Question: The following specification for two types of HAWT turbines are supplied by the manufacturers. (i) (ii) Item Rotor diameter Power coefficient Gearbox efficiency Generator

The following specification for two types of HAWT turbines are supplied by the manufacturers. (i) (ii) Item

The following specification for two types of HAWT turbines are supplied by the manufacturers. (i) (ii) Item Rotor diameter Power coefficient Gearbox efficiency Generator efficiency Capital cost Turbine A 25 m 38 90 98 $99,000 Maintenance cost/year $4,000 Turbine B 30 m 35 88 95 $103,000 $4,000 Tabulate the power performance (in kW) of each turbine for the wind speed of 4-10 m/s in step of 2 m/s interval. Density of air is assumed to be 1.23 kg/m. [6 marks] Assume that the annual wind availability at the site is 2000 hours for an average wind speed of 6 m/s. Evaluate which turbine is more economical to be employed. Assume life expectancy for each to be 20 years and the unit cost of power to be 6 cents per kWh to remain constant.

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