Soloker, facilities for cooking with solar energy, where the heat of solar radiation is utilized without first having to be converted into electrical energy. Sufficiently high temperatures for cooking are achieved by concentrating the solar radiation and being absorbed by a dark surface, and / or by minimizing heat dissipation from the pan by insulation and covering. Solar cookers are a good way to heat food without firewood, which is important in poorer countries as it saves money and reduces inhalation of the harmful smoke.
Some common design principles
Concentrating solar kettle, where the solar radiation by means of mirrors is concentrated against the bottom of the pan, walls or against a hob. The mirrors can be many and flat, or a single one that is curved or cupped. The surface from which radiation can be collected must be a few square meters in size if no measures have been taken to minimize the radiation from the pan. An advantage of this model is that you can reach very high temperatures. Some models can also be used as "refrigerators", by directing the reflectors towards the black night sky and radiating heat from the food container. A disadvantage is that concentrated beams pose a risk of burns and damage to vision if used carelessly.
A box-type solar cooker - solar oven - needs little monitoring during cooking
Drawer model solar cooker, or solar ovens, where the solar radiation through a transparent window enters a heat-insulated space and where the kettle or dark-colored interior walls and bottom hit, which is heated and in turn heats the air inside. An advantage of this model is that you rarely need to readjust the boiler to follow the sun when it travels, as you do with a mirror or a mirror system. A disadvantage is that cooking in an oven takes longer than cooking over a fire, which is why planning and changing cooking and possibly eating habits will be necessary for the family who will switch from traditional cooking to a solar cooker.
Hybrids of the above. There are several models and variants. Drawer models are often equipped with a simple flat reflector. When using small, portable reflectors, a plastic bag is often swept over the pan to reduce heat loss by convection.
Indirect cooker, where a heat transfer medium, consisting of oil or a salt mixture, is heated in sunshine and stored in a tank, to then give off its heat when boiling during the dark hours of the day. Such cookers are complicated in their construction and thus expensive and have hardly been used for household cooking.
The technical development work currently seems to be concentrated on finding very small and simple constructions, either for industrial production or for self-construction with materials that are available in rural areas even in developing countries.
Quite limited efforts have been made to launch solar cookers, despite the fact that they could be of great importance in rapidly increasing the economic choices of poor people and providing a better quality of life, and in reducing the pressure on the scarce forest resource in many places.  In addition, solar boilers prevent the spread of harmful fumes from wood burning. The smoke from wood burning is as harmful as traffic exhaust fumes and can, among other things, lead to cancer.
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