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Playing it cool
Batman55 wrote:
It seems odd that as LUL attempts to cool down the tube, it is introducing giant electric projectors at many stations, along with the illuminated moving panels on the escalators. The stories in Railway Herald this week, page 5 about cooling down, and page 6 about the heat producing equipment, seem to show a lack of joined up thinking! What might be more sensible is for equipment at every sub surface station to be reviewed and every heat producing item examined to see how its heat output could be reduced or eliminated. Every little bit might help! MaxB According to TfL, the heating effect arises because of the incremental heating and cooling caused by each passing train's energy consumption. The frequency of trains means the cooling of the tunnel walls is that little bit less than the heating, so over the years the ground heats up because it never gets a long enough break between trains. This is rather borne out by the original Bakerloo Line claim that it was an nice, cool way to travel in the heat of the summer - it was decades before the effect was realised. Presumably if you could shut the tube for a few years you could reverse it, but I can spot a couple of problems with that idea. I suspect, therefore, that things like lighting and electronics in stations (which are better ventilated than the tunnels anyway) are of minute benefit compared with reducing the heat produced in the tunnels by each train by a little bit. Indeed, one of the ideas being looked at is blowing cold air over the brakes of trains standing at stations, so they don't take the heat into the tunnel when moving off. Obviously this merely transfers it to the station, whence it can be removed somewhere. Regen braking has a place here, too, if you can shove the heat from the necessary resistors outside. Tom |
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