Solar Cookers
Plan on attending the Solar Cookers Convention on Saturday July 19, in William Land Park
(we will be leaving WHS at 9:30 am or meet us there)
Why Solar Cooking is important?
Solar cooking is the simplest, safest, most convenient way to cook food without consuming fuels or heating up the kitchen. Many people choose to solar cook for these reasons. But for hundreds of millions of people around the world who cook over fires fueled by wood or dung, and who walk for miles to collect wood or spend much of their meager incomes on fuel, solar cooking is more than a choice — it is a blessing. For millions of people who lack access to safe drinking water and become sick or die each year from preventable waterborne illnesses, solar water pasteurization is a life-saving skill. The World Health Organization reports that in 23 countries 10% of deaths are due to just two environmental risk factors: unsafe water, including poor sanitation and hygiene; and household air pollution due to solid fuel use for cooking.Solar cooking is the simplest, safest, most convenient way to cook food without consuming fuels or heating up the kitchen. Many people choose to solar cook for these reasons. But for hundreds of millions of people around the world who cook over fires fueled by wood or dung, and who walk for miles to collect wood or spend much of their meager incomes on fuel, solar cooking is more than a choice — it is a blessing. For millions of people who lack access to safe drinking water and become sick or die each year from preventable waterborne illnesses, solar water pasteurization is a life-saving skill. The World Health Organization reports that in 23 countries 10% of deaths are due to just two environmental risk factors: unsafe water, including poor sanitation and hygiene; and household air pollution due to solid fuel use for cooking.
Designs
A box cooker has a transparent glass or plastic top, and it may have additional reflectors to concentrate sunlight into the box. The top can usually be removed to allow dark pots containing food to be placed inside. One or more reflectors of shiny metal or foil-lined material may be positioned to bounce extra light into the interior of the oven chamber. Cooking containers and the inside bottom of the cooker should be dark-colored or black. Inside walls should be reflective to reduce radiative heat loss and bounce the light towards the pots and the dark bottom, which is in contact with the pots. The box should have insulated sides. Thermal insulation for the solar box cooker must be able to withstand temperatures up to 150 °C (300 °F) without melting or out-gassing. Crumpled newspaper, wool, rags, dry grass, sheets of cardboard, etc. can be used to insulate the walls of the cooker. Metal pots and/or bottom trays can be darkened either with flat-black spray paint (one that is non-toxic when warmed), black tempera paint, or soot from a fire. The solar box cooker typically reaches a temperature of 150 °C (300 °F). This is not as hot as a standard oven, but still hot enough to cook food over a somewhat longer period of time.
Types of cookers
Many types of solar cookers exist, including parabolic solar cookers, solar ovens, and panel cookers, among others.
- 1 Principles
- 2 Operation
- 3 Simple designs
- 4. Parabolic reflectrs
- 5. Parabolic troughs
- 6. Spherical reflectors
Design Examples
Advantages and Disadvantages of Cooker Design
Click on image to enlarge!
There is a wide variety of solar cooker designs, many of them very simple to build from inexpensive, easy-to-obtain materials. Some can be built in as little as an hour for less than US$5. Start by choosing a cooker design type based on your requirements. The table below lists strengths and weaknesses of the most common types, and shows some popular cookers of each type. Below each table are all cooker plans of that cooker type. You can also buy a solar cooker from a variety of companies.