>  and ponder ways to store the heat for the following winter

Salt concentration-gradient ponds seem to work over any months.
Example given in one paper of annual cycle in India.

Page 290 on gives an excellent description
Fig 8.3 sjows annual cycles in an Indian pond.

        http://books.google.co.nz/books?id=3DO8IMS-jq6skC&pg=3DPA292&lpg=3D=
PA292&dq=3Dsalt+concentration+gradient+thermal+storage&source=3Dbl&ots=3DRv=
wEPFZhwp&sig=3DVeECi8bQ5edj-fsmuRO1QJRWDT4&hl=3Den&sa=3DX&ei=3DZKYsT-LNLISr=
iAf9m7zhDg&ved=3D0CEoQ6AEwBA#v=3Donepage&q=3Dsalt%20concentration%20gradien=
t%20thermal%20storage&f=3Dfalse

Sandia labs

  http://www.nrel.gov/csp/troughnet/pdfs/jpacheco_thermocline.pdf
 Paper
          http://infohouse.p2ric.org/ref/22/21032.pdf

Book,good. P34

   http://books.google.co.nz/books?id=3DIBLmmnea5sQC&pg=3DPA34&lpg=3DPA34&d=
q=3Dsalt+concentration+gradient+thermal+storage&source=3Dbl&ots=3Dqe45bj5yR=
g&sig=3DC40Y4DaAOsT9EhfkB-wunqWccrM&hl=3Den&sa=3DX&ei=3DZKYsT-LNLISriAf9m7z=
hDg&ved=3D0CF0Q6AEwCA#v=3Donepage&q=3Dsalt%20concentration%20gradient%20the=
rmal%20storage&f=3Dfalse


Wikipedia
           http://en.wikipedia.org/wiki/Solar_pond

Solar thermal

    http://www.green-trust.org/solarpond.htm

CEM El Paso

    http://research.utep.edu/Default.aspx?alias=3Dresearch.utep.edu/cerm

US DofE,

http://www.eere.energy.gov/basics/renewable_energy/thermal_storage.html



http://www.nrel.gov/csp/troughnet/pdfs/jpacheco_thermocline.pdf

         http://www.eere.energy.gov/basics/renewable_energy/thermal_storage=
..html

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