"Proving once again that the best ideas are often the simplest, 21-year-old student/inventor/entrepreneur Emily Cummins has designed a brilliant portable solar-powered refrigerator that works based upon the principle of evaporation. Employing a combination of conduction and convection, the refrigerator requires no electricity and can be made from commonly available materials like cardboard, sand, and recycled metal.
Simply place perishable foods or temperature-sensitive medications in the solar refrigerator's interior metal chamber and seal it. In-between the inner and outer chamber, organic material like sand, wool or soil is then saturated with water. As the sun warms the organic material, water evaporates, reducing the temperature of the inner chamber to a cool, 6 ºC [43 ºF] for days at a time!
Emily made six versions during the initial phase of production and helped make more than 50 during the trip where locals in Namibia nicknamed her "The Fridge Lady". The refrigerator has since rolled out in Zambia, Namibia and South Africa and Emily believes thousands more may be in use as the design passes from community to community through word-of-mouth."
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