| 講演要旨(和文) | | 在来型エネルギー資源が減耗し続け，代替エネルギー普及の目途もたっていない昨今，省エネルギーの徹底的な推進が重要である．電気エネルギーの主な消費源の1つが、夏場のエアコンの使用である．それを抑えることができるのであれば，大幅な省エネルギーの達成が期待できる．ミクロン単位の微小セラミック球が混ぜ込まれた塗料（遮熱塗料）を金属の表面塗ることで，日光照射時の温度上昇が抑制されることが，実験的・経験的に知られている．遮熱塗料を建物の屋根や外壁に塗布すれば，夏の昼間の室温上昇が劇的に抑えられることが期待できる．しかし，遮熱塗料が輻射熱を抑制するメカニズムについては，理論的に殆ど解明されていない．本研究では，遮熱塗料による輻射熱抑制効果の理論的な解明を目標とし，Mie散乱に基づいたモンテカルロ・レイトレーシング法を用いて，遮熱塗料の構造がどのように輻射熱抑制効果に寄与するかを検討する． |
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| | 講演要旨(英文) | | After the earthquake and the nuclear power plant accident happened in 2011 in Japan, there has been a fatal electric power shortage problem in summer due to great demand for energy for air-conditioning. It is of key importance to cut the demand and to save the energy. In fact, the temperature of materials rises when they are exposed to the sunlight (insolation heating). Insolation heating could be suppressed when the materials are coated with paint admixed with fine silica spheres (insulating paint). By coating buildings' walls and roofs with such paint, the temperature in rooms could be kept lower without air-conditioners. These phenomena are well known and have been utilized in the past, but have hardly been analyzed theoretically yet. Theoretical analysis would greatly enhance the effects of the suppression of insolation heating. We focus on the light scattering by fine spheres assuming that it is the scattering that causes the phenomena. In this study, we consider fine silica spheres distributed in a paint layer coating a material, and analyze its scattering characteristics using the Monte Carlo ray tracing method based on the Mie theory. We finally investigate how the structure of the paint attributes to the scattering characteristics. |
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