DELHI METRO RAIL CORPORATION LIMITED

दिल्ली मेट्रो रेल कॉरपोरेशन लललमटेड

SUMMER TRAINING IN DMRC

Presented By:Asim Kumar GhatakMechanical Engineering (7th

Sem)1409140044

A PRESENTATION ON

CONTENTS

1. ECS (ENVIRONMENTAL CONTROL SYSTEM) AIR HANDLING UNIT (AHU) CHILLERS COOLING TOWERS VENTILATION SYSTEM

2. TUNNEL VENTILATION SYSTEM (TVS)3. FIRE FIGHTING SYSTEMS4. UNDERGROUND STATION PLATFORM LEVELS

Environmental control system

The environmental control system(ECS) of Metro provides air supply, thermal control for the crew and passengers. Smoke detection and fire suppression are also commonly considered part of environmental control system.

Environmental Control System consist of1. AIR HANDLING UNITS (AHU)2. CHILLERS 3. COOLING TOWERS4. VENTILATION SYSTEM

AIR HANDLING UNIT (AHU)

AHU

An air handler, or air handling unit (often abbreviated to AHU), is a device used to regulate and circulate air as part of a heating, ventilating, and air-conditioning (HVAC) system. An air handler is usually a large metal box containing a blower or centrifugal pump, heating or cooling elements, filter racks or chambers, sound attenuators, and dampers. Air handlers usually connect to a ductwork ventilation system that distributes the conditioned air through the building and returns it to the AHU.

Cross Section Of AHU

Drip Pan

Centrifugal pump

Cu tubes with fins

Air Filter

CHILLERS

A chiller is a machine that removes heat from a liquid via a vapour-compression. This liquid can then be circulated through a heat exchanger to cool equipment, or another process stream (such as air or process water). As a necessary by product, refrigeration creates waste heat that must be exhausted to ambience, or for greater efficiency, recovered for heating purposes.It works on the same way as vapour compression refrigeration cycle.

Hot water from AHUCold water from chiller

To AHU

Hot water from EvaporatorCold water from Cooling Tower

Working of Chillers

Cooling Towers

A cooling tower is a heat rejection device that rejects waste heat to the atmosphere through the cooling of a water stream to a lower temperature. Cooling towers may either use the evaporation of water to remove process heat and cool the working fluid to near the wet-bulb air temperature or, in the case of closed circuit dry cooling towers, rely solely on air to cool the working fluid to near the dry-bulb air temperature.the main types of cooling towers are natural draft and induced draft cooling towers.

Working of Cooling Tower (crossflow design)

Ventilation System

Track Way Exhaust Fan (TEF)

• Track way Exhaust Fan is required to suck the air of platform level through UPE & OTE duct and send this air to AHU where air is cooled and filtered .

• TEF rotates in a single direction and has an axial flow of air through it . • TEF (about 08 to 12) in numbers are located in each station.

Under Platform Exhaust (UPE) Over Track Exhaust (OTE)

Tunnel Ventilation System (TVS)

• This system is incorporated for the emergency condition when there is a fire in tunnel or fire in train inside tunnel.

• Huge size of fans are installed at each station at both the extreme ends of station from where tunnel starts.

• These fans are having bidirectional feature for its rotation as per requirement i.e. the fan can rotate in either supply mode or exhaust mode

• These fans are always at the priority level for its operation.

• Direction of its rotation is decided as per the location of fire and if one station TVF is in supply mode another station where in between fire is there will run in exhaust mode for quick overcome on smoke and fire.

Piston Effect Due to Moving Train In Subway Tunnel

If tunnel length is > 1.5 Km , Boosters are used

FIRE SYSTEM It consists of

1. Fire Detectors– Located at various places of station as per layout

2. Gas Suppression– Inergen Gas (Argon 50%,Nitrogen 42% and CO2 8%) Cylinder located in ASS (Auxiliary

Service Station) rooms which operates automatically in case of fire.

Best feature – it doesn’t hamper life .

3. Hydrant Pumps—It is of different types as

--Main Hydrant Pump

--Standby Hydrant Pump

--Sprinkler Pump

--Jockey Pump

Jockey pump

A jockey pump is a small pump connected to a fire sprinkler system and is intended to maintain pressure in a protection piping system to an artificially high level so that the operation of a single fire sprinkler will cause a pressure drop will be sensed by the fire pump automatic controller, causing the fire pump to start.

• 2 tanks of 1 lakh litre each is used in Fire fighting located in ancillary building

Firefighting Equipment :

Underground Station Levels

There are Four Levels In An Underground Metro Station1. Ground Level: Parking, Lift, Escalators, Staircase to Concourse Level2. Concourse Level:

Paid Area: Staircase down to Platform, Lift, etc.Unpaid Area: Access to Fare Office, Ticket Window, X-Ray MachineAFC (Automated Fare Collection) Gates are connecting area of paid and unpaid area

3. Platform Level: Lifts, Staircase, Escalators, FHC(Fire Hose Cabinet) etc.4. Undercroft Level: Electric Lines, Services Of Drainage (Seepage & Sewage), UPE Duct

References

http://www.delhimetrorail.com/

https://en.wikipedia.org/wiki/Delhi_Metro

https://www.google.com

Study materials provided by DMRC

THANK

YOU!