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Solar Cooker
Solar Cooker
Solar cooker with a parabolic mirror.

The solar cooker concentrates and bends Solar Radiation with the help of a reflecting surface on the back, top, and bottom sides of a pot. Handling it is easy, but the solar cooker does need its space: the larger the reflector surface, the stronger its power to heat. The simplest form of the solar cooker is the solar oven which is shaped like a box. The pot is placed inside and the open cover points the sun’s rays at the pot. This device is useful in hot countries and it could prevent entire forests in Africa from becoming firewood. Solar cookers are often constructed by children in physics courses because they are easy to build. More costly solar cookers have a round Parabolic Mirror. With a diameter of 140 cm, corresponding to an output of 600 W, they need about 25 minutes to bring 3 litres of water to a boil; with half that diameter, a 150 W output, it would take about 40 minutes to boil just 1 litre of water. Using the parabolic mirror is simple—one must track the sun by hand. More expensive versions have a built-in Tracking device which automatically follows the sun.

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