Clay Pot Refrigerator
This technology is based on the quality porous calcined clay. It consists of a clay pot with lid, which is placed inside a larger one, with a layer sand insulating medium. This sand was adding water at regular intervals (at usually twice daily), the water deposited on the sand, is filtered through the pores of the clay external container, and contact with the environment dry outside is evaporates producing a cooling in the inner container, providing a refrigerated storage space to a cost minimum. We developed a scale prototype and are being made measurements necessary to determine the amount of matter organic to adding the optimum temperature and calcined other aspects.
This conserative clay, keeps food fresh without need for electricity.
Although the physical principle of operation is known for centuries, only in the 1990s Professor Mohammed Bah Abba, rescues this technology is applied massively in Nigeria, Africa.
There is evidence that evaporative cooling was used as early as the Empire Ancient Egypt, around 2500 BC. Fresh In some of the time, slaves are shown fanning water jars, which would increase the flow of air around the pots and porous Evaporation cooling the contents. Many earthenware pots were discovered in the Indus Valley Civilization located in the northwestern region of the subcontinent Indio around 3000 BC, which were probably used for storage and water for cooling.
This technology seems to have been forgotten with the advent of modern Electric refrigerators. However, in the Indian subcontinent, until now, different of clay pots are used to cool the water. In Paraguay, called Kambuchi and Spain, the popular pitchers, all of them, porous clay pots that keeps water cold, which have been in use for centuries (and even now).