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- W3094093536 abstract "Ensuring the normalized parameters of the microclimate of tunnel air of service connecting branches (SCB) of the deep underground utility company “Kiev Metro” with a length of 1400 m is a priority, through avoiding damage to the insulating materials of the contact flights, which can cause a short circuit. The location of ventilation equipment or drainage or heating installations in a single-track tunnel of the connecting branch is impossible due to limited space, therefore the only place where such equipment can be located is a bypass tunnel. With the optimized operation of the mechanical tunnel ventilation system in energy-saving modes, in 2019, for technical reasons, the soil layer around the tunnels was cooled, resulting in a decrease in the temperature of the tunnel air and an increase in relative humidity above the normal level, which sometimes reached 95 %.The value of the relative humidity of the tunnel air in underground tunnels of deep underground utility company “Kiev Metro” depends on the temperature and absolute humidity of the tunnel air, the temperature of the rim of the walls of the tunnels and the presence of possible additional sources of moisture in the tunnels.The decrease in the relative humidity of the tunnel air during the implementation of the assimilation method by increasing the air exchange SCB-1 in the line to the station. m. Khreschatyk with a length of 1400 m due to the installation of an additional ventilation unit in the bypass tunnel (in the area of PK09 + 40) and means of directing the air flow into the tunnel can lead to an increase in the flow rate of tunnel air to 30 and 26 kg/s, respectively, while the relative humidity will decrease by 5 %. To implement this method, it is necessary to expend an electric power of 40 kW.When implementing the method of drying tunnel air with an additional air drying machine located in the bypass tunnel, it is possible to reduce the relative humidity by (12...14) % and to ensure compliance with the standard humidity of 75 %. However, the implementation of this method is energy-intensive in comparison with the implementation of the assimilation method (increase in air exchange), since the necessary expenditure of electric power for drainage is about 212 kW.According to the results of the study for utility company “Kiev Metro”, a method of heating tunnel air with an additional heat gun installed in the bypass tunnel with a 40 kW heater based on electric heating elements is recommended, which will lead to heating of the tunnel air with a simultaneous decrease in relative humidity by (7...11) % warming the soil layer around the tunnel and avoiding its cooling in the future. The practical implementation of the method for heating tunnel air requires an electric power cost of about 60 kW." @default.
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- W3094093536 date "2020-06-04" @default.
- W3094093536 modified "2023-09-23" @default.
- W3094093536 title "ANALYSIS OF EFFICIENCY OF METHODS DRYING OF THE METRO POLYETH AIR WITH THE EQUIPMENT IN THE BYPASS WAY" @default.
- W3094093536 doi "https://doi.org/10.18664/1994-7852.190.2020.213923" @default.
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