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The pot-in-pot refrigerator, also known as a Zeer الزير in Arabic, is a refrigeration device which keeps food cool without electricity by using evaporative cooling.

It is constructed by placing a clay pot within a larger clay pot with wet sand in between the pots and a wet cloth on top. As the water evaporates it cools, allowing food stored in the inner pot to be kept fresh for much longer in a hot, dry climate. It must be placed in a dry, ventilated space for the water to evaporate effectively towards the outside.

Evaporative coolers tend to perform poorly or not at all in climates with high ambient humidity.

Although Mohammed Bah Abba of Nigeria patented the device in 1995 and was awarded a Rolex Laureate (Rolex Awards for Enterprise) in 2000 for developing the “pot-in-pot preservation/cooling system”, the technology was known at least as early as the Middle Kingdom of Egypt, as evidenced by the hieroglyphic kbb, "to cool".

External links Edit

simple:Pot-in-pot refrigerator

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