This is a plan for a pollution-free, non-electric refrigerator. All it requires is that you fill the small wells with water periodically and keep it in a dry place with reasonable air circulation. It is perfect for developing countries where electricity is unavailable or expensive. It works on the same principle are the zeer pot.
The refrigerator must be made of a porous clay, stoneware, or similar material that water can slowly seep through.
The wells and (optionally) the lid are filled with water. On the lid, it simply evaporates, cooling the lid and therefore the inner container. In the walls, it soaks through the walls and slowing evaporates on the outside, thus cooling the container walls. The inside of the container must be sealed with some type of waterproof glaze, in order to prevent water from seeping into the inner chamber and spoiling whatever is stored there. The lid should be completely sealed, in order to prevent water from leaking into the chamber.
Ideally, there can be a narrow channel along the top that runs between the wells. This would allow water to flow from one well to another if one overflowed. This would allow you to simply fill one well until all the wells were full.