Half a croissant, on a plate, with a sign in front of it saying '50c'
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Solar Cooled Drink

 Solar powered cool water bottle
  (+4)
(+4) 		  [vote for,
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Why not cover a 1 litre bottle in solar panels and use the electricity to cool the water using a thermoelectric module (ed. - Peltier Effect). That way, the stronger the sun, the more it cools, and no need to carry a whole cool box.
—alistairwest, Jun 27 2005

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       I might have got it wrong but I was planning on using the Peltier-Effect. I thought these devices are called thermo- electric modules. And evaporating the water would involve exposing the liquid to the elements and would also have very limited value with drinks other than pure water.
—alistairwest, Jun 27 2005
   

       The first thing I thought of was peltiers. You should incorporate that in the idea text [+].
—contracts, Jun 27 2005
   

       I've got a Peltier effect fridge that runs off a car battery.
—DenholmRicshaw, Jun 27 2005
   

       Thanks C, it's added. DR - I was also thinking about using an existing Peltier effect fridge and powering it from a solar panel on a cord. That way you could leave the fridge under your parasol while leaving the panel in direct sunlight.
—alistairwest, Jun 27 2005
   

       This never worked for me, but mine was just a little pelty. I'll see if maybe peltier is better.
—bungston, Jun 27 2005
   

       You'll need a lot of power for good cooling. Not that this means it won't work. I like it.
—Madcat, Jun 28 2005
   

       Good point Madcat, my rudimentary calculations working within a budget of £10-£15 came up with approx 1 degree C of cooling per hour for a litre of water. Could probably increase to around three degrees with an increased budget, hmmm...
—alistairwest, Jun 28 2005
   

       Under the same conditions, how fast is ambient heat raising the water temperature? This would work better if the water was in a thermos flask with solar panels on the outside.
—david_scothern, Jun 28 2005
   

       For the sake of my (very rough) calculations I already assumed a pretty good level of thermal insulation. SInce I found the maths far too difficult to do, I turned to the internet and thought that a decent thermos flask seemed to equalise about 2 degrees an hour with a temperature differential of 25 degrees.
—alistairwest, Jun 28 2005
   

       Ooh, I'm definitely going to bake this (well, the annos). I've been thinking of getting a battery powered fridge/coolbox for a while and solar would work well here (Middle East). Yay, soldering.
—marklar, May 28 2007
   
      
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