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Solar Cookers

Supply, installation and maintenance of solar Cookers


The Fuel Energy Situation in the World

At Express Drainage Solutions, Nairobi, Kenya we are aware that one third of the world’s population are daily dependent on firewood, and for half of those people wood and other biomass is already scarce. Most of them live in just twenty-five fuel-scarce, sun-rich countries, primarily in western Asia and eastern Africa.

We also know that from the studies undertaken in South Africa, poor families are spending up to 26% of their monthly income on fuel. Land around refugee camps in Kenya has been stripped clean of trees and vegetation. The average Kenyan spends about 40% of earned income on fuel, 74% of which is used for cooking. Using solar stoves represents a considerable saving for these families.

The use of Solar stoves

“The use of solar cookers also brings with in important health benefits. Diseases spread through contaminated water cause 80% of the illnesses in the world (WHO). Heating water to the pasteurisation temperature of about 60 0C destroys disease organisms. This temperature is easily achieved with solar cookers. Acute respiratory infections (ARI) are the cause of death for millions of children in the world each year. The large majority of these casualties occur in the developing countries as a result of polluted indoor air due to cooking over open fires in houses without chimneys or ventilation. This problem could be greatly reduced by using solar cookers, which are, of course, completely smokeless” .

What are we capable of doing ?

We can install or supply solar cookers which vary in size from the small size for an average family to huge trailer mounted which is designed for large-scale feeding situations that require cooking great volumes of food quickly. Even though it is called an oven or stove, enormous quantities of food can be boiled, steamed or baked at cooking temperatures of 500° F / 260° C with no fuel costs. We also supply smaller ovens,(image of woman in a village) with cooking temperatures of 360° F / 182° C, which is ideal for cooking the majority of foods in the developing world.

Advantages of Solar cookers include:

  • Potential for unlimited pollution free cooking
  • No fuel needed so no extra weight of bulk for longer trips
  • Clean
  • Airline checkable
  • Cheap to make and free to operate
  • Pasteurize water (65° C or 150° F x 20 minutes) without fuel
  • Will not burn food

Most solar cookers incorporate a few common concepts

  • Reflect/concentrate sunlight from a wide area and focus it on your pot/oven
  • Mirrors
  • Polished metal
  • Foil
  • Mylar
  • Inside surface of potato chip bags
  • Metallic auto sunshade
  • Aluminumized or Mylar bubble wrap
  • Mylar balloons
  • Space blankets

How does a solar oven work?

To cook, you leave this oven in the sun with a pot of food inside, the pot sitting on top of the black bottom of the box. When sunlight enters the box through the glass top, the light waves strike the bottom, making it scorching hot. Dark colors are better at absorbing heat, that is why the inside is black. The molecules that make up the box get excited and generate more heat. The box traps the heat, and the oven gets hotter and hotter. The effect is the same as what goes on in a standard oven: The food cooks.

How does a Parabolic stove work?

A pot of food sits on an arm that holds it in the center of the curved reflectors, suspended slightly above the bottom point of the oven, where all the light is concentrated. This small point gets so hot -- and the molecules vibrate so much -- that the heat waves move upward in a steady stream to strike the bottom of the pot.

Garden Chambers, 2nd Flr. Off Jeevangee Gardens, Mokhtar daddah Street
P.O.BOX 8620-00200, Nairobi
Mobile: +254 727 160738, +254 738 627632.

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