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solar heaters solar energy is

radiant energy 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 Earth is at its average distance from the sun, called solar constant and its average value is 1.37 × erg/s/cm2 106, or about 2 cal/min/cm2. However, this amount is not constant, since it seems that varies by 0.2% over a period of 30 years. The intensity real power available at Earth's surface is less than the solar constant due to absorciónya dispersion of radiation that causes the interaction of photons with the atmosphere.

intensity solar energy available on a particular point on Earth depends on a complicated but predictable, the day of the year, time and latitude. In addition, the amount of solar energy can be collected depends on the orientation of the receiver.

The power radiation varies time of day, weather conditions that and latitude. One can assume that in good conditions of irradiation the value is approximately 1000 W / m power of radiation varies with time of day, weather conditions and the buffer latitude. One can assume that in good conditions of irradiation the value is approximately 1000 W / m² on Earth's surface. This power is known as irradiance.

Radiation is usable in direct and diffuse components, or the sum of both. The direct radiation reaching the solar focus directly, without intermediate reflections or refractions. Fuzzy is issued by the daytime sky by reflection upon the many phenomena of solar refraction in the atmosphere, clouds and other atmospheric and terrestrial elements. Direct radiation can be reflected and concentrated for use, while it is not possible to concentrate the diffused light coming from all directions.

² at the surface. This power is known as irradiance.

Radiation is usable in direct and diffuse components, or the sum of both. The direct radiation reaching the solar focus directly, without intermediate reflections or refractions. Fuzzy is issued by the daytime sky by reflection upon the many phenomena of solar refraction in the atmosphere, clouds and other atmospheric and terrestrial elements. Direct radiation can be reflected and concentrated for use while it is not possible to concentrate the diffused light coming from all directions.