A solar fridge for rural application

A young British inventor has designed an energy-efficient fridge that can easily be built from household materials.
/~The "sustainable" fridge of design student Emily Cummins, 21, works through evaporation. It  can be used to keep perishable goods such as milk and meat cool for days. Without using any power, temperatures stay at around 6°C.
The fridge comprises two cylinders, one inside the other. The outer cylinder can be made up of any solid material such as wood or plastic, and has holes drilled into the sides.
The inner cylinder is made of metal, with no holes, to keep the contents dry. The gap between inner and outer cylinder is filled with a material such as wood, sand or wool that can be soaked with water.
The sun’s rays heat the filling and the water evaporates, cooling the contents of the inner chamber.  
Cummins spent five months in Africa perfecting and demonstrating her product. She is now working on a second-generation refrigerator; which will be even more energy efficient and cool to constant temperatures lower than 6°C.
She has also designed a simple, yet effective water carrier that allows one person to transport up to five containers simultaneously. The carrier can also be altered to loads such as firewood.
It consists of a ladder-type wooden frame fitted with a "wheel", a ball shape consisting of different diameter tree branches, so it can be pulled over the rough African terrain.
Cummins: emily@emilycummins.co.uk; www.emilycummins.co.uk