Explain the procedure to obtain the above base speed of a DC motor.

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Chapter 57, Problem 2SQ

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Explain the procedure to obtain the above base speed of a DC motor.

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Problem a. (i) Sketch the ideal power curve of the turbine with the following characteristics: • rated speed is 14 m/s ⚫rated power is 1.25 MW ⚫ cut-in speed is 5 m/s ⚫furling or cut-out speed is 20 m/s (ii) Given part (i), calculate the energy produced in one day if the wind blows continuously between 15 and 20 m/s all day (iii) Can the energy produced in one year be determined if you are told that the average wind speed is 14 m/s? Explain why.

Problem b. Suppose an anemometer mounted at a height of 10 m with a 20-m/s average wind speed (i) Estimate the average wind power at a height of 10 m, assuming Rayleigh statistics and under the following weather conditions • 15°C (ii) Suppose a 1300-kW wind turbine with 60-m rotor diameter is located in those winds with speed computed in the first condition of part (i). Determine the annual energy production with a 30% wind turbine efficiency (iii) Evaluate the wind turbine capacity factor