Design of independent and radiation modulation enhanced electrochromic windows in visible and infrared ranges

Wang, Xueyu; Chen, Shuo; Liu, Yumin; Wu, Tiesheng; Li, Jing; Zhu, Danfeng; Sun, Yuhang; Fan, Hongjie

doi:10.1016/j.optlastec.2023.109774

Cited by 4 publications

(1 citation statement)

References 30 publications

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“…Thermochromics [9][10][11][12][13] with a reversible color change and thermotropics [14][15][16] with a change in light-scattering and reflective properties that depend on the ambient temperature are fairly simple and affordable materials that require increased long-term stability and energy-saving potential. Electrochromic glasses [17][18][19][20][21][22] that change their optical properties with a change in the electric polarity and the magnitude of the applied voltage have such advantages as the ability to switch at any time, the transparency across the switching range, and gradual switching dependently on the voltage. For wider applications, the study of electrochromic technologies is aimed at technical and economic improvement.…”

Section: Introductionmentioning

confidence: 99%

Grating optical filter with angular-selective transmission for smart windows

Zakirullin,

Odenbakh

2024

Opt. Eng.

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The results of full-scale experiments on models of a smart window with a doublegrating optical filter are presented. Such a filter has an angular-selective direct light transmission due to two thin-film gratings with transmissive and non-transmissive (absorptive, reflective, scattering, or chromogenic) parallel strips. The gratings are angled to match the solar path relative to the window to optimize the daylight and solar heat gain without the use of shading/redirection devices. Due to the strip widths, relative positions, and slope angles of both gratings, calculated to minimize transmission at a preset time, such a smart window self-adapts to daily and seasonal changes in the position of the Sun. Diffused radiation passes through the transmissive strips of both gratings, increasing the daylight and thermal comfort indoors. Experimental data for the four hottest months confirmed the results of numerical simulation based on a previously developed method for calculating the temporal characteristics of the directional light transmission of filters. The minimum transmittance was achieved at a preset time on June 15, for which all geometric parameters of the filters were calculated; on July 15, August 15, and September 15, the light transmission consistently increased, indicating good seasonal adaptation. Conclusions regarding the selection and optimization of the strip widths of the gratings, as well as the processing of experimental data, were obtained.

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