Wind power


Also found in: Dictionary, Thesaurus, Wikipedia.
Related to Wind power: Wind energy

wind power

[′win ‚pau̇·ər]
(mechanical engineering)
The extraction of kinetic energy from the wind and conversion of it into a useful type of energy: thermal, mechanical, or electrical.

Wind power

A form of renewable energy generated by wind-spinning turbines.

Wind power

The extraction of kinetic energy from the wind and conversion of it into a useful type of energy: thermal, mechanical, or electrical. Wind power has been used for centuries.

It has been estimated that the total wind power in the atmosphere averages about 3.6 × 1012 kW, which is an annual energy of about 107,000 quads (1 quad = 2.931 × 1011 kWh). Only a fraction of this wind energy can be extracted, estimated to be a maximum of 4000 quads per year. According to what is commonly known as the Betz limit, a maximum of 59% of this power can be extracted by a wind machine. Practical machines actually extract from 5 to 45% of the available power. Because the available wind power varies with the cube of wind speed, it is very important to find areas with high average wind speeds to locate wind machines.

Most research on wind power has been concerned with producing electricity. Wind power is a renewable energy source that has virtually no environmental problems. However, wind power has limitations. Wind machines are expensive and can be located only where there is adequate wind. These high-wind areas may not be easily accessible or near existing high-voltage lines for transmitting the wind-generated energy. Another disadvantage occurs because the demand for electricity varies with time, and electricity production must follow the demand cycle. Since wind power varies randomly, it may not be available when needed. The storage of electrical energy is difficult and expensive, so that wind power must be used in parallel with some other type of generator or with nonelectrical storage. Wind power teamed with hydroelectric generators is attractive because the water can be used for energy storage, and operation with underground compressed-air storage is another option. See Electric power generation, Energy sources, Energy storage

The most common type of wind turbine for producing electricity has a horizontal axis, with two or more aerodynamic blades mounted on the horizontal shaft. With a horizontal-axis machine, the blade tips can travel at several times the wind speed, which results in a high efficiency. The blade shape is designed by using the same aerodynamic theory as for aircraft. See Propeller (aircraft), Turbine

References in periodicals archive ?
The report highlights installed capacity and power generation trends from 2010 to 2030 in the US wind power market.
wind power projects GELEX 1, 2, and 3 will be invested with VND3,660 billion on the total area of 24 ha.
This was in comparison with production in 2017 of 635 GWh, of which Own wind power operations accounted for 348 GWh and Co-owned wind power operations for 287 GWh.
Among other things, a handful of bills would single out wind power for a $1-per-megawatt-hour generation tax, impose unnecessary fees for the production and decommissioning of wind power, take back incentives already awarded to wind power producers, and establish setbacks for airport runways, public schools, hospitals and almost any kind of military site or activity.
India, the third largest emitter of greenhouse gases behind China and the United States, is investing billions in wind power and has set the ambitious goal to double its wind power capacity in the next five years.
He said there were around 28 projects of wind power generation.
Tax incentives have helped make India one of the fastest-growing markets for wind power, a major component of renewable energy.
MAKE's recent research report on the Middle East and Africa Wind Power Outlook, published on 19 June 2017 analyses the wind power market in the MEA, providing updates on policy recommendations, economic trends and the potential advantages and disadvantages for new wind installations in the region.
Offshore wind power mapping has improved using remote sensing data [6].
Since 2001, LM Wind Power has been owned by private equity firm Doughty Hanson of London.
The sources said some six wind power projects of 308.2 MW cumulative capacity have achieved Commercial Operation and were supplying electricity to National Grid.