이중진공관형 태양열 집열기의 하절기 과열 방지에 대한 연구
A study on reducing temperature rise of twin-glass evacuated tube solar collector during summer time
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초록
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/m2, the temperature rise in one sliding type collector is reduced about 2oC 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.
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/m2, the temperature rise in one sliding type collector is reduced about 2oC 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.
참고문헌 (7)
- 서태범, "고성능 이중진공 유리관 태양열 집열기의 개발", 설비공학논문집, 2(3), pp.16~22 (2008)
- Lin, Q., "Solar heating systems with evacuated tubular solar collector", In Proc. of the Eurosun ’98 Conf (1998)
- 이동원, "태양열시스템의 개요 및 현황", 설비저널, 40(5), pp.5~11 (2011)
- Yun, S. E., "Numerical study of thermal performance of the sun tracking evacuated CPC collector", Proceedings of the SAREK Winter Annual Conference, pp.445~450 (2004)
- Kim, J-M., "Study of solar radiation of fixed and tracking solar collectors for various locations in Korea", Proceedings of the SAREK Summer Annual Conference, pp.949~954 (2007)
- Cho, Y., "A study of optimum slope angles of fixed and azimuth tracking solar collectors by region, period and year", Proceedings of the SAREK Summer Annual Conference, pp.1012~1017 (2010)
- Abdallah, S., "Two axes sun tracking system with PLC control", Energy conversion and Management, 45, pp.1931~1939 (2003)