How To Make an Electricity-Free Refrigerator
This cool DIY project seems a clever solution for desert dwellers (or campers) who wish to preserve their fresh produce, as outlined by Gizmodo.com:
Conventional refrigeration does an incredible job keeping food fresh. But that technology hasn’t helped desert dwellers without steady electricity. A more recent development in refrigeration—the Zeer pot-in-pot refrigerator—only requires water, sand, and a hot, dry climate to preserve produce through evaporative cooling. Here’s how to make the simple gadget.
Materials and Tools Required
- two terra cotta pots with a 2-3 inch difference in diameter. The smaller pot should be glazed and preferably lacking a drainage hole. If the inner container is double glazed (on its inner and outer walls), non-potable water—say seawater—can be employed.
- a bag of sterile sand
- a square of burlap cloth large enough to cover the top of the inner pot
- a trowel
- 1. If your pots have drainage holes, plug them with a bit of cork, caulk, or other waterproof material. If you don’t, moisture from the sand will seep into the lower pot and immerse the stored goods or seep out the bottom of the larger one.
- 2. Put down a one-inch deep, level layer of sand in the bottom of the large pot. Set the smaller pot on top of that layer and center it in the larger one. Make sure that the smaller pot’s lip is even with the larger one’s.
- 3. Fill sand in around the sides of the of the two pots, leaving about an inch of space below the lip.
- 4. Pour cold water over the sand until it is thoroughly saturated. Put your food into the smaller pot. Cover that with a burlap cloth, also soaked with water. That’s it! Just be sure to refill the water regularly, about once or twice a day.