kernenergien | solar sutainable strategy

Solar Energy

The sun is a gigantic fireball driven by nuclear fusion. Thus, large amount of heat are released by the sun. This energy is spreading equally all over the universe and also hits the earth.

irradiation.jpg The sum of the suns radiation (global irradiation) can be divided in direct and diffuse solar irradiance. While the direct irradiance hits the earth directly and is not reflected by any parts of the atmosphere, the diffuse irradiance is reflected by clouds and particulate material. The direct solar irradiance is causing shadows and has an energy potential of up to 2800 kWh/m²/a.

With present techniques the high-quality energy of the sun can be used directly or indirectly. For direct use, photovoltaic cells convert it into electricity. It is also possible to use heat from solar thermal collectors for either urban and industrial usage. Solar thermal power plants concentrate the solar radiation in order to feed turbines with hot steam for electricity production.

For indirect use of the sun’s potential, wind energy, hydropower and biomass can be converted to either electricity or heat. Depending on the amount of solar radiation, thermal processes cause compensating air current, whose energy can be converted into electricity by windmills. Also, the sun causes water to evaporate and to cause rain, which will flow from the mountains to the oceans. In water power plants the kinetic energy of water can be used. Plants need the sun’s radiation for a strong growth via photosynthesis.

The use of the inner heat of our planet is called geothermal power. The origin of this heat is not the sun, but it is also renewable and inexhaustible.