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| | Abstract | | 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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