Збірник наукових праць Українського державного університету залізничного транспорту Збірник наукових праць УкрДУЗТ, 2019, вип. 186 73 components along the directions of x, y, z coordinates, pressure and humidity. The thermogasdynamic and humidity model was developed using the Ansys CFD software. Verification of the computer model was carried out using experimental data for 2018. Unknown tunnel air flow rates were determined by the computer model parameters identification. When modeling the heat and humidity state of the tunnels, the thermal inertia of the soil layer around the tunnels was taken into account. Simulation of the heat and humidity state of the SIL tunnels during the calendar year showed that a change in the operating modes of ventilation units during the summer period, when air from the environment is pumped into the tunnel and removed from the tunnels by station fans, will reduce the relative humidity below 75 %. The simulation results were confirmed by experimental tests in the Kiev metro and introduced for use throughout the calendar year in the future.
The results of analysis and forecasting of the radioactive aerosols (RA) spread in the New Safe Confinement (NSC) under various conditions are presented. The conditions for the commissioning NSC, operation, dismantling of the OS (early dismantling) and removal of radioactive waste from the central hall of the OS are considered. Such analysis and forecasting was performed using computer CFD (computational fluid dynamics) model of the OS and NSC. The model takes into account sedimentation, accumulation and secondary dust emissions on the surfaces under the NSC, which allows obtaining distributions of surface contamination and determine the places of the highest contamination. References 5, tables 1, figures 5.
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.
Збірник наукових праць Українського державного університету залізничного транспорту Збірник наукових праць УкрДУЗТ, 2019, вип. 183 35 ТЕПЛОЕНЕРГЕТИКА (144) УДК 697.92: 697.95 ЗНИЖЕННЯ ВОЛОГОСТІ В ТУНЕЛЯХ КП «КИЇВСЬКИЙ МЕТРОПОЛІТЕН» ШЛЯХОМ ЗМІНИ РЕЖИМІВ РОБОТИ ВЕНТИЛЯЦІЙНИХ УСТАНОВОК Старш. наук. співроб. А. І. Дейнеко, д-р техн. наук П. Г. Круковський, мол. наук. співроб. Д. І. Скляренко, М. М. Федотов, канд. техн. наук О. Ю. Тадля
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