Solar energy.
Solar energy, radient light and heat from the sun, has been harnessd by humans since ancient times using a range ever- evolving technologies. Solar energy technologies include solar heating, solar photovoltaics, solar thermal electricity, solar architecture and artificial photosynthesisb; which can make considerable contributions to solving some of the most urgent energy problems the world now faces.
What is solar energy ?
Solar Energyergy is the energy received from the sun that sustains life on Earth. For many decades solar energy has been considered as a huge source of energy and also a economical source of energy because it is freely available . However, it is only now after years of research that technology has made it possible to harness solar energy some of the modern solar.
Some of the modern energy systems consists of a magnifying glasses along with pipes filled with fluid. This system consists of frontal glass that focuses the sun's light onto the pipes. The fluid present in the pipes heats up instantly. ln addition they pipes are painted black on the outside so as to absorb maximum amount of heat. The pipes have reflective silver surface on the back that reflects the sunlight back, thus heating the pipes further. These reflective silver surface also helps in protecting everything that is on the back of the solar panel.
The heat thus produced can be used for heating up water in tank, thus saving the large amount of gas or electricity required to heat the water.
Solar energy facts
Solar Energy is already being successfully used in residential and industrial settings for cooking, heating, cooling, lighting, space technology and for communications among other uses. In fact, fossil fuels are also one form of solar energy stored in organic matter. With fossil fuels making major impact on the environment and raising issues of pollution and global warming; solar energy has increased in its importance to industries and homes. While the Reserve of fossils fuels are restricted, there is no limitation to the availability of solar energy. With improvement in solar energy technology and the increase in prices of fossil fuel, solar energy is gradually becoming more and more affordable. In addition , there is additional cost in the form of importation and transportation required for oil , cool and gas.
On a surface on the Earth's Orbit, normal to the sun , solar radiation hits at the rate of 1,366 watt per metre square. This is known as the Solar constant. While 19% of this energy gets absorbed in the atmosphere , 35% gets reflected by clouds. So, the solar energy that reaches sea level is much reduced.
In the last few years, the cost of manufacturing of photovoltaic cells has gone down by as much as 5% in a year and the percentage of government subsidies have gone up. This means that every year, it is becoming more and more affordable to use Solar Energy. In 2004, the Global sources cell production increased by as much as 60%. The amount of energy released by a single kilowatt of solar energy unit is equivalent to burning as much as such a 76 Kg of coal the releases over 135 Kg of carbon di oxide.
Data source : internet
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