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Optic-energy and visual comfort analysis of retro-reflective building plasters

机译：逆反射建筑灰泥的光能和视觉舒适性分析

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This paper presents the results of the characterization of new retroreflective (RR) plasters for outdoor applications. The paint was obtained through deposition of four different types of RR microspheres on a traditional plaster for exterior applications. The plasters were characterized through a spectrophotometric, directional and colorimetric analysis. All the types of microspheres provide strong RR behavior for incident light directions from 0 degrees to 60 degrees with respect to the surface normal. However, the aluminum coating, with and without fluompolymer coating, affects negatively the global reflectance and change completely the tiles' original color, making the application of the aluminum RR tiles very limited. Glass and barium microspheres instead improve the optic properties of the original plaster, with negligible effects on the color. An analytic model was used to evaluate the amount of energy that is reflected beyond the canyon by the RR materials. It was found that at 42 degrees N latitude, the best performing configurations are the combination of RR facade and RR pavement, for glass spheres. Two fullscale vertical surfaces, covered with RR plaster with glass microspheres and diffusive plaster respectively, were developed to investigate the visual comfort of pedestrians, in particular glare. Results show that the Daily Glare Probability (DGP) and superficial temperature for the RR wall is always lower than those for the diffusive wall.
机译：本文介绍了用于户外应用的新型逆反射（RR）灰泥的表征结果。该涂料是通过将四种不同类型的RR微球沉积在用于外部应用的传统石膏上而获得的。通过分光光度法，方向法和比色法对石膏进行表征。对于相对于表面法线从0度到60度的入射光方向，所有类型的微球都具有很强的RR行为。但是，无论是否使用氟聚合物涂层，铝涂层都会对整体反射率产生负面影响，并完全改变瓷砖的原始颜色，从而使铝RR瓷砖的应用受到很大限制。相反，玻璃和钡微球改善了原始灰泥的光学性能，对颜色的影响可忽略不计。使用分析模型评估RR材料反射到峡谷外的能量。结果发现，在北纬42度，对于玻璃球而言，性能最佳的配置是RR外墙和RR路面的组合。为了研究行人的视觉舒适度，特别是眩光，开发了两个全尺寸垂直表面，分别覆盖了带有玻璃微球的RR灰泥和漫射灰泥。结果表明，RR墙的每日眩光概率（DGP）和表面温度始终低于扩散墙。

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