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This paper presents a thermal analysis of compounds called smart windows in typical building design; such windows are covered with a vanadium dioxide film doped with tungsten and are characterized by their phase transition which makes the transmission coefficient high for low temperatures and low for high temperatures. This leads to the natural optimization of thermal comfort in summer and winter through a decrease in solar radiation transmission in the summer and an increase in it in the winter. A comparative study of four types of glass has been carried out both in summer and winter: simple glass SiO2, dioxide of vanadium un-doped glass, vanadium dioxide glass doped with 3% tungsten and 5% tungsten in order to evaluate their effect on the interior temperature of the building. For these reasons, a thermal model in the dynamic state has been developed to assess the thermal performance in such a building and to evaluate the effect of these windows on thermal comfort in terms of heat flow, density and internal temperature. The analysis was carried out having taken into account the external weather conditions of Fez, such as radiation, natural convection, air exchange, and the outdoor temperature as well as different parameters of the building envelope.

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