The article discusses the issues of solar radiation exposure of vertical enclosing structures. The external enclosing structures receive heat from exposure to solar radiation, which leads to heating of the wall, an increase in temperature in the entire structure and a change in the microclimatic parameters of the room. Modelling the processes of temperature change in the thickness of the enclosing wall structure will allow taking into account the processes of heat transfer when choosing building materials for the construction of buildings.
To study the effect of the amount of solar radiation received by vertical surfaces of buildings on the temperature change inside the enclosing structure, modelling of the thermophysical parameters of the wall using the COMSOL software package was used. Single-layer, double-layer, and three-layer walls of buildings with facade materials with different absorption coefficients of solar radiation were chosen as the objects of research. The simulation was conducted for the summer solstice.
The values of solar radiation received by vertical structures oriented to the south on the day of the summer solstice are considered. The total amount of solar radiation received by the vertical structures of the southern facade, located at 48 °C and 58 °C, on the day of the summer solstice, is almost the same. To estimate the heating of vertical enclosing structures by solar radiation, the formula of A.M. Shklover was used. The modelling was carried out for three types of enclosing structures (one-, two- and three-layer). When modelling heat transfer processes, the colour of facade finishing materials was taken into account, a comparative analysis of heat transfer by enclosing structures with the same absorption coefficients of solar radiation was carried out, as well as an analysis of walls, which facades had different absorption coefficients of solar radiation.
The influence of the amount of solar radiation received by the vertical surfaces of buildings on the temperature change in the thickness of the enclosing wall structure is shown. The results of the study showed that the solar radiation absorption coefficient of the facade material has a greater effect on the temperature change inside the enclosing structures with the lowest thermal inertia. It is established that when the coefficient of absorption of solar radiation by the facade material is 0.3, heat transfer in single-layer and double-layer fencing occurs with almost the same intensity, with an increase in the coefficient of absorption of solar radiation by the facade material to 0.6, the intensity of heat transfer in the two-layer fencing increases.
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• solar radiation
• wall surface temperature
• temperature in the thickness of the fence
• southern facade of the building