compassrose
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Ran across this in Instructables.com.
It's a cheapish thing to make. At best, you could use it as a mini refrigerator (aim a small solar powered fan at it 24/7), at worst, you can keep your veggies and drinking water coolish. If using as a refrigerator, I would suggest you also invest in a thermometer to keep track of temps.
http://www.instructables.com/id/A-Practical-Zeer-Pot-evaporative-cooler-non-electr/A zeer pot is an evaporative cooler used in rural Africa and parts of the Middle East to keep vegetables fresh... When placed in a shady, breezy location, the evaporation of water off their outer surface chills the pot. If you have a good breeze all the time, or perhaps a small fan powered by a solar panel, the pot can get quite cold. Imagine that chill you get when you step out of a pool when the wind is blowing. Now imagine that wet wind chill going on all day. That's what the pot feels with a constant breeze. Unless the air is very dry and the pot is exposed to a constant breeze, they generally do not chill down as cold as a refrigerator, but they will usually keep vegetables fresh for most of a week compared to leaving them out. If you do have cool dry air and a constant stiff breeze, the interior of a zeer pot can chill down to around 40˚F.
It's a cheapish thing to make. At best, you could use it as a mini refrigerator (aim a small solar powered fan at it 24/7), at worst, you can keep your veggies and drinking water coolish. If using as a refrigerator, I would suggest you also invest in a thermometer to keep track of temps.