ESTIMATION METHOD OF DIRECT AND DIFFUSE SOLAR IRRADIANCE CONSIDERING THE SKY RADIANCE DISTRIBUTION

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  • NAKAYAMA Satoshi
    Dept. of Architecture, Graduate School of Engineering, Tokyo Metropolitan University
  • ISHINO Hisaya
    Dept. of Architecture, Graduate School of Engineering, Tokyo Metropolitan University

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  • 天空放射輝度分布を考慮した直達・拡散日射の推定法に関する研究
  • テンクウ ホウシャ キド ブンプ オ コウリョ シタ チョクタツ カクサン ニッシャ ノ スイテイホウ ニ カンスル ケンキュウ

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The sky radiance distribution changes in accordance with the sky condition, such as solar position, weather, cloud conditions and so on. This paper proposes a method of dividing the global solar irradiance into the direct diffuse irradiance, and this method is based on the data of the sky radiance distribution measured by Sky Scanner. The proposed solar irradiance model : Δζ-based Sky Irradiance Model, is that irradiance from the high-radiant area around the sun is added to the direct solar irradiance value. Δζ is the angle distance from the center of the sun to the end of direct irradiance area. From the results of study on solar irradiance on tilted surfaces, Δζ value is recommended 50 degree. In this paper, we propose the equations that estimate the Δζ-Based Sky Irradiance from the global solar irradiance, and verified its accuracy.

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