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Related Concept Videos

Eddy Currents01:25

Eddy Currents

Since eddy currents occur only in conductors, magnets can separate metals from other materials. For example, in a recycling center, trash is dumped in batches down a ramp, beneath which lies a powerful magnet. Conductors in the trash are slowed by eddy currents, while nonmetals in the trash move on, separating from the metals. This works for all metals, not just ferromagnetic ones.
Other major applications of eddy currents appear in metal detectors and the braking systems of trains and roller...

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Managing thermal emission using ENZ polar dielectrics for self-cooling window application.

Shakti P Mahato, Vipul Rastogi

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    Researchers developed a novel thermal emitter using polar dielectrics for efficient radiative cooling. This material achieves significant cooling power, offering energy-saving solutions for buildings and other applications.

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    Area of Science:

    • Materials Science
    • Nanotechnology
    • Optics

    Background:

    • Passive radiative cooling leverages thermal emission within the atmospheric transparency window (8-13 µm) to enhance energy efficiency.
    • Epsilon-near-zero (ENZ) materials exhibit unique optical properties, including the Berreman mode, enabling angle-dependent thermal emission.

    Purpose of the Study:

    • To design and characterize a broadband thermal emitter for efficient radiative cooling applications.
    • To investigate the potential of polar dielectric materials as ENZ materials for enhanced thermal emission.
    • To evaluate the performance of the designed emitter for self-cooling windows and other energy-saving technologies.

    Main Methods:

    • Fabrication of a multilayered thermal emitter using SiO/SiN/Al2O3/Ta2O5 polar dielectrics on an ITO-coated polycarbonate substrate.
    • Characterization of the emitter's thermal emission properties, focusing on emissivity in the 8-13 µm range at various angles and polarizations.
    • Assessment of optical properties, including visible spectrum transparency and near-infrared (NIR) reflection.
    • Quantification of radiative cooling power density under nighttime and daytime conditions.

    Main Results:

    • The designed emitter exhibits high emissivity in p-polarization at large oblique angles (70°-80°), covering the 8-13 µm atmospheric transparency window.
    • The structure demonstrates over 70% transparency in the visible spectrum and significant reflection in the NIR region.
    • Optimized structures achieved a radiative cooling power density of up to 199 W/m² at night and a mean daytime value of 60 W/m².
    • The emitter's angle-dependent emission, due to the Berreman mode in ENZ materials, facilitates directional heat dissipation.

    Conclusions:

    • The developed broadband thermal emitter is a promising candidate for energy-saving applications, particularly for self-cooling windows in buildings.
    • The directional emission capability enhances heat dissipation efficiency, even with obstructions.
    • The material's properties suggest potential applications in photovoltaic systems, waste heat management, and information encryption.