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Investigating performance prediction and optimization of spectral solar reflectance of cool painted layers

机译：研究冷喷涂层的性能预测和光谱太阳反射率的优化

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摘要

The air temperatures are generally found to be higher in the urban areas in comparison with the suburban or rural areas. One of the countermeasures to mitigate this urban heat island is to coat the surfaces of buildings with paint that has higher solar reflectance; the method is commonly referred to as "cool painting". It is important to evaluate the solar reflectance of the paints used for such paintings. Though solar reflectance can be measured by a spectrophotometer with an integrating sphere, accurate numerical prediction of reflective properties of the painted layer including arbitrary pigments can contribute to further development of the cool paint material. The effect of diffuse reflection in the painted layer is more significant than that of specular reflection on the painted surface. It is also important to evaluate the scattering properties of pigments, which are related to the reflection performance. For evaluating the scattering properties of a pigment in a medium, anisotropic scattering should be considered. In this study, we applied the radiation element method for predicting the solar reflectance of a painted layer. The hemispherical spectral reflectance of a painted layer, including TiO2, ZnO or Al2O3, was evaluated. Our results showed that spectral reflectance of a painted layer with arbitrary values of particle sizes, volume fraction of pigment, and coating thickness can be calculated by this method. Further, the validity of this numerical method was evaluated by comparison with the reflective property of the actual painted layer by means of spectrophotometry. (C) 2015 Elsevier B.V. All rights reserved.
机译：与郊区或农村地区相比，通常发现市区的气温更高。缓解这个城市热岛的对策之一是在建筑物的表面涂上具有更高日光反射率的涂料。该方法通常称为“炫酷绘画”。评估用于此类涂料的涂料的太阳反射率很重要。尽管可以通过具有积分球的分光光度计来测量太阳光的反射率，但是包括任意颜料的涂膜层的反射特性的精确数值预测可以有助于冷涂料的进一步开发。涂漆层中的漫反射效果比涂漆表面上的镜面反射效果大。评估与反射性能有关的颜料的散射特性也很重要。为了评估颜料在介质中的散射特性，应考虑各向异性散射。在这项研究中，我们将辐射元素方法应用于预测涂层的太阳反射率。评价了包括TiO 2，ZnO或Al 2 O 3的涂层的半球光谱反射率。我们的结果表明，通过这种方法可以计算出具有任意粒径，颜料体积分数和涂层厚度的涂漆层的光谱反射率。此外，通过与分光光度法比较实际涂漆层的反射特性来评估该数值方法的有效性。 （C）2015 Elsevier B.V.保留所有权利。

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