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14. A small community requires 50 kW of electrical power to function and are determining which energy sources to use. Take air density to be 1.226 kg/m3. a) Determine the local average wind speed needed to produce 50kW from a 30 m diameter horizontal axis wind turbine with Cp = 0.24. Assume no change of wind speed with height. [5 marks] b) Describe the implications of wind power and compare them to alternative methods of *renewable energy [5 marks] The variation of wind speed with height is given by the power law, with exponent, «=0.2, Uref = 8 m/s and Zref = 10 m. = c) Determine the minimum height, the turbine can be mounted to see a change in velocity with height less than 0.2 m/s at any given point across the blades. (10 marks] d) Approximate the power generated by the turbine, by taking velocity at the centre of the turbine as constant across the blades' diameter. [5 marks] Total Question 14 = 25 mark =