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

Peng You1,2, Xiong Li1,2, Yijia Huang1,2

  • 1State 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.

Materials (Basel, Switzerland)
|July 2, 2020
PubMed
Summary

Researchers developed a new hybrid optimization strategy for passive radiative cooling (RC) materials. This method enhances cooling performance and simplifies material structures, offering a significant advancement in energy-saving technologies.

Keywords:
genetic algorithmmultilayer designoptimization strategyradiative coolingtransfer matrix method

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optics

Background:

  • Designing passive radiative cooling (RC) materials with high performance and simple structures is challenging using traditional methods.
  • Existing design philosophies often face a trade-off between optimization speed and material performance.
  • There is a need for advanced strategies to overcome these limitations in developing effective RC materials.

Purpose of the Study:

  • To present a flexible hybrid optimization strategy for designing high-performance passive radiative cooling (RC) materials.
  • To address the challenge of balancing optimization speed with performance in RC material design.
  • To demonstrate the efficacy of the proposed strategy in creating simple yet effective RC structures.

Main Methods:

  • Developed a hybrid optimization strategy combining a genetic algorithm (GA) with the transfer matrix method.
  • Integrated the calculation of radiative cooling power density into the GA's evaluation function.
  • Numerically designed an optimized coating comprising MgF2 and Si3N4 layers on a silver film.

Main Results:

  • The optimized coating demonstrated a radiative cooling power density of 62 W/m².
  • Achieved a significant temperature reduction of 6.8 °C at an ambient temperature of 300 K.
  • The designed material features a simple structure with 1.5-μm-overlapping MgF2 and Si3N4 layers.

Conclusions:

  • The proposed hybrid optimization strategy effectively enhances passive radiative cooling (RC) performance.
  • This approach enables the design of high-performance RC materials with simplified structures.
  • The strategy holds potential for designing other multi-spectral engineering materials.