長期観測データに基づく昼光の直散分離に関する実証的研究

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This thesis deals with a division method of direct and diffuse daylight illuminance from measured global horizontal illuminance, using minutely data on daylight illuminance, temperature and humidity collected during daylight observation (IDMP) for ten years conducted by one of the authors in Chofu city, Tokyo. Based on seven-year-long data for analysis, the authors have drawn up a division method of direct and diffuse daylight iluminance from measured global horizontal illuminance. This method belonging to Group K as a coefficient for clearness index is plain and applicable to any weather. Direct illuminance was calculated from known global illuminance, employing Formula A1 presented in this thesis, which estimated direct illuminance as a coefficient only for clearness index of daylight, Formula A2, which estimated diffuse illuminance. Comparison among estimated direct illuminance from measured global horizontal illuminance based on Formula A1, on Formula A2, on the past division method of daylight illuminance and on the past division method of global horizontal solar irradiance with luminouse efficacy of daylight was conducted using three-year data for appraisal. It has been quantitatively proved that the method presented in this thesis, which is designed to find out direct and diffuse illuminance from global illuminance, is plain and accurate for practical use.
2005-04-30