On Fri, 16 Jul 2004, Ted Maul wrote:

The London Underground are investigating the possibility of using water
to cool down underground stations.

It's an interesting problem, the cooling. It's easy to pump heat out of
the carriage into the tunnel (that's normal air conditioning), and that'll
work fine when the trains are above ground, but it's rather harder to get
heat from the tunnel to the outside. Three options spring to mind: pump
warm air out (which means moving a lot of air), transfer the heat into
water and pump that out (which means moving a bit of water, but
transferring a lot of heat), or transfer the heat into some kind of
reservoir on the train and then dispose of it when outside (which means
either pumping the heat out, or just using water to hold the heat and then
dumping it, neither of which is going to be that easy).

Anyway, interesting as the problem is, i'd be even more interested in a
solution!

And are we going to get dehumidifers as well? And perhaps filters on the
Northern line ...

tom

--
I know you wanna try and get away, but it's the hardest thing you'll ever know