Journal of the Korean Solar Energy Society (한국태양에너지학회 논문집)

The Korean Solar Energy Society (한국태양에너지학회)
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A study on reducing temperature rise of twin-glass evacuated tube solar collector during summer time

이중진공관형 태양열 집열기의 하절기 과열 방지에 대한 연구

  • Bai, Sang-Eun (Department of Architecture Engineering, Yeungnam University) ;
  • Bai, Cheol-Ho (Department of Architecture Engineering, Yeungnam University) ;
  • Nam, Hyun-Kyu (Department of Architecture Engineering, Yeungnam University) ;
  • Shin, Ki-Yeol (Department of CAD/CAM, Daugu Future College) ;
  • Yoo, In-Ho (Sehan Energy Co., Ltd.)
  • Received : 2013.01.18
  • Accepted : 2013.04.22
  • Published : 2013.06.30
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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 $W/m^2$, the temperature rise in one sliding type collector is reduced about $2^{\circ}C$ 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

References

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