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IMAGE: The installation of solar power plants in the areas marked on the map could provide some more than the energy currently consumed in the world (assuming a conversion efficiency of 8%), including from heat, electricity, fossil fuels, and so on. The colors indicate the average solar radiation between 1991 and 1993 (three years, calculated on the basis of 24 hours per day and considering the clouds observed by satellites).

Solar energy is the energy from the sun directly incident solar radiation on Earth can take advantage of its ability to heat or directly through the use of radiation in optical devices or otherwise. It is a type of renewable energy and clean, which is known as green energy.

radiation power varies by time of day, weather conditions that and latitude. One can assume that in good conditions of irradiation the value is higher than 1000 W / m² 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 thanks to the multiple reflection and refraction phenomena in the solar atmosphere, in 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.

direct normal irradiance (or perpendicular to the sun), outside the atmosphere called the solar constant and has an average value of 1354 W / m (corresponding to a maximum value at perihelion of 1395 W / m² and a minimum value at aphelion of 1308 W / m².)

• Passive solar: Take the hot sun without mechanisms or mechanical systems.
• Solar thermal: To produce low-temperature hot water for domestic water and heating.
• Solar photovoltaics: to produce electricity, semiconductor slabs are excited by solar radiation.
• Solar thermal: to produce electricity with a conventional thermodynamic cycle, from fluid heated by the sun.
• Solar Hybrid: combines solar energy with the combustion of biomass or fossil fuels.
• Energy solar wind: Works with air heated by the sun and goes up a chimney where the generators.

Source: wikipedia.org
Picture: wikipedia.org