A study on reducing temperature rise of twin-glass evacuated tube solar collector during summer time

Title & Authors
A study on reducing temperature rise of twin-glass evacuated tube solar collector during summer time
Bai, Sang-Eun; Bai, Cheol-Ho; Nam, Hyun-Kyu; Shin, Ki-Yeol; Yoo, In-Ho;

Abstract
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 900 $\small{W/m^2}$, the temperature rise in one sliding type collector is reduced about $\small{2^{\circ}C}$ 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.
Keywords
Twin-glass evacuated tube solar collector;Folding type;Over heat;Sliding type;
Language
Korean
Cited by
1.
태양열 집열관 과열방지를 위한 지중열교환기 연구,황현창;;이계복;이석호;

한국산학기술학회논문지, 2016. vol.17. 7, pp.616-622
1.
A study of geothermal heat dump for solar collectors overheat protection, Journal of the Korea Academia-Industrial cooperation Society, 2016, 17, 7, 616
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