Green energy resources will give information about resources energetics.
Renewable energy is produced from some source that is naturally replenished. It is primarily used in one of the following three ways:
– production of electricity: renewables are used to produce electricity that is distributed for residential, commercial and industrial use;
– production of thermal energy: renewable resources, for example, water heated by solar energy, can be used directly to heat buildings;
– manufacture of transport fuels: fuels for privately owned motor vehicles, for public transport and industrial and commercial use.
Green energy resources
Water is the most common and oldest renewable energy source. It has been used for centuries for energy production. Hydropower produces minimal CO2 emissions, and with the right water source, it can be a permanent source for electricity generation.
There are different forms of electricity production from hydropower:
– river flow energy: electricity is produced without a dam by rotating turbines generating electricity from appropriately directed river flow;
– by a dam: water from a river or other source is partitioned by a dam, and electricity is produced by turning the water from the dam by turbines;
– small and micro-scale hydropower: The technology traditionally used to produce large scale electricity can also be used on a smaller scale. “Micro hydropower” can often be used to supply electricity to communities that are not close to the grid.
2. Solar energy
Solar radiation, or solar energy, is the largest and purest source of energy. The sun is, directly or indirectly, the source of almost all available energy on Earth.
Ever since ancient times, people have used the heat radiated by the sun to heat homes and other buildings. Solar energy can be used to an extent that meets communal needs, with the help of thousands of solar panels or mirrors that feed the grid, or, to a lesser extent, in the form of smaller roof installations that supply individual homes with electricity and/or hot water.
There are different ways of using solar energy:
– solar energy heating: using solar energy to heat water or using materials with specific characteristics to heat or cool buildings;
– solar electricity: converting solar energy into electricity can be done in two ways: by concentrating solar power: where mirrors are used to concentrate solar energy; photovoltaic collectors: in which light is directly converted into electricity by means of cells or panels.
3. Wind Energy
The wind has tremendous power that is occasionally observed through its pronounced destructive power and in the long term, the wind can shape the terrain or cause erosion in some areas.
Wind power has been used for centuries as a source of energy, whether to propel sailboats or traditional windmills in agriculture. Wind energy is an unstable energy source, as the volume of electricity production changes depending on the wind power that drives the wind turbines at any given time. For electricity generation, the wind is often used in conjunction with other renewable energy sources.
4. Geothermal energy
The Earth’s core is much warmer than Earth’s surface.
The heat from the core is carried through rocks and minerals, heating the underground reserves of water and converting that water into steam that can drive turbines and generate electricity.
In some places, steam generated from warm groundwater naturally reaches the Earth’s surface and creates geysers, allowing this energy to be used in a fairly inexpensive and non-invasive way.
Direct use means the use of hot water that erupts or is pumped from Earth. This hot water is used for heating houses or greenhouses, for certain industrial processes and the like.
Indirectly, this energy is used to generate electricity.
Hot water and water vapor are used to start the generator and have almost no emissions.
The advantage is that these types of power plants can be built in a wide variety of environments, from farms, desert areas to forest recreational areas.
5. Ocean energy
It has been recognized for decades that, at least in theory, the kinetic energy generated by ocean motion can be used to generate electricity.
The use of this renewable energy source is still in the experimental phase, but it has true potential.
There are two basic ways to generate electricity from ocean energy:
– Tidal Energy: tidal wave-based technologies are similar to the use of river flow hydropower but use ocean waters;
– Wave energy: waves contain significant amounts of untapped energy; however, harnessing that energy has been a technical challenge.
The term “bioenergy” refers to the use of organic materials of plant or animal origin.
– Traditional biomass: accounting for about 10 percent of all energy consumed on the planet. Traditionally, energy from biomass is obtained by combustion of wood, plant mass or animal waste to heat households and cook food;
– Biogas: Biogas is produced by fermenting biodegradable materials such as animal or vegetable waste. Gas can be used to heat homes and fuel cookstoves just like natural gas;
– Biofuels: the term “biofuels” refers to the practice of growing crops solely for use in energy production, usually as a transportation fuel.
For example, corn or sugar cane can be used to make bioethanol, while biodiesel can be made from vegetable oils and animal fats. In recent years, however, cultivate crops for biofuel production has caused much controversy, as agricultural land is thus moving away from food production, leading to crop shortages, rising food prices, and worsening global hunger;
– Electricity generated from agricultural waste: unlike biofuels, which are often competing for land use for food production, a range of products generated from otherwise disposed of agricultural waste can be burned to produce electricity.
Green energy resources can never disappear, unlike non-renewable ones (fossil: coal, oil and oil derivatives, natural gas as well as nuclear) that were once created, but for now, they cannot be renewed and it is quite realistic to expect that spend one day.
Renewable energy technology plays a very important role in reducing CO2 emissions into the atmosphere and therefore contributes to reducing the greenhouse effect. It is clean and has a smaller environmental impact than conventional energy technologies.