The wind is carrying the wind is moving air. At present it is one of the most used renewable energies due to its great availability. It competes above all with radiant energy, which is obtained from the sun by means of solar panels and converted into electrical energy.Wind energy is collected in the so-called wind fields , which are large extensions of rural land in which huge wind turbines are installed, whose propellers move with the force of the wind and generate electrical energy, which can be used in homes or industrial plants located in that area.

What is wind energy for?

The wind energy available and that can be harnessed and converted into electrical energy is equivalent to 1 or 2% of the energy that comes from the sun, which translates into a power of 1.74 * 10 14 kW. Of course, the amount will be different depending on the geographical area where the wind is received.

Wind energy is used to:

  • Take advantage of the force of the wind
  • Convert it into electrical energy
  • Replace fossil fuels in electricity generation
  • Displace thermoelectric plants
  • Have a renewable energy source

Wind turbines

Wind turbines are the collectors of wind energy , which receive the force of the wind. They are made up of a high post that is fixed to the ground, and that in the upper part carries a rotor, to which the blades are attached. The blades have an inclination that will oppose the flow of the wind and allow them to turn. The rotor will communicate this energy to convert it into electrical energy.

Since 1980, the manufacture of wind turbines has been started, increasing their height, the diameter of the rotor, which includes the length of the blades. It began with the generation of a power of 50kW and a rotor diameter of 15m. It has been brought to the level of a power of 5000kW and 124m of rotor diameter.

Origin of the wind

The uneven warming of the planet causes the winds. The regions around the equator, at 0 ° latitude, are heated by the sun more directly than other areas on earth. Hot air is lighter than cold air, so it will rise to a height of approximately 10km and spread north and south.

If the planet did not rotate, the air would simply reach the north pole and the south pole, to later descend and return to the equator. Due to the rotation of the earth, the Coriolis force is generated, which is a fictitious or “inertial” force that explains the effect that is described when it becomes obvious that the observer (the earthlings) is rotating. The Coriolis force affects the wind directions on the planet.

The wind rises from the equator and moves north and south in the higher layers of the atmosphere. Around 30 ° latitude in both hemispheres, the Coriolis force prevents the wind from moving further. At that latitude there is an area of ​​high pressure, so the air begins to descend again. When the wind rises from the equator, there will be an area of ​​low pressures near ground level drawing winds from the north and south.

At the poles, there will be high pressures due to the cold air, which is heavier. The dominant wind directions are important for the siting of a wind turbine, since of course you want to locate it in a place where there are as few obstacles as possible to the dominant wind directions. However, local geography can play a role.

Wind power according to the seasons

In temperate zones, summer winds are generally weaker than winter winds. Electricity consumption is higher in winter than in summer in these regions. Therefore, in cold areas of the planet, electric heating is perfect combined with wind energy, since the cooling of houses varies with the speed of the wind, just as the production of electricity in wind turbines varies with the speed of the wind.

The conventional power plants wasted a lot of heat and fuel at the least 60%; In other words, for every unit of useful heat consumed by a house, the power plant has wasted about 1.5 units of heat, and of course, fuel. The annual variations in the wind do not respond to simple patterns and are around 10% in energy production.

 

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Dr. Samantha Robson ( CRN: 0510146-5) is a nutritionist and website content reviewer related to her area of ​​expertise. With a postgraduate degree in Nutrition from The University of Arizona, she is a specialist in Sports Nutrition from Oxford University and is also a member of the International Society of Sports Nutrition.

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