The main advantage is that it is a renewable, clean source of electricity. Solar power is also scalable. This means that it can be deployed on an industrial scale, or it can be used to power a single household.
What purpose we use solar energy?
solar energy | Definition, Uses, Advantages, & Facts Solar energy is the radiation from the Sun capable of producing heat, causing chemical reactions, or generating electricity. The total amount of solar energy received on Earth is vastly more than the world’s current and anticipated energy requirements.
If suitably harnessed, solar energy has the potential to satisfy all future energy needs. Solar energy is commonly used for solar water heaters and house heating. The heat from solar ponds enables the production of chemicals, food, textiles, warm greenhouses, swimming pools, and livestock buildings. Cooking and providing a power source for electronic devices can also be achieved by using solar energy.
The most common devices used to collect solar energy and convert it to thermal energy are flat-plate collectors. Another method of thermal energy conversion is found in solar ponds, which are bodies of salt water designed to collect and store solar energy.
- Solar radiation may also be converted directly into electricity by solar cells, or photovoltaic cells, or harnessed to cook food in specially designed solar ovens, which typically concentrate sunlight from over a wide area to a central point.
- Solar energy , from the capable of producing , causing , or generating .
The total amount of solar energy incident on Earth is vastly in excess of the world’s current and anticipated energy requirements. If suitably harnessed, this highly source has the potential to satisfy all future energy needs. In the 21st century solar energy is expected to become increasingly attractive as a source because of its inexhaustible supply and its nonpolluting character, in stark contrast to the finite , , and .
The Sun is an extremely powerful energy source, and is by far the largest source of energy received by , but its intensity at Earth’s surface is actually quite . This is essentially because of the enormous radial spreading of radiation from the distant Sun. A relatively minor additional loss is due to Earth’s and , which absorb or scatter as much as 54 percent of the incoming sunlight.
The that reaches the ground consists of nearly 50 percent visible , 45 percent , and smaller amounts of and other forms of . The potential for solar energy is enormous, since about 200,000 times the world’s total daily electric-generating is received by Earth every day in the form of solar energy.
Unfortunately, though solar energy itself is free, the high cost of its collection, conversion, and storage still limits its exploitation in many places. Solar radiation can be converted either into (heat) or into , though the former is easier to accomplish. Among the most common devices used to capture solar energy and convert it to thermal energy are , which are used for applications.
Because the intensity of at Earth’s surface is so low, these collectors must be large in area. Even in sunny parts of the world’s temperate regions, for instance, a collector must have a surface area of about 40 square metres (430 square feet) to gather enough energy to serve the energy needs of one person.
- The most widely used flat-plate collectors consist of a blackened metal plate, covered with one or two sheets of glass, that is heated by the sunlight falling on it.
- This heat is then transferred to or , called carrier fluids, that flow past the back of the plate.
- The heat may be used directly, or it may be transferred to another medium for storage.
Flat-plate collectors are commonly used for and house heating. The storage of heat for use at night or on cloudy days is commonly accomplished by using insulated tanks to store the water heated during sunny periods. Such a system can supply a home with hot water drawn from the storage tank, or, with the warmed water flowing through tubes in floors and ceilings, it can provide space heating.
- Flat-plate collectors typically heat carrier fluids to temperatures ranging from 66 to 93 °C (150 to 200 °F).
- The of such collectors (i.e., the proportion of the energy received that they convert into usable energy) ranges from 20 to 80 percent, depending on the design of the collector.
- Another method of thermal energy conversion is found in solar ponds, which are bodies of designed to collect and store solar energy.
The heat extracted from such ponds enables the production of chemicals, , textiles, and other industrial products and can also be used to warm , swimming pools, and buildings. Solar ponds are sometimes used to produce electricity through the use of the organic engine, a relatively efficient and economical means of solar energy , which is especially useful in remote locations.
- Solar ponds are fairly expensive to install and maintain and are generally limited to warm rural areas.
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- On a smaller scale, the Sun’s energy can also be harnessed to cook food in specially designed .
- Solar ovens typically concentrate sunlight from over a wide area to a central point, where a black-surfaced vessel converts the sunlight into heat.
The ovens are typically portable and require no other fuel inputs. : solar energy | Definition, Uses, Advantages, & Facts