UNDERGROUND RAILWAYS VENTILATION ARRANGEMENT
Station ventilation (in the station space), station-to-station block (i.e., between stations), and dead-end ventilation shafts (for ventilation of reverse and dead-end tunnels) are created to provide ventilation in underground tunnels. All of these facilities operate in the common automated ventilation system of an underground.
In summer, the air is supplied through station shafts and is exhausted from underground station-to-station block shafts. In winter, on the contrary, the air is supplied through station-to-station blocks and is removed through station ventilation shafts. In such operation mode in winter, the air warms up as it passes through the tunnel toward the station.
A ventilation vault through which air is taken in/out for ventilation of underground tunnels. Also, ventilation vaults provide access to ventilation units, ACS systems, and underground tunnel for technical staff to perform maintenance and regulatory works.
VOM ventilation units. As a rule, they are duplicated to ensure uninterrupted ventilation of tunnels.
Electrical equipment room. ACS systems, ATS cabinets, and other electrical equipment automation cabinets of a tunnel are located here.
Control center. It is designed for visualization and remote control of electrical equipment of the monitored underground zone. Remote start and ACS systems` control can be performed from a control center.
Trains create a so-called "piston effect" as they move through the tunnel, forcing airflow through the underground tunnel. But this amount of air is not enough to provide an optimal microclimate in underground stations and tunnels.