Russell,

On Fri, 11 Feb 2005 15:13:24 +1300, Russell McMahon 
wrote:

> Consider solar air heating into a rock or water 
reservoir.

The Centre for Alternative Technology, near Machynllyth 
in Wales, did an experiment using an underground water 
tank for heat storage - I don't know if the write-up is 
still on their site (http://www.cat.org.uk) but I d 
remember it wasn't as successful as they'd hoped, and 
they discontinued it after a year or two.  I seem to 
remember the biggest problem was insulation - they had 
*a lot*, but it wasn't enough.  They used a drip-roof to 
collect the heat, I think - how would you transfer the 
heat from hot air to the water?  That seems to me rather 
trickier than the other way round.

Cheers,



Howard Winter
St.Albans, England


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