Optimization of visible transmission and NIR reflection in multilayer via PSO: Simulation and experimental validation

Kaihua Zhang, Zhiying Chen, Jinyang Guo, Shuai Gao, Kun Yu, Xiansheng Zhang, Yufang Liu and Xiaohu Wu

Renewable Energy, 2024, vol. 237, issue PD

Abstract: Transparent heat reflective windows (THRW) effectively manage solar energy by reflecting near-infrared (NIR) heat while maintaining high visible (VIS) light transmittance, thus improving building energy efficiency. Conventional THRW designs using dielectric/metal/dielectric (D/M/D) structures often increase metal thickness for better NIR reflectance, which compromises VIS transmittance. In this work, we present a dielectric/metal/dielectric/metal/dielectric (D/M/D/M/D) multilayer structure, utilizing TiO2 as the dielectric and Ag as the metallic component. The film thicknesses were systematically optimized using the particle swarm optimization algorithm to achieve an optimal balance between high VIS transmittance ((T‾VIS = 87 %) and high NIR reflectance (R‾NIR = 95 %). Additionally, the structure shows only 15 % UV transmittance due to absorption by TiO2 and reflection by Ag. The multilayer films are fabricated using electron beam evaporator, with the experimental results show that the multilayers maintain good VIS transmittance as well as high NIR reflectance. This high-performance THRW design demonstrates significant potential for energy-saving applications in hot climates, offering a viable solution for enhancing building energy efficiency and occupant comfort in the future.

Keywords: Transparent-heat reflective windows; Building energy efficiency; Spectrally selective regulation; Particle swarm optimization algorithm (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:237:y:2024:i:pd:s0960148124019815

DOI: 10.1016/j.renene.2024.121913

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