The diagram illustrates the process of cooking food using a solar box oven, which relies on sunlight as its main energy source.
Overall, the solar box oven works through a sequence of six steps, beginning with preparing the box and ending with heating the food by converting sunlight into heat energy.
Initially, a cardboard box is painted black to help it absorb heat more efficiently. Then, a pot containing vegetables or other food is placed inside this box. In the next step, the box with the pot is put into a larger box, which has a layer of insulating materials such as newspaper, grass, or sawdust at the bottom to retain heat.
After that, the larger box is covered with foil, and a glass lid is placed on top. This setup allows sunlight to enter but prevents heat from escaping. Finally, the whole structure is placed under direct sunlight, where the black interior absorbs the sunlight and converts it into heat, raising the internal temperature to around 82°C, sufficient to cook the food inside.
In summary, the solar box oven utilizes simple materials and sunlight to produce heat through absorption and insulation, enabling food to be cooked without conventional fuel or electricity.