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قديم 04-03-2010, 12:15 AM
الصورة الرمزية احمد كامل
احمد كامل احمد كامل غير متواجد حالياً
مراقب عام
 
تاريخ التسجيل: May 2009
الدولة: مصر
المشاركات: 1,411
معدل تقييم المستوى: 22
احمد كامل is a name known to allاحمد كامل is a name known to allاحمد كامل is a name known to allاحمد كامل is a name known to allاحمد كامل is a name known to allاحمد كامل is a name known to all
افتراضي الطاقة الشمسية بالرسوم المتحركة

WHAT IS SOLAR ENERGY?



V. Ryan © 2005


Solar power is energy from the sun and without its presence all life ** earth would end. Solar energy has been looked up** as a serious source of energy for many years because of the vast amounts of energy that are made freely available, if harnessed by modern technology.
A simple example of the power of the sun can be seen by using a magnifying glass to focus the suns rays ** a piece of paper. Before l**g the paper ignites into flames.
This is **e way of using the suns energy, but flames are dangerous and difficult to c**trol. A much safer and practical way of harnessing the suns energy is to use the suns power to heat up water.
A magnifying glass can be used to heat up a small amount of water. A short piece of copper tube is sealed at **e end and filled with water. A magnifying glass is then used to warm up the pipe. Using **** than **e magnifying glass will increase the temperature **** rapidly. After a relatively short time the temperature of the water increases. C**tinuing to heat the water will cause water vapour to appear at the top of the tube. In theory, with enough patience, several magnifying glasses and very str**g sun light enough heat should be generated to boil the water, producing steam. This is **e way of harnessing solar power.



The principle of heating water to boiling point was used by the French in 1888. They developed a solar powered printing press. It used the energy of the sun to boil water, producing steam. The steam was used to drive a steam engine which provided the power to drive the mechanical printing press. The machine was unreliable and very expensive to manufacture.
Modern solar panels are a combinati** of magnifying glasses and fluid filled pipes. The solar panel seen opposite has a glass fr**t which is specially made to focus the power of the sun ** pipes behind it. The pipes carry a special fluid that heats up rapidly. They are painted black to absorb the heat from the sun. The silver reflective surface behind the pipes reflects sun light back, further heating the pipes and the fluid they c**tain. The reflective surface also protects anything behind the solar panel (such as a roof).
The heat produced in the pipes is then used to heat a tank of water. This saves using electricity or gas to heat up the water tank.



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