Solar Energy Radiant energy is produced in the Sun as a result of nuclear fusion reactions. Reaches the Earth through space in quanta of energy called photons, which interact with the atmosphere and land surface. The intensity of solar radiation on the outer edge of the atmosphere, considering that the Earth is at its average distance from the sun, called solar constant and its average value is 1.37 × 106 erg/s/cm2 or about 2 cal/min/cm2Sin however, this amount is not constant, since it seems that varies by 0.2% over a period of 30 years. The intensity of actual power available at Earth's surface is less than the solar constant due to absorption and scattering of radiation that causes the interaction of photons with the atmosphere.
The intensity of solar energy available at a given point on Earth depends on a complicated but predictable, the day of the year the time and latitude. In addition, the amount of solar energy can be collected depends on the orientation of the receiver. A system for harnessing solar energy is the heat widespread. The means to achieve this temperature contribution is made by collectors. The manifold is a surface, exposed to solar radiation, to absorb its heat and transfer it to a fluid. There are three different techniques from each other in the temperature can reach the surface scavenging.
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