双层辐射冷却涂层利用层间折射率差实现极高的太阳反射率

IF 4.4 2区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY
FuQiang Wang, ChunZhe Li, ZhenNing Yang, WeiXin Xie, Xiang Li, ZengHui Xu, YuYing Yan, ZiMing Cheng
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引用次数: 0

摘要

被动式日间辐射冷却(PDRC)技术在降低冷却能耗方面具有巨大潜力。为了进一步提高 PDRC 涂层的光谱性能,目前研究人员大多关注功能粒子的选择和尺寸设计,而忽略了层间粘结剂所带来的光学性能增强效应。本研究基于层间折射率差增强太阳光谱背向散射性能的原理,提出并制备了一种双层 PDRC 涂层,上层以聚偏二氟乙烯(PVDF)为成膜材料,下层以聚二甲基硅氧烷(PDMS)为成膜材料,均填充有 Al2O3 和 SiO2 颗粒。双层 PDRC 涂层具有优异的光谱性能,太阳光谱反射率高达 98%,在 "大气窗口 "波段的发射率为 0.95。相比之下,基于相同厚度的 PVDF 和 PDMS 的单层 PDRC 涂层的太阳光谱反射率分别为 95% 和 94.7%。室外测试表明,在正午阳光直射下,PDRC 涂层可使温度降低 7.1°C。此外,PDRC 涂层还具有优异的耐候性、防水性和其他基本性能。本文为双层 PDRC 涂层的设计开辟了新思路,提供了方法指导。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A double-layer radiative cooling coating that utilizes the refractive index difference between layers to achieve extremely high solar reflectivity

Passive daytime radiative cooling (PDRC) technology has great potential in reducing cooling energy consumption. In order to further improve the spectral performance of PDRC coatings, current researchers mostly focus on the selection and size design of functional particles, while ignoring the optical properties enhancement effect caused by the interlayer binder. In this study, based on the principle that the refractive index difference between layers enhanced the backscattering performance of the solar spectrum, we proposed and manufactured a double-layer PDRC coating with polyvinylidene difluoride (PVDF) as the film-forming material in the upper layer and polydimethylsiloxane (PDMS) as the film-forming material in the lower layer, both filled with Al2O3 and SiO2 particles. The double-layer PDRC coating exhibited excellent spectral performance that a high solar reflectivity of 98% and an emissivity of 0.95 at the “atmospheric window” band. In comparison, the solar spectrum reflectivity of the single-layer PDRC coatings based on PVDF and PDMS of the same thickness was 95% and 94.7%, respectively. Outdoor tests showed that the PDRC coating achieved a temperature decrease of up to 7.1°C under direct sunlight at noon time. In addition, the PDRC coating had excellent weather resistance, water resistance, and other basic properties. This article opens up a new idea and provides methodological guidance for the design of double-layer PDRC coatings.

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来源期刊
Science China Technological Sciences
Science China Technological Sciences ENGINEERING, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
8.40
自引率
10.90%
发文量
4380
审稿时长
3.3 months
期刊介绍: Science China Technological Sciences, an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China, and published by Science China Press, is committed to publishing high-quality, original results in both basic and applied research. Science China Technological Sciences is published in both print and electronic forms. It is indexed by Science Citation Index. Categories of articles: Reviews summarize representative results and achievements in a particular topic or an area, comment on the current state of research, and advise on the research directions. The author’s own opinion and related discussion is requested. Research papers report on important original results in all areas of technological sciences. Brief reports present short reports in a timely manner of the latest important results.
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