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First passenger service journey for LUL 09 stock
"Tom Anderson" wrote in message
rth.li On Thu, 23 Jul 2009, Peter Masson wrote: "Tom Barry" wrote If they'd only had aircon... Among the problems with aircon on the tube lines is - where do you dump the heat? Presumably on, say, the Central or Piccadilly lines it would be possible to devise a system whereby the heat was retained on the train until it got to the open air, and then dumped, but Victoria Line trains stay underground all the time they are in service. No use cooling the trains if you just heat the tunnels even more. You'd have to install a fake open air. By which i mean some point on the line where trains could stop and offload their heat - some apparatus they sit inside which blows a gale of super-cooled damp air (or even water) into their heat exchangers, and sucks the warmed exhaust out again. You wouldn't want to do it in passenger service, but if you could build ten minutes into the schedule at one end, it could be done during turn-around. Admittedly, this would involve changing the Victoria operating principle quite a bit, but at least it's technically feasible. Ish. I think it makes a lot more sense to just take more heat out of the stations and maybe the tunnels as well. That means more surface ventilation fans running (which is think is already happening) and some sort of additional cooling, such as the plan to use heat exchangers with the cold ground water being pumped out. That way, the passengers in the stations benefit as well, and you don't need to complicate the already cramped trains any more than they are already. |
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