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Such a simple solar cooker can be seen everywhere in Tibet, 15 minutes can burn a pot of water, it is very convenient and energy-saving.

 A solar cooker with 2 square meters light area, it equals to a 2000-watt electric stove in power, it not only has the function of boil the water, but also has other functions such as the cooking, steaming, stewing, cooking etc. it is speculated that a solar cooker a year will help a farmers save 3 tons cattle and sheep manure and 2.5 tons of firewood!

 With a number of solar PV power stations established, Tibet has become the highest and largest rate of solar energy applications provinces.

 Tibet is located in "roof of the world", rich in solar energy resources; it is China's largest number solar radiation, with an average annual solar radiation 6000-8000 MJ / m, the total direct radiation 56% -78%. Natural and economic conditions determine the necessity of using solar energy in Tibet.

 Solar cooker is composed of the shell, frame, and reflective material parts.

 Cookers shell materials and processes

 Sun Cooker’s shell material selection ranging from cement, cast iron, steel, aluminum, glass steel, , gypsum, , wood, paper pulp, straw and so on. Its production process start from manual paste system, release, molding to the mechanical press, there were a large number of pilot production, it is a process of constantly sum up experience and continuous improve the skills. At present, the most widely used are as follows.

Cast iron stove is base on traditional iron production. by using of die-casting methods, the thickness of the shell only about 3mm. The kitchen stove shell has features of high precision, small deformation, convenient transportation, long service life, and has become the factory production.

 Alkali glass fiber reinforced cement GRC kitchen stove body shell uses a certain amount of cement and chemical agents, retarders, the middle of the second floor adds alkali glass fiber mesh, and the middle and four sides uses ribs . This cooker has high strength and good stiffness. Compared to the cement cooker, the weight of the shell is greatly reduced, is able to meet the general requirements of transportation, the disadvantage is poor impact resistance.

 Cement cooker has good plasticity, and the production process is simple, inexpensive and has good water resistance, also has anti-erosion ability, therefore, it is widely used. Its disadvantage is bulky, not suitable for the long-distance transportation. It only suitable for local production and local sales.

 FRP glass fiber reinforced plastic kitchen stove shell body is light in weight, easy to mold and convenient produce, the disadvantage is easy transform, easy to aging. In recent years, a number of improvements have been made in formulation, testing, anti-aging properties to make further enhanced, through improved the supporting structure change the structure.

 Magnesium composite body cooker, this is a magnesium oxide-based glass fiber reinforced composite materials. Because of its thin shell can be done (5-7mm), and high intensity, low prices, good formability, convenient transport, therefore, in recent years, in some areas it is promoted faster.

 The solar reflective material

The most commonly used reflective material is glass and aluminum thin film lenses. Most of the pre-production of solar cooker used glass as reflective materials, now cement cooker is still using this reflective material; its advantage is good wear resistance, easy to clean the surface, cheaper, life-expectancy up to 4-5 years; the drawback is prone to corrosion result in deterioration in reflective layer, in addition it is time-consuming. Vacuum aluminum has high reflectivity, easy to replace; In recent years, commercial production of solar cooker mainly use such reflective material, the life-expectancy is up to 2-3 years.

Solar energy is "green energy". It plays a positive role in Tibet environmental protection.

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