ESTIMATION OF RETROREFLECTIVE CHARACTERISTICS BY SIMULATION AND EVALUATION OF SOLAR REFLECTANCE ON URBAN CANYON

Abstract

In this paper, the effect of retroreflective materials reducing the absorption of solar radiation in urban area are evaluated. The directional characteristics of reflection from glass beads with retroreflective properties are clarified using numerical simulation. Solar reflectances on two-dimensional urban canyon, as various building wall reflective characteristics and canyon aspect ratio, are estimated. The results show that glass beads have unique retroreflective properties and the retroreflective properties increase solar reflectance on urban canyon effectively. The effect is different in solar incident angle and canyon aspect ratio.