반사거울 설치 방향 조정에 의한 Heliostat 기구오차에서 기인하는 태양추적오차의 보정
Compensation of Sun Tracking Error caused by the Heliostat Geometrical Error through the Canting of Heliostat Mirror Facets
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초록
Canting is the optical alignment of mirror facets of heliostat such that the heliostat could focus the energy as a unit concentrator. Canting could improve the optical performance of heliostat and thus improves the efficiency of heliostat and ultimately improves the efficiency of the solar thermal power plant. This study discusses the effect of mirror canting, especially off-axis canting, used to compensate the sun tracking error caused by the heliostat geometrical errors. We first show that the canting could compensate the sun tracking error caused by the heliostat geometrical errors. Then we show that the proper canting time could exist, depending on the heliostat location. Finally we show how much the sun tracking performance could be improved by canting, by providing RMS sun tracking error. The limitation and caution of using canting to improve the sun tracking performance are also discussed.
Abstract
Canting is the optical alignment of mirror facets of heliostat such that the heliostat could focus the energy as a unit concentrator. Canting could improve the optical performance of heliostat and thus improves the efficiency of heliostat and ultimately improves the efficiency of the solar thermal power plant. This study discusses the effect of mirror canting, especially off-axis canting, used to compensate the sun tracking error caused by the heliostat geometrical errors. We first show that the canting could compensate the sun tracking error caused by the heliostat geometrical errors. Then we show that the proper canting time could exist, depending on the heliostat location. Finally we show how much the sun tracking performance could be improved by canting, by providing RMS sun tracking error. The limitation and caution of using canting to improve the sun tracking performance are also discussed.
참고문헌 (6)
- Recent Results on the Optical Performance of Solar Two Heliostats, "Jones, S.A.", Sandia National Laboratory, ~, pp.SAND94-2776C (1994)
- Annual Performance Prediction for Off-Axis Aligned Lugo Heliostats at Solar Two, "Jones, S.A.", Sandia National Laboratory, ~, pp.SAND096-0212C (1996)
- PIER:California Energy Commission, "Renewable Energy : Solar two central receiver", ~ (1999)
- Analysis of Solar Two Heliostat Tracking Error Sources, "Stone K.W.", ~, pp.SAND99-0239C (1999)
- 박영칠, "태양광선 궤적추적기법을 이용한 Heliostat 구동축 기구오차에서 기인하는 태양추적오차의 분석", 한국태양에너지학회 논문집, 29(2), pp.39~46 (2009), 한국태양에너지학회
- 박영칠, "Heliostat 반사거울 설치 및 구동기구 유발 오차에 의한 태양추적오차의 해석", 한국태양에너지학회 논문집, 29(3), pp.1~11 (2009), 한국태양에너지학회