Designing Mesoporous Photonic Structures for High-Performance Passive Daytime Radiative Cooling
Designing Mesoporous Photonic Structures for High-Performance Passive Daytime Radiative Cooling
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DOI：
10.1021/acs.nanolett.0c04241
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发表时间：
2021-02-01
期刊：
影响因子：
10.8
通讯作者：
Yang, Yuan
中科院分区：
文献类型：
--
作者：
Chen, Meijie;Pang, Dan;Yang, Yuan
被动日间辐射制冷（PDRC）是近年来无电制冷的一个重要研究方向。多孔聚合物由于其优异的性能和可扩展性而对PDRC具有吸引力。剩下的一个基本问题是PDRC性能如何取决于孔隙性质（例如，半径、孔隙率），这对于指导未来的结构设计至关重要。在这项工作中，进行光学模拟来回答这个问题，并研究了孔径，孔隙率和厚度的影响。我们发现混合纳米孔（例如，半径为100和200 nm）在300 μ m的厚度下具有比单一尺寸的孔（0.811）高得多的太阳能反射率（R）。在半湿润大气条件下，在Al衬底下方，（R）相对于bar（太阳能）、热发射率（λ）相对于bar（LWIR）和净冷却功率P-cool分别达到0.980、0.984和72 W/m2。这些模拟结果为设计高性能PDRC多孔涂层提供了指导。
Passive daytime radiative cooling (PDRC) has drawn significant attention recently for electricity-free cooling. Porous polymers are attractive for PDRC since they have excellent performance and scalability. A fundamental question remaining is how PDRC performance depends on pore properties (e.g., radius, porosity), which is critical to guiding future structure designs. In this work, optical simulations are carried out to answer this question, and effects of pore size, porosity, and thickness are studied. We find that mixed nanopores (e.g., radii of 100 and 200 nm) have a much higher solar reflectance (R) over bar (solar) (0.951) than the single-sized pores (0.811) at a thickness of 300 mu m. With an AI substrate underneath, (R) over bar (solar), thermal emittance (epsilon) over bar (LWIR), and net cooling power P-cool reach 0.980, 0.984, and 72 W/m(2), respectively, under a semihumid atmospheric condition. These simulation results provide a guide for designing high-performance porous coating for PDRC applications.