In order to develop a pigmented coating with low visible reflectivity and high near-infrared reflectivity, fabrication of the pigmented coatings and measurement of the spectral reflectivity are conducted. From the measurement results and theoretical analysis indicate that the nanoparticle-pigmented coatings enable to control the spectral reflectivity.
Considering the radiarive energy balance at the surface of glass window receiving the solar, the thermal insulation performance is evaluated by non-gray combined heat transfer analysis of radiation and conduction. Also, the analysis of the effects of mist generation on radiative energy balance of the Sun and the Earth is conducted.
Phonon transport phenomenon is analyzed by numerical simulation in nano/micro structure where Fourier’s law is not applicable. It is indicated that when Knudsen number become large, heat transfer mechanism by conduction is differ from observed in macroscale.
When radiative gas such as hydrogen and carbon dioxide exist, the heat transfer consists of not only convective heat transfer but also radiation. Especially in high temperature condition such as site of fire, radiative heat transfer becomes dominant. The combined heat transfer of radiation and convection is analyzed by numerical simulation for practical temperature fields.
Radiative heat transfer analysis about the more realistic cloud model is done by considering a heterogeneous temperature field, poly-dispersed cloud particles and the form of cloud. By using an unstructured grid, realistic clouds with a smooth curved surface are expressed, and the absorption of the radiative gas and the anisotropic scattering by cloud droplets are considered. Even if the cloud receives sunlight in the daytime, the radiative cooling phenomenon is occurred in the top of the cloud.
