Question

In: Physics

In the Betz limit the maximum efficency of a wind turbine is Cp=16/27. When the rotation...

In the Betz limit the maximum efficency of a wind turbine is Cp=16/27. When the rotation of the wake is included, the maximum efficiency decreases. Explain why this makes phyiscal sense.

Solutions

Expert Solution


Related Solutions

A 3-blade wind turbine with a diameter of 16 m spins at 35 rpm at a...
A 3-blade wind turbine with a diameter of 16 m spins at 35 rpm at a 5000 m elevation where the average wind speed is 30 km/hr. The atmospheric pressure and temperature at that location are 98 kPa and -10 oC, respectively. There is a rotating wake behind the turbine. Neglecting the frictional drag, calculate the maximum power coefficient and maximum power.
What maximum output would you expect from a wind turbine with a blade of radius 15...
What maximum output would you expect from a wind turbine with a blade of radius 15 ft in a 25 mph wind
An airfoil profile to be used on a wind turbine blade is tested in a wind...
An airfoil profile to be used on a wind turbine blade is tested in a wind tunnel. The prototype (full-scale) airfoil section has a chord length of 2m and moves at 50 m/s relative to the wind, the wind tunnel model has a chord length of 0.4m. The temperature for the model test is the same as for prototype operation. (a) What criterion should be used to obtain dynamic similarity in the experiment? (Write out the criterion in an equation.)...
Describe the potential land impacts of wind turbine installation.
Describe the potential land impacts of wind turbine installation.
how to calculate a shaft diameter of horizontal wind turbine
how to calculate a shaft diameter of horizontal wind turbine
1.The specific rotation, [α]D, for (-)-malic acid is -27. What is the observed rotation for a...
1.The specific rotation, [α]D, for (-)-malic acid is -27. What is the observed rotation for a solution of 0.50 g of (-)-malic acid in 10 mL of water in a sample tube having a pathlength of 10 cm? B) The observed rotation of a solution of 1.3 g of a compound in 10 mL of water is +11 degrees. If the pathlength is 10 cm, what is the specific rotation of the compound? 2. The specific rotation, [α]D, for (-)-2-butanol...
The specific rotation, [α]D, for (-)-malic acidis -27. What is the observed rotation for a solution...
The specific rotation, [α]D, for (-)-malic acidis -27. What is the observed rotation for a solution of 0.75 g of (-)-malic acid in 10 mL of water in a sample tube having a pathlength of 10 cm? The observed rotation of a solution of 1.4 g of a compound in 10 mL of water is -10degrees. If the pathlength is 10 cm, what is the specific rotation of the compound? The specific rotation, [α]D, for (-)-malic acidis -27. What is...
A potential wind turbine location has an average wind speed of 5 m/s at a height...
A potential wind turbine location has an average wind speed of 5 m/s at a height of 10 m. A) Assuming a standard wind friction coefficient of 1/7, what is the average wind power per area at the proposed tower height of 80 m? B) If the proposed turbine has a cut-in speed of 4 m/s and a furling speed of 20 m/s, how many hours per year is the windmill not spinning (assuming Rayleigh statistics)? C) Estimate the yearly...
An employee earned $37,000 during the year working for an employer when the maximum limit for...
An employee earned $37,000 during the year working for an employer when the maximum limit for Social Security was $118,500. The FICA tax rate for Social Security is 6.2% and the FICA tax rate for Medicare is 1.45%. The employee’s annual FICA taxes amount is
4. For the Japanese wind lens turbine, the effect of the shroud is to reduce the...
4. For the Japanese wind lens turbine, the effect of the shroud is to reduce the downstream pressure, e.g., in the rotor wake, say by ?P. Show by modifying the Betz limit, how power production can actually be greater than the Betz limit. Your power production should be a function of a = v4/V. Assume v4 and S4 are known. Get it as close as you can. In the process, recognize that the wind speed at the rotor plane and...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT