Oh no Dede! This subject heating-insulation / storage-and-phase shift-geo-thermal-in-the-soil-t10470.html it is that of Obamot that I personally split from another!
It does not speak SPECIFICALLY about the Drake Landing Solar Community solution!
I insist on the fact that it is necessary to make a specific one ... really it is for "our good" to all!
Also I propose to admire and seek to improve it in a positive way this functional solution since 2007, which stores the heat of the summer underground to heat 52 pavilions winter, very cold, 1000m of altitude to the south from Cagliari to Okotoks, Alberta, Canada with a continental climate at the latitude of northern Belgium.
The summary is in French:
https://www.econologie.com/fichiers/par ... mrk29Z.pdf
the site in English:
http://www.dlsc.ca/how.htm
At any moment we can see the operation, the weather, the sun, the level of stocks, etc ...
http://www.dlsc.ca/how.htm
with much less sun on this day than on Paris, and still need to heat the houses !!
photos of the sky
http://www.dlsc.ca/photos/2007/septembe ... _index.htm
under the snow :
http://www.dlsc.ca/photos/index.htm
if you doubt you can walk in street view of google map without leaving your home:
Do you have precise coordinates of all their subdivisions?
on google map type:
drake landing Okotoks, Alberta, Canada
or:
drake lahttp: //maps.google.fr/maps ct = resetnding? Okotoks, Alberta, Canada
http://maps.google.fr/maps?num=100&hl=f ... CCAQnwIwAA
and google street view photo of solar panels and houses of Drake lading solar community on Drake Landing Common next to Drake landing road on Milligan Dr towards South East in the center of Okotoks Alberta Canada
This is a successful Canadian technology research project subsidized (infinitely less than nuclear) !!
In numbers :
52 2 Canadian pavilions floors of approximately 150m2 optimized to save with solar individual hot water (covering 60% of requirements completed by the winter gas) with large garages and 7,3mx7,3m 30m2 (800 from 2 on 2m52) of thermal plane solar collector on the roof of the garage, a collective management center with 2 buffer storage 120m3 balls (4,6m3 by house), and storage of heat in 144 15cm holes diameter 37m depth to 2,25m each others, on diameter 35 m (cylinder of 35 by 35 + 2m of depth isolated on the surface on 2m), holes grouped in 24 groups of 6 each.
So there is 97m drilling for each of the 52 pavilions, a shallow well, dug in Canada in 1h30 in the rock for 2000 to 3000 € according to Alain G.
So houses, pipes, balloons and sensors are much more expensive than drilling.
The original essentials are underground storage, in fact, a Canadian well heated in the summer for the winter and the rest can be different.
This storage uses the slowness of the diffusion of heat that slows down as the square root of time:
http://fr.wikipedia.org/wiki/Conduction_thermique
as this slowing down on 3m in about 4 months, distance following the ground to a factor of about 2.
See as well :
http://fr.wikipedia.org/wiki/Diffusivit%C3%A9_thermique
http://de.wikipedia.org/wiki/Temperatur ... %A4higkeit
So you have to accept losing free summer heat, because otherwise with the usual methods of insulated water balloons, much more expensive than land, there will not be much left over after 4 months.
The size of the storage depends on the insulation of the house, the climate, and the solar heat captured in winter as an extra.