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POT-IN-POT: refrigerator without electricity. In 1995, the Nigerian teacher Mohammed Bah Abba created a cooling system for foods that do not need electricity or ... fuel to operate. stellar This refrigerator is known as Pot-in-Pot (in Spanish: pot pot) and as Zeer, only two pots with sand between the porous material and which has placed a damp cloth. The operating principle of this system is the evaporative cooling. stellar When water evaporates fabric absorbs energy (latent heat) of the inner container, which is kept cool while this process continues. Unfortunately for the design principle, the pot-in-pot stellar only works in dry, moist climate, because water does not evaporate either. Construction 1. Take two large terracotta or clay pots (enamel). A vessel must be lower than the other. Check that the least fit the larger and there is a space between two to three inches. Two. Fill the holes in the base of the vessel. Use clay, large stones, cork, homemade stellar pasta, something suitable available to fill the gap. If you leave the holes open, water will enter the inner tank and drain well in the larger container, which could render the system. Three. Fill the bottom stellar of the larger pot with sand. Fill up to a level which ensures that smaller pot is the same height as the larger pot. April. Place the small container at the bottom layer of sand from the large container. May. Complete all around the small container with sand. Fill almost to the end, only to leave a small hole at the top. June. Pour cold water over the sand. Do this until the sand is completely soaked and can not absorb more water. As you pour, do so gradually to allow time for the water to soak into the clay. July. Take a cloth or towel and soaked in water. Place the fabric over the top of the inner container to cover completely. August. inner vessel is allowed to cool. Use a thermometer or hands to check the influence of the cooling system. 9. Keep the refrigerator "pot-in-pot" in a dry and ventilated area for the water to evaporate out effectively. 10. Vegetables Place or other objects inside for storage. "Should be maintained regularly checking the moisture sand. Pour more water becomes drier to keep well lubricated. Usually, this should be done twice a day. Aside from food, you can also use this system for cooling drinks, or at least keep them fresh, put water in the base, instead of sand. Source Source
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