Wednesday, 3 March 2010

Solar energy

Solar energy:-
a source of inexhaustible energy, but it is up to us are scattered and need to be a modern technology (solar cells) for compilation and use of, a source of clean is not caused by any use of gas or products harmful to the environment as is the case in other fuels.
The definition of solar cells: - Transformers Voltazaviip convert sunlight directly into electricity, a semiconductor and sensitive scan and surrounded by front and rear cover conductor of electricity.

Benefited rights since the foot of the solar radiation energy directly in many applications drying crops and heating homes. Also used in other areas, have been burned Archimedes Rummani Navy in the war in 212 BC by focusing solar radiation on the vessels of the enemy by the hundreds of metal armors. In the Babylonian priests, the women were using verse gold polished mirrors to concentrate solar radiation to get a shot.
Has also been established in the early first century AD the current international terminal for irrigation, solar energy was mediated by working for five hours per day, near Cairo.
Man tried long ago to take advantage of solar energy exploitation, but as far as small and limited but the great development of technical and scientific progress reached by man opened up a new science in the field of solar energy utilization.

Solar energy conversion:-

Can convert solar energy into electrical energy and thermal energy through the photoelectric conversion mechanisms and the thermal conversion of solar energy, has been manufacturing many models of the solar cells can produce electricity in a scientific manner and is characterized by solar cells that it does not include moving parts or pieces, which do not consume fuel or air pollution and life is long and require little maintenance. Achieved the best use of this technology under the console application of solar radiation (solar module) without any optical concentrators, lenses and therefore can be installed on the roofs of buildings to serve in the production of electricity, efficiency is usually estimated at about 20%, while the rest can be utilized to provide heat for heating and water heating.
The applications of solar water heaters are the most prevalent in the area of the thermal conversion of solar energy. Followed by the most important solar dryers that are frequently used in drying some crops such as dates, as well as others can take advantage of the thermal energy to cook food.
The storage of solar energy research of the most important areas of development needed in the application of solar energy and spread of a wide range, where solar energy is available but it is not at hand and not free, real ones, the words on the equipment used to convert electromagnetic energy into electrical energy or heat, as well as storage if necessary.

Applications on the use of solar energy:-

1-Urban planning and architecture: the design of buildings based on the exploitation of solar energy so that it may hand the south for light and warmth.
2-Plant cultivation and horticulture: machinery used in the management of water pumping, crop drying and hatching chickens and drying chicken manure, greenhouses (glass).
3-Solar lighting: The use of natural sunlight from the most commonly used types of lighting throughout the ages.
4-Heat of the sun: The use of techniques that rely on the exploitation of heat from the sun to heat water and space heating and cooling and the process of generating heat.
5-Water treatment: solar distillation is used to make salt water, water, wheat fit for drinking.
6-Solar cooking: The solar cooker is a device that uses sunlight for cooking, drying and pasteurization. The types are divided into three categories: funds that traps heat and stoves, curved concentrators (Barrapolaaks) and stoves in the form of flat panels.
7-Heat treatment: The means to focus solar energy can provide heat treatment for industrial and commercial.
8-Electricity generation: You can convert sunlight directly into electricity using adapters Voltodoiip (PV) and the process of concentration of solar power (CSP) and many other experimental methods.
9-Solar-powered cars.

Methods of storing solar energy:-

Can not get on solar energy during the night. Thus, energy storage is necessary because modern energy systems need to be a source of energy is available all the time, the thermal mass systems can store solar energy in the form of heat at temperatures useful for domestic purposes, either daily or throughout the season, is a variable-phase materials such as paraffin wax and Glauber's salt sources of thermal energy storage as well. These materials are not expensive and ready to use and can reach temperatures useful for domestic purposes (approximately 64 degrees Celsius), can store solar energy is very high temperatures using molten salts.