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Make your own Fridge (Zeer)

The Zeer or Pot in Pot refrigerator is an electricity free invention can keep food cool and fresh by the power of evaporation. It was invented in Nigeria by Mohammed Bah Abba in 1995. However there are reports that the technology was used in Ancient Eygpt.

It works using what's known as evaporative cooling. As the water evaporates due to the sun, the water takes heat from the inner pot and makes it cooler.

• To make your Zeer you need two clay pots. One needs to be able to fit into the other with a gap of about 2cm. Add a layer of sand to the bottom of the large pot. Place your smaller pot on top pf the sand. The tops of the two pots should be level. You may need to add or take away sand to get them flush
• Once that's done fill the sides right up to the top with sand. Now add water to the sand. Keep adding until it can't absorb any more
• Now add a damp cloth that covers only the small inner pot. It's important it doesn't cover the sand as this will stop the evaporation.
• Now just add foodstuff and place in the sun. You wll need to add water twice a day to prevent it from drying out and becoming hot rather than cold.
  

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