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Angular-Dependent Energy-Saving Smart Windows.

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|September 15, 2025
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Summary
This summary is machine-generated.

This study introduces a novel smart window using dynamic metasurfaces that adapts to both temperature and solar angle. This innovation significantly improves energy efficiency and visual comfort in buildings.

Keywords:
dual-band optical modulationmetasurfacepassive thermal regulationphase change materialseasonal solar variationsmart windows

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Sustainable Architecture

Background:

  • Windows account for ~50% of building heat loss.
  • Existing smart windows often neglect solar zenith angle variations, focusing only on temperature.
  • Dynamic metasurfaces offer potential for advanced optical control.

Purpose of the Study:

  • To develop a smart window with dual-responsiveness to temperature and solar zenith angle.
  • To engineer angular and thermal responsiveness using scalable manufacturing techniques.
  • To improve energy efficiency and visual comfort in buildings through advanced window technology.

Main Methods:

  • Fabrication of a smart window using dynamic metasurfaces and phase-change materials (vanadium dioxide - VO2).
  • Utilizing scalable mesh printing and spray-coating for industrial compatibility.
  • Engineering a Fabry-Perot resonator for dual-modulation of solar and thermal radiation.

Main Results:

  • The smart window demonstrates dynamic response to both solar zenith angle and temperature.
  • Achieved promising luminance transmittance (36.8%), solar modulation (30.8%), and infrared emissivity modulation (0.4).
  • Outperformed commercial low-emissivity glass and state-of-the-art designs in energy-saving simulations and daylighting.

Conclusions:

  • The proposed smart window offers superior energy-saving performance and visual comfort compared to conventional designs.
  • Integration of metasurfaces and phase-change materials is a viable strategy for dynamic optical modulation.
  • This technology holds potential for wide applications in energy-efficient building facades and beyond.