長期観測データに基づく日射の直散分離に関する実証的研究

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タイトル別名
  • A STUDY ON DIRECT AND DIFFUSE SOLAR IRRADIANCE FROM MEASURED GLOBAL HORIZONTAL SOLAR IRRADIANCE BASED ON LONG-TERM OBSERVATION DATA
  • チョウキ カンソク データ ニ モトヅク ニッシャ ノ チョクサンブンリ ニ カンスル ジッショウテキ ケンキュウ

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As an observatory of the International Daylight Measurement Programme (IDMP) of the Commission Internationale de l'Eclairage (CIE), one of the authors started measurement at Chofu-city in January 1993. Based on minutely data gathered over the past seven years on solar irradiance, temperature and humidity, this paper proposed the estimation formula I with direct and diffuse irradiance from measured global irradiance. Formula I estimates the cloud ratio in view of clearness index alone. Comparison between Formula l and conventional five formulas for estimation on direct and diffuse solar irradiance out of Group P, which serves as a function of permeability of atmosphere and seven from Group K, which acts as a function of clearness index was conducted based on all data, on solar altitude, on cloud ratio of solar irradiance, on solar altitude and cloud ratio of Chofu-city IDMP data ,Fukuoka-city data and Sapporo-city data of the Meteorological Agency, respectively. Generally, Group K's formulas were more accurate. lt has been found from the comparison that Formula l had smaller margin of error than the conventional formulas for estimation on direct and diffuse solar irradiance.

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