How does the ventilation of metro Rail take place?

The open system congested ventilation shall be via a ‘push-pull’ effect where tunnel vent fans behind the train are operated in supply and tunnel vent fans ahead of the trains are operated in exhaust mode. Nozzles or booster (jet) fans will be used to direct air into the desired tunnel, if required.

Which company AC is used in Delhi Metro?

Lloyd specialises in the design of energy-efficient refrigeration systems for packaged air conditioning units to be used on metro trains, which in the past has included Delhi Metro Rail Corporation (DMRC) and the Kolkata Metro project.

What is tunnel ventilation?

Tunnel ventilation is a system where exhaust fans are located at one end of the house and two large openings are installed at the opposite end. Air is drawn through these openings, down the house, and out the fans, like a wind tunnel (see Figure 1). Tunnel ventilation is a type of exhaust system.

Are subway tunnels ventilated?

Metro systems consist of underground stations as well as tunnels, which connect these stations. Similar to rail tunnels, the ventilation system in the tubes is mainly used to transport smoke gases out of the tunnel in case of fire.

How are underground stations built?

With the cut and cover method, the pavement of the street is removed, and a hole for the subways and stations are dug and built. Afterward, the street is put back into place, leaving the tunnel underground. Most of the New York Subway system was built utilizing this method.

How are tunnels built?

There are three basic types of tunnel construction in common use. Cut-and-cover tunnels are constructed in a shallow trench and then covered over. Bored tunnels are constructed in situ, without removing the ground above. Finally, a tube can be sunk into a body of water, which is called an immersed tunnel.

Is there camera in Delhi Metro?

NEW DELHI: The driverless trains of Delhi Metro will offer more reliability due to reduced human intervention, and are equipped with hi-tech cameras and obstruction sensing devices to ensure safety of passengers, officials said on Monday.

What are methods of ventilation of tunnel?

Mechanical Ventilation System in Tunnels Mechanical ventilation system employs mechanical devices like electric fans, exhaust, and blowers, which serves the function of removing the exhaust gasses within the tunnel and help in blowing fresh air into the tunnel.

What are the different methods of ventilation in tunnels?

A number of alternative tunnel ventilation systems are available, including transverse, semi-transverse and longitudinal. For short tunnels that are 3 km or less in length, longitudinal ventilation systems are generally preferred due to their modest construction cost.