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Open AccessArticle

High-Performance Multilayer Radiative Cooling Films Designed with Flexible Hybrid Optimization Strategy

by Peng You 1,2, Xiong Li 1,2, Yijia Huang 1,2, Xiaoliang Ma 1,2, Mingbo Pu 1,2, Yinghui Guo 1,2 and Xiangang Luo 1,2,*
1
State Key Laboratory of Optical Technologies on Nano-Fabrication and Micro-Engineering, Institute of Optics and Electronics, Chinese Academy of Sciences, P.O. Box 350, Chengdu 610209, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
*
Author to whom correspondence should be addressed.
Materials 2020, 13(13), 2885; https://doi.org/10.3390/ma13132885
Received: 18 May 2020 / Revised: 18 June 2020 / Accepted: 25 June 2020 / Published: 27 June 2020
(This article belongs to the Section Materials Simulation and Design)
Despite their great potential for energy-saving applications, it is still challenging to design passive radiative cooling (RC) materials with simultaneous high performance and simple structures based on traditional design philosophy. To solve the contradiction between optimization speed and corresponding performance, we present a flexible hybrid optimization strategy based on a genetic algorithm (GA) in conjunction with the transfer matrix method and introducing the calculation of radiative cooling power density in the evaluation function of the GA. As a demonstration, an optimized coating with 1.5-μm-overlapping MgF2 and Si3N4 layers on top of a silver film was numerically designed. Based on a detailed analysis of the material’s electromagnetic properties and cooling performance, this coating achieved a radiative cooling power density of 62 W/m2 and a temperature reduction of 6.8 °C at an ambient temperature of 300 K. Our optimization strategy may have special significance in the design of high-performance RC materials or other multi-spectral engineering materials with simple structures. View Full-Text
Keywords: radiative cooling; optimization strategy; multilayer design; genetic algorithm; transfer matrix method radiative cooling; optimization strategy; multilayer design; genetic algorithm; transfer matrix method
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You, P.; Li, X.; Huang, Y.; Ma, X.; Pu, M.; Guo, Y.; Luo, X. High-Performance Multilayer Radiative Cooling Films Designed with Flexible Hybrid Optimization Strategy. Materials 2020, 13, 2885.

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