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| Re: London's five-year plan (9032) | |||
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Re: London's five-year plan |
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Posted by David Fairthorne on Thu Oct 14 01:07:07 2004, in response to Re: London's five-year plan, posted by WMATAGMOAGH on Mon Oct 11 23:36:54 2004. How do they plan on air conditioning the trains on the Underground?I found this answer at Always Touch Out: "The deep tube lines are the Bakerloo, Central, Victoria, Waterloo & City (all belonging to one PPP contract), Jubilee, Northern & Piccadilly (belonging to a separate PPP contract). Proper air conditioning of trains and underground stations on these lines is so difficult it would be prohibitively expensive. This is because there is no easy way of dissipating heat from air conditioning units - the tunnels (the oldest deep tube tunnels in the world) are generally too small. The small size of the tunnels also means that air conditioning units cannot be fitted on the similarly-sized trains, unlikely more modern air-conditioned tube systems such as Singapore. The geology of the area also means that some tube lines are insulated by the clay they were tunnelled through. However, the Mayor ran a competition last year with a £100,000 prize for someone who could come up with a workable method of significantly cooling the deep tubes. As a result, London South Bank University is now working on a pilot project with London Underground to use the thousands of litres of ground water which must be pumped out of the deepest parts of the system every day. The pilot system at Victoria station's Victoria line platforms involves using water pumped from the nearby underground River Tyburn. 200 litres per second will be drawn from the river and pumped between the platforms. Fans will draw hot air from the platforms across the pipes, cooling the air and heating the water. The heated water will be pumped out to the Thames where it will cool rapidly. The air cooling effect is predicted to be about 5°C." |
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