Electric window heating has been used for some time in Europe and the Americas, but in Ukraine it only enters the market as an independent heating device and raises the question of its heating capacity in winter and the benefits of using them. There are several works in this field that determine the efficiency and contribution to the energy needs of an electric-heated window house, but it is necessary to answer more specifically the question of the heating capacity of such windows as a single heating system, for example rooms of certain sizes.In the work present the design, thermophysical processes occurring in such windows and, by computer simulation of the thermal state of the window with the selected typical room, the results of the study of the heating capacity of the windows, depending on the relative glazing area to the total area of the outer enclosure and the ambient temperature conditions not exceeding the maximum heat emission 450 / and temperature 45 °С on the inner glass of the double-glazed window. the presented thermal model of the window with the room is implemented as a computer program with the possibility of a detailed analysis of the heating capacity of the window, depending on the parameters of the room and the outside temperature, as well as optimization of operational parameters to maintain comfortable conditions.
Experimental study of the level of relative humidity of tunnel air in the Kyiv subway in recent years has shown a constant exceeding of the normalized value (established by regulations) of relative humidity of tunnel air (>75 %) during the summer period, which led to the deterioration of equipment and the rims of the tunnel walls. Comparison of absolute humidity values of tunnel air and supply air from ventilation shafts from the environment under the current tunnel ventilation modes led to the recommendation to change these modes from removal to injection of air with lower absolute humidity than in the problem tunnels. This idea was verified and validated using 3D modeling of the thermo‐gas‐dynamic and humidity conditions of the tunnels over 3 calendar years, resulting in a decrease in relative humidity below 75 % due to changes in the operating modes of tunnel ventilation. The simulation results were confirmed by experimental tests in the subway and implemented for use.
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