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Cooling the Tubes

I suggest the stations be sealed and then pressurized with air conditioners near the surface. Exhaust vents, containing heated outgoing air from the stations, can be directionally drilled. The system could be balanced by installing turbines on a particular shaft to draw or damper air flowing through the system.

It's the simplest solution Cooling lines of water would be unreliable and too costly to maintain. Regards, Michael Lee 9th July 2011

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

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Underground coal mines cooling system

Hi, This is Jim Yu from Chicago, IL USA. We are looking for good cooling system for underground coal mines (more than 1000 meters below surface). Could you please let me know which company can offer cooling system for underground coal mines (under 1000 meters) ? Do you know which company have those kind of product and services to resolve this issue ?   Thank you, Jim Yu  16/08/2005 (Ref:001)

If you wish to contact anyone posting on the board please email us quoting the reference and we will pass it on. 

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Date:   Wed, 14 Mar 2007 8.18AM
From: Brian Lee

Subject:   Solutions to cooling the London Underground
In order to effectively cool the entire London Underground system, we have to focus on three areas. These are the running tunnels, the stations and the trains.
 
To cool the running tunnels
Install pipes carrying chilled water/coolant between the rails or along the tunnel walls (like the Channel Tunnel). The coolant can be the Thames River water. Cooling stations can be located at regular intervals along the line to suck up the coolant and re-chill it.
 
To cool the stations
Since it is easier to cool the ticket halls, why not install air-conditioners in the ticket halls and direct the cooled air into the platforms by the means of air ducts or the escalator shafts?
 
Cool air can be blasted through openings in the platform floor itself or along the track. Exhaust air on the other hand is sucked out of the station through openings in the ceiling.
 
Chilled water can be piped along the platform and escalator tunnel walls.
 
Also, since plants (as in trees and flowers) are able to absorb heat for transpiration, major planting can be carried out along platform walls or in ticket halls. However, water vapour from the plants must be released into the atmosphere. This can be done using small ventilation gaps along the platform ceiling.
 
To cool the trains
New tube stock should be fitted with regenerative brakes. Water can be sprayed onto the rails or wheels of the trains either as they enter the station or after they have stopped. This is to absorb the heat produced by friction breaking. However, there may be drastic differences in the braking quality of the train if the water is sprayed onto the wheels as the train is braking.
 
Referring to a suggestion on spraying the trains with water before they enter the tunnel, why not spray them when they are in the station. The sprays can be located on the opposite side of the platform (tunnel wall) and will only be activated when the train has come to a complete stop. This will prevent passengers from getting wet. -- Brian Lee

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<dampers>

Another contributor's idea.

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Subject: FW: I'm no engineer...

... but I am a regular commuter on the stiflingly hot London Underground.

I was thinking about the hot topic today on the way to work - well dreaming of cooler days in fact - and I remembered how they were able to clean up the river Thames. They use a boat called The Bubbler which pumped oxygen into the water - hence helping life thrive again

That led me to thinking about adding an extra carriage to the back of all tube trains (or just a few) or have a dedicated train that could ride through the tunnels churning out refrigerated air. As I understand it, the trains then push this air around the entire tube system and could, in theory?, help cool things down.

Is this a ridiculous and naive idea? Feel free to shoot it down if you like. I'd just like to know how plausible or implausible it is.

Thanks - Josh Haines josh.haines(at)talk21.com - 23/05/2007

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Hello,

I am writing a book about heat pumps, and was trying to assess the issue
that if everyone had a ground source heat pump,- would the ground be
exhausted of heat? The answer seems to be a marginal yes, in densely
populated areas.

I had added a sentence to the book saying that London, for example, may
have accessible ground some 10°C above the temperature of ground in
rural areas.

This guess could be about right, but I did not realise that cooling was such a problem until I read your website.

I am coming to London in September, and was keen to bring my thermometer
and see what temperature various stations are.

It strikes me that areas close to underground networks could be used as
collectors for heating using heat pumps

It also strikes me that tunnel cooling/ useful heat extraction could
take place only in winter. e.g. the tunnels themselves would be the heat
store.

Realistically, I guess its a matter of there being a need for the heat,
and this may not happen until gas supplies start to dwindle, and when we
realise that electric heating is too wasteful.

For my book, it will only be a sentence or two, but I will certainly
pose the possibility of using this significant thermal resource.

Best wishes

John. johncantor(at)heatpumps.co.uk

John Cantor Heat Pumps Ltd
Ty Pendre
103, Heol Maengwyn
Machynlleth
Powys
SY20 8EE
01654 700115 07894 431317
www.heatpumps.co.uk

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