24 May 2018 Numerical analysis of angle-selective one-dimensional periodic structure for building energy management
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Reflective coatings are used on building walls and roofs to reducing heating from solar radiation, and thus have a high reflectivity for the visible and near-infrared wavelengths where sunlight has most of its energy. However, the loss of solar heating during winter increases energy consumption. For temperate latitudes, the solar altitude at noon during summer approaches zenith, while at noon in winter the sun appears much lower in the sky. We propose to take advantage of this change in solar altitude from summer to winter to passively adjust the reflection properties to season. Towards this aim, we numerically calculate the diffraction efficiency of a one-dimensional periodic microstructure using rigorous coupled wave analysis (RCWA). We analyze the angular selectivity of the grating structure for its suitability to retain cooling properties in summer while allowing solar heating in winter. In order to explore angle-selective reflection properties, we explored a series of cross-sectional shapes for the grating by adjusting its geometrical parameters. We find that a rectangular cross-sectional profile produces high angular selectivity of reflection but narrow spectral bandwidth, and trapezoidal shapes produce smaller angular selectivity but broader bandwidth.
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Kazutaka Isoda, Kohki Nagata, Mizue Ebisawa, Yukitoshi Otani, "Numerical analysis of angle-selective one-dimensional periodic structure for building energy management", Proc. SPIE 10678, Optical Micro- and Nanometrology VII, 106780X (24 May 2018); doi: 10.1117/12.2307306; https://doi.org/10.1117/12.2307306


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