LOW FREQUENCY AND INFRASOUND LEVELS ASSOCIATED WITH WIND TURBINE IN ONTARIO
In a wind turbine blade, the “back” of the blade is the low-pressure or _____ side where pressures are _______. Pressure, Negative Suction, Positive Suction, Negative Pressure, Positive
Among the different type of wind turbine Horizontal Axis Wind Turbine or Vertical Axis Wind Turbine, which one is most powerful? Why?
A very large wind turbine is used to extract power from the wind. The turbine has a diameter of 120 meters. What is the maximum power this turbine can extract from the wind. Assume a wind speed of 10 m/s and the density of air is 1.2 kg/m3. 3.40 MW 6.80 MW 4.02 MW 7.52 MW
How long is a wavelength of infrasound with a frequency of 7 Hz? _____ m What frequency would you need to produce a sound wave in room-temperature air with a wavelength of 17 m? _______ Hz
There is evidence that elephants communicate via infrasound, generating rumbling vocalizations as low as 14 Hz that can travel up to 10 km. The intensity level of these sounds can reach 102 dB, measured a distance of 4.5 m from the source. Determine the intensity level of the infrasound 10 km from the source, assuming the sound energy radiates uniformly in all directions.
There is evidence that elephants communicate via infrasound, generating rumbling vocalizations as low as 14 hz that can travel up to 10 km. The intensity level of these sounds can reach 102 dB, measured a distance of 5.5 m from the source. Determine the intensity level of the infrasound 10 km from the source, assuming the sound energy radiates uniformly in all directions. dB
Wind turbine can be used to support the grid frequency. Let us assume, that generator rotates at 1.360 MW power with a rotating speed 12 rpm. How long turbine can provide 2 MW power be decelerating the wind rotor speed, if the allowed speed deviation is 20 %. Assume constant aerodynamic power P = 1,360 MW during the deceleration. Total inertia of wind turbine is 4820000 kgm2. The given aerodynamic power was 1.360 MW. The requested power to the grid...
Why is the power output by a wind turbine proportional to the cube of the wind velocity, v3?
-1. Consider a wind turbine of diameter 52 m. At a wind speed 16 m/s, the wind turbine reaches is maximum power output of 850 kW. What is the coefficient of performance at this wind speed?
1. A typical wind turbine extracts 40% of the kinetic energy of the wind that blows through the area swept by the blades. For a large turbine 110,000 kg of air moves past the blades at 13 m/s every second. A. Sketch the turbine and the air passing ‘through’ it. B. How much power does the turbine extract? C. If the turbine converts 80% of the power into electric energy, how much electric power is produced?