),유인호(Yoo, In-Ho) 한국태양에너지학회 2013 한국태양에너지학회 논문집 Vol.33 No.3
The reflection plate in twin-glass evacuated tube solar collector is controlled to reduce the overheat during the summer time. The sliding type and folding types are suggested and tested. The sliding type changes the plate angle and the folding type changes the opening angle of the reflection plate. By scattering the focus of the reflected radiation from the reflection plate, the temperature rise of the working fluid can be reduced. The sliding type shows the best results in overheat reduction. When solar radiation is 900W/m², the temperature rise in one sliding type collector is reduced about 2℃ compared to that of the normal solar collector. When this method is applied to seven series-collectors in the field, the reduction of temperature rise during the summer time should be significant.