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Examoogle • User • info@examoogle.com • EE-2024-8821
Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
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The wind speed is measured using an instrument called
Pyranometer
Manometer
Anemometer
Wind vane
Anemometer
Quick Summary: An anemometer is the primary meteorological instrument used to measure the wind speed or velocity. It is a critical component in wind energy harvesting for site assessment and turbine control, as the power output of a wind turbine is proportional to the cube of the wind velocity.
An anemometer is the primary meteorological instrument used to measure the wind speed or velocity. It is a critical component in wind energy harvesting for site assessment and turbine control, as the power output of a wind turbine is proportional to the cube of the wind velocity.
P=21ρAv3 — The power available in wind, showing cubic dependency on velocity v.
v=k⋅ω — Relation between wind velocity and angular speed of the anemometer shaft.
Most common anemometers, such as the cup anemometer, use three or four hemispherical cups mounted on horizontal arms attached to a vertical shaft. As the wind blows, it creates a pressure difference between the concave and convex sides of the cups, causing the shaft to rotate. The rotational speed (angular velocity ω) is directly proportional to the wind speed (v), which is then recorded electrically or mechanically.
Anemometers are essential for calculating the Capacity Factor of wind farms.
Cup anemometers are the industry standard for meteorological measurements.
Modern anemometers often use ultrasound sensors for higher accuracy and no moving parts.
The wind vane, a common distractor, measures direction, not speed.
Provides real-time data for turbine pitch and yaw control.
Essential for resource assessment before installing wind energy plants.
Mechanical anemometers are subject to wear and tear due to moving parts.
Can be affected by turbulence and obstacles near the measurement site.
Wind Energy Conversion Systems (WECS)
Meteorological weather stations
Aviation safety and airport wind monitoring
Pyranometer: Used to measure solar irradiance (solar power).
Manometer: Used to measure pressure differences in fluids.
Wind Vane: Used specifically to determine wind direction.
C is correct — The anemometer is the specific device used to measure the magnitude of wind velocity.
In wind power problems, always remember that since P∝v3, even a small increase in wind speed results in a significant increase in power generation.