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Energy

Topic: Physics, Society
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WIND POWER

Wind energy generated by (solar) radiation that provides differences in temperature between the different locations. This causes a variation in air pressure which in turn sets air in motion. The turbine turbine mounted on a tower above the ground. From the turbine, a shaft directly into a gearbox which increases the rotational speed so that the generator gets the right speed. It has manufactured a generator that emits the most energy at a certain wind speed. The wind speed is called the rated wind speed.

Wind power has been used for millennia. From the beginning, were recovered wind energy by using sails to propel simple boats to be able to move more easily along the coasts and in rivers. The utilization of wind as an energy source is not new in Sweden either, but has been used since the 1300s. It was then that the first windmills were built to power the flour mills and other types of machines. Today, wind turbines are used mainly for electricity generation.

Approximately 1-3% of the energy from the sun on land converted into wind energy. Most of the wind energy available at high altitude where wind speeds of 160 km / h occur, but it is not possible to use. The energy extracted by the wind turbines will ultimately heat by the mechanical energy delivered to electric motors or the direct conversion of electrical energy to heat in

In November 2006, there were about 750 installed wind turbines in Sweden with a total installed power of around 500 MW, equivalent to about half a nuclear reactor or a larger hydropower plants. Delivered a total of almost 1 TWh of electricity from the Swedish wind power in 2006. Energy from wind power is expected to multiply from both offshore and onshore wind power. In September 2006, the Government decided to plants under 25 MW in the same place does not need to be tested under the Environmental Code.

In May 2008 which pointed Energy Agency out 423 sites in Sweden that would be a good fit for wind turbines. Of the total proposed area are 5817 km2 of land, 1908 km2 of water and 1948 km2 offshore. These areas constitute about 2 percent of Sweden's surface. Areas provides the opportunity for an electricity generation of 20 TWh from wind turbines on land. Sweden's total energy consumption in a year is about 670 TWh. Energy Agency of Sweden allocated SEK 35 billion in 2008 to study of wind power's environmental effects of a project which will run until 2011, which henceforth shall focus on the effects of wind turbines.

The expansion of wind farms in Europe have received a good response from the public. England's government, for example, the target of 10 percent of the energy used in households must come from renewable sources by 2010.

Negative aspects:

Huge rotating propellers on tall poles visible from far and differs from the natural environment. Wind turbines will be needed set up in scenic setting, usually areas that are classified as conservation areas, natural reserves, coastal and island areas or areas with an exceptionally rich bird life where rapidly rotating blades pose a risk of collision with birds. Around potential building sites have suggested that power stations lowers real estate prices, but this is compensated in some way. The power plants generate a particular noise.

Positive aspects:

The wind is free. Wind power is not dependent on imported fuels. The price of electricity derived from wind is not affected by international crisis. Environmentally friendly: no smoke, no emissions, no waste and it goes almost as fast to dismantle a wind turbine to erect a new one.

NUCLEAR POWER

Nuclear power technology is based on so-called fission: splitting the nuclei of the radioactive metal uranium. When grains crosswise formed the heat. It is used in turn to heat the water which forms steam that drives a turbine that generates electricity. Uranium reserves will last for 50 years if we continue to use it as we do now. Current light water reactors do not use fuel particularly efficiently, reducing energy surplus that can not be taken care of. The spent nuclear fuel is radioactive waste. Recently spent fuel is so radioactive that a minute radiation leads to death. A large nuclear power plant produces 3 cubic meters (25-30 tonnes) of waste each year.

Uranium is extracted energy from the nuclear power will be exhausted within a relative short time while the wind will always be utilized. Both nuclear power plants and wind farms destroy the natural image and can cause noise. But nuclear power is not as dependent on the nature of the surroundings so you can build those in places where people do not get disturbed by them. None of energy sources contribute to global warming. Nuclear power is very effective and inexpensive, and whether to invest in wind power will in the beginning to cost a lot and need very many wind turbines to replace a nuclear power plant.

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