日射量による昼光照度の推定方法に関する研究

Abstract

The solar irradiance and illuminance are important as meteorological data to predict indoor environment. However, the data concerning the daylight are not measured at the ordinary meteorological stations. The horizontal global irradiance is normally measured in the meteorological stations in Japan. The luminous efficacy, by which the irradiance can be converted into the illuminance, is essential for obtaining fundamental daylight data for the prediction of the daylit environment. The luminous efficacy has been investigated for a long time in the world. Several considerations have been put forward. But the sufficient theories on the luminous efficacy have not established yet. The relations between the diffuse irradiance and the diffuse illuminance, the direct normal irradiance and the direct normal illuminance, and the horizontal global irradiance and the horizontal global illuminance were examined and discussed based on the data acquired at the measurement of the IDMP station operated by the authors. The results of the examination are stated and the equations newly proposed by the authors on the luminous efficacies are introduced in this paper.