Pot-In-Pot Clay Refrigerator or zeer is a low cost traditional technology that can provide cooling refrigeration without electricity. The technology was perfected in Nigeria by Mohammed Bah Abba, between 1995-1997. It can extend the useful life of fruits and vegetables.
Spinach for example that would normally spoil in a day can now last 12
days. Tomatoes can last 20 days. PrincipleThe principle behind the Clay Pot-in-Pot Refrigerator is evaporative cooling. As the water in the sand between both pots evaporates, it moves to the drier outer pot, by the laws of thermodynamics. This causes a temperature drop by taking away heat from the inner chamber of the pot. The temperature drop destroys bacteria and other pathogens, thereby decreasing the rate of spoilage. |
Items | Non-refrigerated life | Zeer life |
carrots | 4 days | 20 days |
eggplant | 1 day | 21 days |
guava | 2 days | 20 days |
meat | 1 day | 14 days |
okra | 4 days | 17 days |
tomatoes | 2 days | 20 days |
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Works Cited
Plantseed.com. Pot-in-Pot(pdf). Retrieved 7-June-2011.<https://www.planetseed.com/uploadedFiles/Science/Laboratory/Energy/Pot-in-Pot_Refrigerator/pot_refrigerator.pdf>
Ashoka. Mohammed Bah Abba. Retrieved-7-June-2011.<http://www.ashoka.org/mabba>
Oluwasola, Oluwemimo(2011). Pot-in-Pot Enterprise:Fridge for the Poor(pdf). United Nation Development Program. <http://growinginclusivemarkets.org/media/cases/Nigeria_PotInPot_2011.pdf>
External Links:
- How to Make a Pot-In-Pot Cooler. On YouTube, uploaded by GlobeAware.
- Survival-Pot Frig From Nigeria Needing No Electricity. On YouTube, uploaded by annunaki 2006.
- Pot-in-Pot refrigerator. Wikipedia.org