Solar radiation generally refers to the energy of sunlight. The main use of solar energy in the form of solar thermal conversion, photovoltaic conversion, and photochemical conversion of three main ways. In a broad sense a lot of energy on earth solar energy sources, wind energy, chemical energy, potential energy of water caused by solar or other forms of energy conversion.
Utilizing solar energy are: solar cells, through the photoelectric conversion to the energy contained in sunlight into electricity; solar water heaters, solar heat used to heat water, using hot water and power generation. Now many companies have started using solar energy, for example, Ling took the lead in Qingdao on the use of solar energy Co., Ltd. has developed a solar cooker, solar ovens, solar cookers reflective film, solar water boilers and other products. Clean and environmentally friendly solar energy, no pollution, the use of high-value, solar energy and no energy shortage this statement, all the advantages of its decision to change its energy position in the irreplaceable. It is estimated that annual solar radiation on Earth is 17.8 million kilowatts, which can be developed using 500 to 1000 billion kWh.
However, because the distribution is fragmented, the current energy use is minimal. Geothermal energy resources refer to the depth of 5,000 meters under the ground rock and water within the total calories. One part of the global land within 3 km depth, 150 ℃ high temperature geothermal resources above 140 million tons of coal, at present some countries have started commercial exploitation. World wind energy potential of about 3500 million kilowatts, due to intermittent wind dispersed and difficult to use economic, energy storage technologies for future transmission to any significant improvement will increase the use of wind.
Ocean energy, including tidal energy, wave energy, sea water temperature difference energy, etc., theoretical reserves are substantial. Limited to the technical level, small-scale studies are still in the stage. The current use of the new energy technology is not yet mature, so the total energy the world needs only a small part of the future is very promising.
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