Question

Question 30 6 points Save Answer (LO4) A wind turbine with a 40-m-diameter rotor is rotating at 21 rpm under steady winds at an average velocity of 14.7 m/s. The electrical power output from the generator is 350 kW. The efficiency of the gearbox is 93% and generator efficiency is 86%. Take the density of air to be 1.013 kg/m. Answer the following questions; use the white paper to work-out your calculations and then choose the correct answer from the pull-down list below. 1-The wind turbine available wind power input is 2-The wind turbine mechanical power output is 3-The wind turbine% power factor (Cp) is 4- The blade tip speed is kW kW m/s tip speed ratio IS icity produced in 24 hours is Tho kWh 7- The maximum possible povwer factor for wind turbines is

Answer 1

2 SoW N 2 rpm, V s iyi m/s Powes * и оh T 2 a) ind turbine available fowes mput Pwid PAV 2. 3 40)4. -1.013) 2020.78 kW b) tind tbine me chanieal poues ouput p gea qn E o.93 x o.g6 x 2 02o 78 1616- 21 kn /htutbne powe factor Cp 350 7 Pin 2020.78

43.g6 m/s YY трN ) в lade tip speod 6 6 s) Tiр Зрелd atio Blade tip steed wind peed 43. 9 8Чо0 кwh 350 X 24 ) amount elect, in 24 hs С: ох о, S93