A Plan for London - 3

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London Underground (The Tube)

Suggestions and Comments

Contributions from our readers are welcome. Comments

Pipe in Daylight.

Clearly the approach needs to be multi-factorial and one source of heat generation has to be lighting. Could not a system of light distribution from the surface using fibre-optic cables be used to replace all the fluorescent tubes? Also the installation of video-board advertising in stations seems insane. These panels must generate hugh amounts of heat and are totally superfluous. ~ Arthur Duce 18 Jun 2008

Make the Trains 'SLIPPY'

- Avoid some of the heat by making the trains more streamlined. Roger Groombridge 27th January 2008

Use Rheostatic Braking

- One of the main reason that the Underground is so hot is that the trains use Rheostatic braking, i.e. the trains use the motors to generate electricity which is fed into resistors which dissipate the energy as heat (like an electric heater). Regeneration into the power supply is not very effective as the trains generally accelerate or brake at the same time, using electrical power all together and then generating power together. One solution I read about was using excess (or unusable) generated electrical energy to spin heavy flywheels, which would then be used to generate electricity when the demand returned (i.e. when the trains were accelerating). Whatever happened to this proposal - it seemed very sound to me. -- Stay cool, Griz - Stewart Grisman email stewart.grisman(at)uk.transport.bombardier.com

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In emergencies large mobile refrigeration plants vehicle-mounted or in containers. parked at stations or vent shafts - DE - May 2007

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Unused areas of the Underground can in some instances be used as heat sinks. Long tunnels (there are many miles of such tunnels available) can have tunnel ventilating air sourced through them to form "coolth tubes" This is a passive cooling technique. - DE - 2007

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At terminals and perhaps at other points in the system trains could charge up with liquid nitrogen or coolant liquid to fill tanks installed under seating and in other unused 'volumes' in the train. - DE - August 2004

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Spraying the cars with water before and after entry to the tunnels is another suggestion. - DE - September 2004

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When the trains are stationary in the platform alternate open doors could be the target for a directed stream of cooled air. The door will change over at successive stations. - DE - September 2004

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Selective coatings applied on the outside surfaces of the carriages would help to dissipate the heat, There are smart materials available to achieve this (Tabor et al). - DE - September 2004

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More effective use of the relative difference of air velocity past the moving vehicle. Someone suggested open carriages???? - DE - September 2004

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An interesting website has had a debate running on the subject. www.halfbakery.com contributors floridamanatee and jonthegeologist have come up with some very good ideas.

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