Country : United Kingdom
Assignment Task :

Lebara 1-` 11:10 if 39%gta O chegg.com A wind turbine chosen for an onshore wind tarm of 70 turbines has the following characteristics 
• Rotor diameter 70 m

• Hub height 1.1 times the rotor diameter . Rated wind speed 12 m/s

• Efficiency at rated wind speed 40%

• Cut-in wind speed 3.4 m/s . Cut-out wind speed 25 m/s . Best efficiency of 50% at a tip speed ratio 7 . Best efficiency achieved in wind speed range from 5 m/s to 8 m/s

• The efficiency changes linearly either side of this range (ie linear interpolation from 0 to 50% between cut-in and 5 m/s, and linear interpolation from 50% and 40% between 8 m/s and rated wind speed.)

The development area consists of open farmland with a surface roughness of 100 mm. A met mast with an anemometer at 10 m above ground has measured a wind resource as given in the attached spreadsheet: W_Restcsv 
Measurements from a second anemometer at 40 m above ground give results typically 22% higher than those at 10 m. 

For the answers, you will need to determine 
1.
The rated power of the turbine

2. The rotation rate of the rotor at 8 m/s

3. The annual mean wind speed at hub height

4. The capacity factor which a single turbine working perfectly could achieve if it were installed in the area Ls, , expected annual energy production (AEP) r the planned wind farm. 
 

 

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  • Posted on : October 31st, 2018
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