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Everyone on this planet can benefit from solar energy, some more than others. Renewable energy such as energy from the sun, has been used by humans throughout history to do everyday chores and to maintain daily life. For example, the sun has always provided humans with warmth as well as food. Without the energy from the sun, trees and plants would not be able to photosynthesize, which would be devastating to life on Earth.
Solar energy is produced by the sun, which is a gigantic nuclear fusion reactor running on hydrogen fuel. The sun converts five million tons of matter into energy every second. Solar energy comes to Earth in the form of visible light and infrared radiation. Scientists expect that the sun will continue to provide light and heat energy for the next five billion years.
The amount of solar energy that strikes Earth's surface per year is about 29,000 times greater than all of the energy used in the United States.
Flat panel solar water heating systems are the most popular type of solar collector and consist of an insulated weatherproof enclosure with an absorber plate, flow tubes, and a transparent cover. The transparent cover allows solar energy to pass through and be absorbed by the absorber and flow tubes. The heat generated is then transferred to the fluid circulating through the flow tubes (usually a non-toxic propylene glycol-water antifreeze mixture) and pumped to a storage tank where heat exchangers transfer the heat from the fluid to the household water.
