Energia Renovables

Renewable and non rebewable



Renewable Energy

It is called renewable energy to the energy obtained virtually inexhaustible natural sources, either by the vast amount of energythey contain, or because they are able to regenerate by meansnaturales. Among renewables include hydroelectric, wind,solar , geothermal, tidal, biomass and biofuels.

Classification
Renewable sources of energy can be divided into two categories: clean or clean and polluting. Among the first:
The influx of freshwater bodies to bodies of saltwater: blue energy.
Wind: wind power.
The heat of the earth: geothermal energy.
The rivers and freshwater streams: hydropower.
Seas and oceans: tidal energy.
The Sun:solar energy.
Waves: wave energy.

The contaminants are derived from organic matter or biomass, and can be used directly as fuel (wood or other solid vegetable matter), or converted into bioethanol and biogas by fermentation processes in organic or biodiesel by transesterification reactions and urban waste.
Renewable energies pollutants have the same problem as the energy produced by fossilfuels, the combustion emit carbon dioxide, a greenhouse gas, and are often even more polluting because the combustion is not as clean, emitting soot and othersolid particles. Fall within renewable energy as long as they can grow vegetables that produce them, will not run out. Also considered cleaner than their fossil, because theoretically the carbon dioxide emitted during combustion has previouslybeen absorbed to become organic matter through photosynthesis. It is not really equal the amount previously absorbed with that emitted in the combustion, because the processes of planting, harvesting, and processing also consumes energy, with corresponding emissions.
Also, you can catch most of the CO2 to feed microalgae cultures / certain bacteria and yeasts (potential source of fertilizer andanimal feed, salt (in the case of microalgae brackish or salt water) and biodiesel / ethanol respectively, and means for removing hydrocarbons and dioxins in the case of bacteria and yeast (protein oil) and the problem of the particles is solved by the complete combustion and gasification (combustion at very high temperatures in an atmosphere rich in O2 ) in combination with emissions decontaminatingmeans such as filters and precipitators of particles (such as Cottrell precipitator), or activated carbon surfaces.
You can also obtain energy from municipal solid waste and sludge from treatment plants and water purification. Energy is also a pollutant, but also would be largely if not exploited, because the processes of decay of organic matter are made with natural gas emissions and carbondioxide.

Historical Evolution of Renewable Energy

Renewable energies have been an important part of the energy used by humans since ancient times, especially solar, wind and hydro. Sailing, wind mills or water and construction features of buildings to take advantage of the sun, are good examples.

The invention of the steam engine by James Watt, are abandoningthese forms of exploitation, itwas considered unstable over timeand capricious and increasingly using thermal and electric motorsat a time when the still relatively low consumption , did not predict a depletion of sources or other environmental problems that laterarose.

By the 1970 renewable energy is considered an alternative totraditional energy sources, both for its present and future availabilityguaranteed (unlike fossilfuels that require thousands of years to form) and its reduced environmental impact in the case clean energy, and for this reason were called alternative energy. Currentlymany of these energies are not really an alternative, so thealternative name should no longer be used.

Sunflower, an icon of renewable energy for their enormous use ofsunlight, its use for biodiesel and "similar" to the Sun...