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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.
[link]
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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. |
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The first thing I thought of was peltiers. You should incorporate that in the idea text [+]. |
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I've got a Peltier effect fridge that runs off a car battery. |
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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. |
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This never worked for me, but mine was just a little pelty. I'll see if maybe peltier is better. |
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You'll need a lot of power for good cooling. Not that this means it won't work. I like it. |
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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... |
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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. |
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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. |
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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. |
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