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Solar Reflectance of Glazes for Exterior Wall Tiles

Exterior wall tiles with high solar reflectance are effective in mitigating heat-island phenomenon. Such walls have also the potential to decrease the warming up of building interiors in mid-summer. Several kinds of glazes for wall tiles are characterized from the point of view of the visible and infra-red reflectance for the purpose of improving the solar reflectance. The incident angle of sunlight on vertical exterior wall is larger than 70 degrees at midday of the summer season in Japan. It is theoretically expected that the reflectance increases with the increase of incident angle. The practical solar reflectance of glazed wall tile is estimated by measuring the hemi-spherical integrated spectral reflectance with an oblique incident light. It was observed that even the reflectance of mat glaze increased dramatically with the increase of incident angle. This improvement of spectral reflectance occurred throughout the visible and near-infrared region and was independent of the color of the glaze.