In article , Richard J.
writes
Andrew P Smith wrote:
In article , Phil Richards
writes

On the subject of the tube, the "In this hot weather" posters mention
that "long term solutions are being looked in to. I know the
engineers all seem to respond with the usual "Oh no, we can't
possible do that" statement as soon as the subject of air
conditioning on the tube is uttered, but perhaps LUL can up date us
on what these "long term solutions" exactly are.

The tube has 2 issues when it come to air con.

1. The stations

2. The trains
snip

On trains you have to site the units somewhere. On stock on the Picc
and Northern etc it may be difficult to fins the space - possibly
easier on the Met style stock where there is more space. However, as
with the stations what do you do with the heat and moisture to
disperse it? On open sections of track it wouldn't be a problem, in
tunnels it would!

The Singapore Metro has air-conditioned trains and stations. Do you know how
the heat and moisture from the trains is handled? Is it just dumped in the
stations for the station aircon to deal with?

I imagine they designed the system with ac in mind. When the underground
was built, it was never considered and may not have even existed then!

In New York City, the trains have ac and they dump the heat into the
tunnels which are well vented.
--
Andrew
Electronic communications can be altered and therefore the integrity of this
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Andrew P Smith writes
In New York City, the trains have ac and they dump the heat into the
tunnels which are well vented.

Not only are the tunnels much bigger than the tube but they are also
much shallower - so that the many gratings in the roadway can be used to
vent hot air.

--
Dave

In New York City, the trains have ac and they dump the heat into the
tunnels which are well vented.

Not only are the tunnels much bigger than the tube but they are also
much shallower - so that the many gratings in the roadway can be used to
vent hot air.

I really know next to nothing about air-con systems, but I take it the
moisture in the air is condensed somewhere and collected as water - am I
about right?

Why not, then, have a system of pipes on each train, and a big tank at the
end to collect the water, which would be emptied out at various times during
the day (whilst stopped at stations - surely they could implement such a
system?).

The heat, of course, is another issue.

Peter

In article ,
AstraVanMan writes

I really know next to nothing about air-con systems, but I take it the
moisture in the air is condensed somewhere and collected as water - am I
about right?


Correct.

Why not, then, have a system of pipes on each train, and a big tank at the
end to collect the water, which would be emptied out at various times during
the day (whilst stopped at stations - surely they could implement such a
system?).


Where would you site the dehumidifier? It's not the size of a matchbox
for the amount of work required. Where would the pipes run between the
carriages? You want to build in infrastructure to empty water tanks in
platforms? Who's job would it be to empty the tanks?

Myriad of problems fitting it to existing stock. I saw start with the
stations - at least there would be a blast of cold air into the carriage
at each stop and the technology is more or less off the shelf. Still
doesn't get round the space problem I mentioned earlier.

The heat, of course, is another issue.

Sure is........
--
Andrew
Electronic communications can be altered and therefore the integrity of this
communication can not be guaranteed.
Views expressed in this communication are those of the author and not
associations or companies I am involved with.