"Roy Stilling" wrote in message
...

I posted a comment to the Mayors air-con competition on the LU website
the other week asking why, as their website says they pump thirty
million litres of water a day out of the system due to the rising
water table, that water can't be used to transfer excess heat from
aircon out too.

If that water is below ambient, then they could use it to spray the incoming
air to reduce its temperature, or to reduce the temperature of the outgoing
air. One or two little problems in the tunnels due to conductor rails, of
course. That could be solved by a system of inlet and exhaust ducts and
fans, whereas at present they use the trains as pistons in the close-fitting
tube tunnels to provide ventilation.
--
Terry Harper, Web Co-ordinator, The Omnibus Society
http://www.omnibussoc.org
E-mail:
URL: http://www.terry.harper.btinternet.co.uk/