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Why not cover a 1 litre bottle in solar panels
and use the electricity to cool the water
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.
||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
||The first thing I thought of was peltiers. You should incorporate that in the idea text [+].
||I've got a Peltier effect fridge that runs off a car battery.
||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.
||This never worked for me, but mine was just a little pelty. I'll see if maybe peltier is better.
||You'll need a lot of power for good cooling. Not that this means it won't work. I like it.
||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,
||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.
||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.
||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.