| 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．夏の需要ピーク時では、家庭・オフィスでの電力消費量のおよそ3分の1をエアコンが占める．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）を金属の表面に塗ることで，日光照射時の温度上昇が抑制されることが，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の抑制が期待できる．しかし，そのメカニズムの理論的な解明は殆どされていない．本研究では，最適な塗料構造の検討を目標とし，Mie散乱理論に基づいたモンテカルロ・レイトレーシング法を用いて，塗料中の球の物性がいかに輻射熱抑制効果に寄与するかを解析する． |
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| | 講演要旨(英文) | | The 2011 off the Pacific coast of Tohoku Earthquake and the successive nuclear disasterat the Fukushima Daiichi Nuclear Power Plant have causeda risk of the power shortage, especially in mid summer. It has become of key importance to save the energy.About one third of the total electricity demand at the peak consumption in summer is for the air-conditioning in the household and office sectors in Japan. It is, therefore, necessary to think deliberately of the reduction of electric power demand for air-conditioning.In fact, the temperature of housings could be kept lower, without air-conditioning,by coating them with paint admixed with fine spheres (insulating paint). Insulation effects are experimentally well known, but merely analyzed theoretically yet. In this study, we focus on the electromagnetic wave scattering induced by fine silica spheres. We consider fine spheres randomly distributed in a paint layer, and analyze its scattering characteristics using the Monte Carlo ray tracing method based on the Mie theory. The result is found to be in good agreement with commercial paint. We conclude that the Monte Carlo simulation has led us to a quantitative analysis of the insulation effects and to find the optimum properties of spheres to be admixed with paint. |
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