"Europe wastes more heat than it uses to keep buildings warm. Now projects across the continent will tap everything from subways to sewers to keep homes cosy
TAKE the escalator down to platform level at any deep London Underground station and a wave of warm air wafts over you. Dug in the 19th century, the poorly ventilated tunnels were not designed for today's train and passenger volumes, trapping heat from engines, brakes and the bodies of London's commuters. It is not just unpleasant on a summer's day – that heat represents a huge amount of energy going to waste.
And so it was announced last month that some of this energy will be channelled to nearby homes. It is one of five such projects in the works. Urban heat sources across European cities, such as waste water from baths and washing machines, could soon be tapped to cut heating bills and help Europe hit its carbon emissions targets......"
For the rest of the article see:http://www.newscientist.com/article/mg22029464.600-how-heat-from-trains-and-sewers-can-warm-our-homes.html#.UqHKs_RDuIo
