Gray films for building windows have an effect of cutting incident solar radiation without intercepting of visibility through windows. We analyzed of spectral transmittance and spectral reflectance of gray films for building windows considering the change of incident angle of solar radiation against vertical glasses. As incident angle of solar radiation increases from 0° to 70°, as spectral transmittance increases. And also we clarified its efffect on decrease of room temperature by numerical simulation. In the case of a building with an atrium which is located in Kashiwazaki, Niigata, whose total floor area is about 800㎡ and whose south wall is covered with windows, solar heat gain was reduced 55% in summer seasons, and 46% in winter seasons.
建築物窓用遮熱フィルムの日射遮蔽効果に関する実験的検討 アトリウム空間をもつ建物の空調負荷削減および快適性向上に関する研究 第1報
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