Heat Transfer Simulation for Nano-Coated Glass in Saudi Arabia

Abstract

Abstract-The amount of heat flow within building interior is important for understanding and predicting its thermal behaviors. To achieve greater energy efficiency of a building, the performance of window system is required to improve. Glazing materials in windows provide adequate illumination levels in the interior of buildings receiving the visible part of solar radiation. The other part of solar radiation in the infrared region entering through glazing causes increase of interior temperature. Hence glazing is a major component in designing and analyzing problems such as energy demands, assessment of heating and cooling loads and thermal comfort in a building. This study focuses on the thermal behavior of glass for development of functional nano-coatings of window glazing for the regional conditions in Saudi-Arabia. Different materials and its optimized film properties of thickness and doping level of antimony tin oxides (ATO) were prepared and their optical and thermal properties were systematically investigated. Glass U-factor, Solar Heat Gain Coefficient (SHGC) and net heat transfer through window were calculated. The results showed that the thermal insulation of the glass effect of coating thickness and doping level was significant. The simulated net heat transfer through window decreased linearly with increase of both of coating thickness or ATO concentration. Furthermore, the overall transmittance in the visible region and reflectance in infrared and ultraviolent regions decrease with increasing of weight content of antimony doped tin oxides ATO, and similarly for increasing of coating thickness.