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Wind turbines also generate noise. At a distance of 300 metres (980 ft) this may be around 45 dB, which is slightly louder than a refrigerator. At 1.5 km (1 mi) distance they become inaudible. [86] [87] There are anecdotal reports of negative health effects on people who live very close to wind turbines. [88]
The surrounding structure, which is approximately 15% of the wind turbine cost, includes the tower and rotor yaw mechanism. [63] Nacelle of a wind turbine. A 1.5 wind turbine of a type frequently seen in the United States has a tower 80 meters (260 ft) high. The rotor assembly (blades and hub) measures about 80 meters (260 ft) in diameter. [68]
A 200 MW wind farm at 35% capacity factor will generate approximately 613.2 GWh/year. In addition to the megawatt wind farms, community scale single wind turbines of from 250 kW to 750 kW are typically 50 meters high, and residential or farm wind turbines are typically 15–40 m (49–131 ft) high.
Software helps design wind turbines. There are several aero-elastic packages that are used in this design process. FOCUS6 aids in the design of wind turbines and turbine components such as rotor blades. It was developed by Knowledge Centre Wind turbine Materials and Constructions (WMC) [1] and Energy Research Centre of the Netherlands (ECN). [2]
In 1980, the world's first wind farm, consisting of twenty 30 kW wind turbines was installed at Crotched Mountain, in New Hampshire. [16] Wind power resource at 100-meters above surface level. From 1974 to the mid-1980s, the United States government worked with industry to advance the technology and enable large commercial wind turbines.
Turbine blades for small-scale wind turbines are typically 1.5 to 3.5 metres (4 ft 11 in – 11 ft 6 in) in diameter and produce 0.5-10 kW at their optimal wind speed. [1] Most small wind turbines are horizontal-axis wind turbines , [ 2 ] but vertical axis wind turbines (VAWTs) may have benefits in maintenance and placement, although they are ...