Retroreflective facades for urban heat island mitigation: Experimental investigation and energy evaluations
Retroreflective facades for urban heat island mitigation: Experimental investigation and energy evaluations
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DOI：
10.1016/j.apenergy.2015.01.129
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发表时间：
2015-05-01
期刊：
影响因子：
11.2
通讯作者：
Santarnouris, Matheos
中科院分区：
文献类型：
--
作者：
Rossi, Federico;Castellani, Beatrice;Santarnouris, Matheos
建筑围护结构和城市道路的光学特性优化是降低城市热岛效应的重要研究领域。暴露在阳光下的表面的过热可以通过提高太阳反射率来减少。从这个意义上说，一些研究已经证明了冷却材料对城市热岛缓解的积极作用。除了传统的冷却材料，逆反射（RR）材料最近已被提出用于此应用。本文旨在评估RR膜的角反射率的几个倾斜角度的太阳辐射。为了再现白天太阳辐射倾角的变化，设计并使用了一个特设的实验装置。RR材料的特性，当击中太阳辐射具有不同的倾角，可以评估他们的行为在白天，如果用作新型城市涂料，以减轻城市热岛现象。测量结果被用作输入的原始算法，允许量化的RR材料的冷却潜力的能量反射和发送超出城市峡谷。实验表征和能量评估表明，RR材料可以有效地用作城市道路和建筑围护结构的涂层，以减少进入峡谷的循环能量。(C)2015爱思唯尔有限公司版权所有。
The optimization of optical properties of buildings' envelope and urban paving represents an important research field for reducing the urban heat island effect. The overheating of a surface exposed to sunlight can be reduced by improving solar reflectance. In this sense, several studies have demonstrated the positive effect of cool materials on UHI mitigation.In addition to traditional cool materials, retroreflective (RR) materials have been recently proposed for this application. The present paper aims at the assessment of angular reflectance of RR films for several inclination angles of solar radiation. To reproduce variation of solar radiation's inclination during the daytime, an ad hoc experimental setup was designed and used. Characterization of RR materials when hit by solar radiation with different inclinations allows to assess their behaviour on daytime if used as novel urban coatings for mitigation of the UHI phenomenon.Measurement results are used as input for an original algorithm which allows to quantify cooling potential of RR materials in terms of energy reflected and sent beyond the urban canyon. The experimental characterization and energy evaluations showed that RR materials could be effectively applied as coatings on urban paving and building envelope, in order to reduce the circulating energy into the canyon. (C) 2015 Elsevier Ltd. All rights reserved.