Laboratorial investigation on optical and thermal properties of cool pavement nano-coatings for urban heat island mitigation
Laboratorial investigation on optical and thermal properties of cool pavement nano-coatings for urban heat island mitigation
复制标题
用于缓解城市热岛效应的冷路面纳米涂层光学和热性能的实验室研究
DOI：
10.1016/j.buildenv.2018.10.017
复制
发表时间：
2019-01-01
影响因子：
7.4
通讯作者：
Harvey, John
中科院分区：
文献类型：
--
作者：
Xie, Ning;Li, Hui;Harvey, John
城市热岛效应导致建筑和环境降温能耗增加。反光涂层是一种有效抑制城市热岛效应的降温路面技术。然而，彩色路面反射涂层在全太阳光谱下的光学性能及其相互关系的研究还处于起步阶段。本文制备了10个非白色涂层样品，以评价颜料和涂层的光学性能和热性能。研究发现，颜色明度是影响可见光反射率的主要因素，但不影响近红外反射率。掺铬涂层的反射率达到60%左右，近红外反射率达到95%左右的白色涂层。深色和中色涂层的亮度与可见光反射率呈线性关系，浅色涂层的亮度与可见光反射率呈指数增长关系。统计分析表明，可见光和短波近红外反射率(400 nm~1100 nm)是影响涂层热性能的主要因素。研究结果可为优化反射式凉爽路面涂料的设计，开发无眩光和美观问题的同色异谱涂料以缓解城市热岛效应提供借鉴和参考。
Urban Heat Island (UHI) effect causes the increasing energy consumption for building and environment cooling. Reflective coating is an effective cool pavement technology to counterbalance UHI. However, the investigation of the optical properties and their relation of colored reflective pavement coatings at full solar spectrum are still in its infancy. This paper prepared ten non-white coating samples to evaluate the optical properties and thermal performance of pigments and coatings. It was founded that color lightness is a dominant factor of visible reflectance however it does not affect the near-infrared reflectance. The coatings doped in chrome achieved reflectance around 60% and the near-infrared reflectance was as high as the white coating around 95%. The relation between lightness and visible reflectance was linear for coatings in dark and medium color while the exponential growth was shown for the coatings in light color. Based on the statistical analysis, the visible and short wave near-infrared reflectance (400 nm-1100 nm) were the dominant factors to influence thermal performance of coatings. The investigated results could provide insights and references for optimizing the design of reflective cool pavement coating and developing the metameric matching colored coatings without glare and aesthetic problems to mitigate the urban heat island effect.