From the sun, about 3,850,000 exajoules of energy coming from sun is received by earth. This solar energy is free energy for our planet. A total of 174 petawatts of radiation is absorbed by the planet earth. Clouds, soil and water retain about 70% of radiation while the remaining 30% bounces back to space.
Ever since the ancient times, the heat that comes from the sun has been very useful to people. The solar energy is a free energy for mankind. Through this natural source, we save from using fuel and other means of power source that cost too much.
Compared to natural gas, coal and oik that takes a long time to be harvested in huge amount, this power has no shortage of supply. With this advantage, modern solar applications are being developed to harness the heat. Some of theses solar applications that are used nowadays include water heating, heating and cooling architectures, electricity production and those used for industrial purposes.
Today, many buildings are structured with the use of passive sun heating. They usually have large windows made up of materials that absorb the sun heat. It then stores the collected sun heat to the walls and the floors. These will then slowly give off heat during nighttime when its cold. Through the use of this natural source, building owners are able to save up a large amount of money.
Power plants are also taking advantage of sun power. Before they use fossil fuels but now they use power systems from sun heat. These include the parabolic-through, powered tower and dish.
Parabolic-through focus the power from the sun through slanted curved mirrors. These focuses the light to pipes that contains oil which in turn heats the water used in a generator for electricity production. The dish system and power tower system use mirrors to focus light from the sun in order to produce electricity as well.
Heat coming from the collector may also be used to cool a building. Like an air conditioner, cooling systems use sun heat as a source of power. Evaporative coolers also can make use of the sun for its power source.
Another beneficial use of sun energy is its use for water heating. People put glass panels in roofs to heat water. The water in pipes is pumped from the bottom which in turn causes the heated water to be pumped from the top.
As a free source of power, the cells are utilized by our satellites as it orbits the earth. With these satellites, we are able to use TV, telephones, internet and different navigation system. We are able to enjoy these different applications everyday with the help of solar cell powered satellites.
We have been using solar energy is free energy ever since. We use it to dry clothes. Some even use it to dry food by natural means. However, in the past only a few amount of this vast resource is being used. Nevertheless, with the development of technologies, we are now able to harness this heat for better usage and still it is for free.
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