Radiative cooling by silicone-based coating with randomly distributed microbubble inclusions
Radiative cooling by silicone-based coating with randomly distributed microbubble inclusions
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通过具有随机分布的微泡夹杂物的硅基涂层进行辐射冷却
DOI：
10.1117/1.jpe.9.032705
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发表时间：
2019
影响因子：
1.7
通讯作者：
S. Han
中科院分区：
文献类型：
--
作者：
Joseph D. Alden;S. Atiganyanun;Robert Vanderburg;Seung Ho Lee;John B. Plumley;Omar K. Abudayyeh;Sang;S. Han
抽象的。我们证明，白色涂层的有机硅嵌入随机分布的微泡提供了高效的日间辐射冷却与廉价的材料和制造工艺。在我们的材料系统中，太阳光被强烈散射，吸收最小，热量通过中红外（IR）辐射有效地去除。在我们之前的研究中，固体微球涂层在冷却效率方面优于商业太阳能排斥白色涂料，但其机械坚固性需要改进以用于实际应用。我们工作中的材料系统大大增强了机械鲁棒性，同时提供了上级商业太阳能排斥涂料的冷却性能。为了便于处理，我们使用非优化的结构，降低光学散射强度。通过增加涂层厚度还可以实现强的太阳能排斥。这种策略对于实际的屋顶应用是理想的，其中涂层厚度与冷却性能和材料成本相比是次要的。此外，硅树脂在地外环境中稳定，并在宽中红外光谱范围内有效辐射热量。我们有机硅涂层的这些材料特性为空间应用中的辐射冷却提供了巨大的潜力。
Abstract. We demonstrate that white coatings consisting of silicone embedded with randomly distributed microbubbles provide highly efficient daytime radiative cooling with inexpensive materials and fabrication processes. In our material system, sunlight is strongly scattered with minimal absorption, and heat is effectively removed through mid-infrared (IR) radiation. In our previous study, solid microsphere-based coatings outperformed commercial solar-rejection white paint in cooling efficiency, but their mechanical robustness needed improvement for practical applications. The material system in our work substantially enhances the mechanical robustness while providing superior cooling performance to commercial solar-rejection paint. For ease of processing, we use nonoptimized structures with reduced optical scattering strength. Strong solar rejection is yet achieved by increasing coating thickness. This strategy is desirable for practical rooftop applications where coating thickness is of minor importance in comparison to cooling performance and materials cost. In addition, silicone is stable in extraterrestrial environments and efficiently radiates heat over broad mid-IR spectrum. These material properties of our silicone coatings promise great potential for radiative cooling in space applications.