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John · May 29th 04, 07:14 PM posted to uk.transport.london

In article ,
writes
In article ,
(John) wrote:

In article , Dave Arquati
writes
John wrote:
In article , M J
Forbes
writes

"Gary Jenkins" wrote in message
e.com...

During the hot spell last week the announcer at Westminster Tube was
advising passengers to carry bottled water with them.

As far as I know the tube has been operating for over 100 yeras
without any seriious incidents of dehydrated passengers. Have the
operators now lost confidenc in their ability to get people to their
destination within a reasonable time?

For the last two summers, bottled water was being handed out at many
central
tube stations free of charge in the mornings, although I strongly
suspect
that this gesture was entirely at the expense of
Volvic/Evian/Whoever,
rather than being a LU or TFL-sponsored thing ....

Matt

Last year our mate Ken made lots of noises about requiring TfL to
get on
with cooling the tube, etc. It all seems to have gone quiet - anyone
know whether any progress has been made?

John

One of his manifesto points is to have air-conditioning installed on
the new subsurface fleet, thus bringing it to at least four lines
(assuming the ELLX will use other, mainline stock - if it ever gets
built).

So what options exist?

1) air con trains - where does the heat go?

2) cool tunnels - heck of a lot to cool

3) cool stations - cools tunnels as well...

Thoughts

--
John Alexander,

The 1995 stock(Northern)(and I assume the 1996 stock (Jubilee)) have
proper air conditioning in the cab, which has no opening windows or doors
- or shouldn't have when the train is in motion.

Given the fact that they can't even maintain these - instead of an 18
degree temperature when the air is chilled, the unit either recycles the
warm air in the cab and sometimes actually heats the air - I cannot see
them actually being able to do anything full scale on the train.

Roger
(my reader sometimes loses mail/newsgroup messages
- if you think you should have had a reply/comment,
please e-mail me again. Ta!)
I agree, the idea of cooling the trains on the tube lines is ridiculous
until you extract heat from the stations and tunnel system first. The
sub-surface lines seem an easy target since, at least for part of their
journey, the heat can be exhausted to the atmosphere. However, there are
quite long sections in tunnel and I can see them (and the stations
principally in them as well) getting a lot hotter.

What is the problem with having a heat pump to suck heat out of a deep
tube platform to a liquid (water?) and then to pump the liquid to the
surface and chill the liquid there for return to the platform? Any
refrigeration engineers out there?
--
John Alexander,