how is a anemometer used

how is a anemometer used ? Wind velocity measurements are usually made with a mug-type anemometers. The anemometers with cups are vertical axis and have 3 cups. The number of minutes of rotation of the cup is electronically recorded. The wind or laser type anemometers are also available. They work with principles based on the behavior of air molecules and speed. Furthermore, the "warm-stranded anemometers" operate based on the principle of cooling the wire with the wind. Its use is not common and practical. Anemographs are devices that record wind speeds in a pictorial.


Anemometer with Mug

The best way to measure wind speed and direction on the projected wind turbine site is to measure the height of the "turbine hub". This method eliminates the uncertainty of calculating wind velocity at different heights. If the anemometer is installed at the top of the pole, it is unaffected by current distortions arising from the pole. If the anemometer has to be installed next to the mast, it must be set to be open to the projected dominant direction. So the shading effect of the tower to the wind should be minimized. The information received from anemometers and direction intuition is also collected from the chip on the IR mini-computer. Devices that collect data in this way are called data collectors. Data collectors can usually be operated for a long time with normal-sized batteries. If the measurement is to be done in cold weather, icing etc., heated anemometers are used. However, the necessity of connecting to the network for their energy needs is not practical aspects.

Wind speed measurements are usually done in the average speed range of 10 minutes to 60 minutes. Thus, with many standard evaluation programs, the configuration is easily provided. The standard measurement height determined by the World Meteorological Organization is 10 meters.

The wind is a giant air. This motion is a specific force along a vector. As a result, wind is measured with two variables, speed and direction. Sudden fluctuations in speed or changes are called moves. In reality, the speed, direction and move of the wind are measured by the best tools. In cases where it is impossible to measure with instruments, the wind is also measured by a nap. The Beaufort scale is used to predict wind measurement.

Meteorologists collect data from weather stations and airports to make air shortcuts. They frequently use wind speed and wind direction information to generally value wind conditions in the wind power Park. Wind speed is strongly influenced by the roughness of the surrounding terrain and the slope of the terrain near the barrier. It is extremely difficult to determine the wind conditions for the "site" unless the meteorological measurements are evaluated by local conditions. In some cases, direct use of meteorological data leads to a nap under the actual wind potential on the site.

Wind ratings

 

The resulting wind records are evaluated for use by quality control and statistical analyses. In assessments, the wind velocity distribution probability density functions are used to achieve both long-term wind registrations and to determine wind characteristics at different heights. These functions are the Rayleigh distribution, the Weibull distribution, and the Beta mountain.

Weibull distribution:

 

The change and distribution of wind in a certain period is very important in both the energy production assessments and the wind industry. Designers of the turbine need information about wind distribution and change in the improvement of the turbine and minimizing costs. If the wind is measured for a year, it is seen that the very heavy winds in general rarely, moderate and violent winds emerge more. The wind distribution for a site is measured either by measuring the "weibull distribution" at varying points and heights based on measurements. This is indicated by the scatter, shape, and scale variables. The total availability of the field below this distribution is "1". In other words, the possibility of the wind in a certain period, including the calm air, is 100%. The Weibull distribution curve is skewed not symmetrical. Each speed frequency that creates this curve also allows for the presence of average velocity.

Rayleigh distribution:

If the Weibull distribution shape variable is 2, such a distribution is called "Rayleigh distribution. Wind turbine manufacturers usually provide machine performance according to the Rayleigh distribution. This is because there are no known wind distributions in different places.

Windrose:

Windrose shows the frequency of the wind in certain cuts. The wind rose also shows how much each segment is a contribution to the average wind speed. A windrose gives the knowledge of proportional wind speeds in different sectors. The wind roses vary from floor to floor. In the vicinity, especially in terms of dominant direction, wind roses show close proximity. In these cases, in practice interpolation or correlation can be done safely. If there is a complex land consisting of mountains and valleys, there are significant direction changes between these places and coastal areas. In these cases, it is often not reliable to make shortcuts. Wind Rose is very important in the settlement of the turbine only in the wind direction. If you need to place the turbines in this direction, the obstacles in the east and West direction are not crucial, for example if the dominant energy direction is north. Because there's no wind power in these directions. In addition, the shape of the wind and its energy content varies by about 10% to year. Therefore a

Note: This page has been translated. Could be a word error. Please consult your specialist




Recommended Article