Solar Systems and Wind Power


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Solar Systems and Wind Power
Solar Systems and Wind Power

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ME 438_538 Hwk 3b Date 27 March Due April 3 Name________________ Instructions complete and email to 3.4 /20 pts 2MW wind Turbine Data: Density = 1.23 kg/m3 Rotor rpm = 18, Rated Steady V = 15 m/s, blade length 32 m, Req. 3.4.a Swept Area _________ m2 3.4 .b At Rated V = 15 m/s, 18rpm Cp = ______ 3.5 b Cp values for Velocity 5 m/s 8 m/s kW output 200kW 1000kW Cp Value (Hint: Use eq L! in Power Point Lecture) 3.5 / 30 pts 3.5a For the 2MW 3 blade wind turbine in Problem 3,4 Complete Table 3B-1 Steady Wind Speed Blade Tip Speed m/s Tip speed ratio λ kW Output Cp Value Table 3B-1 7 m/s 10 m/s 12 m/s 15 m/s 2000 (rated) 3.5b How does the values of Cp (Tip speed ratio λ) compare with Commercial three blades in Fig. 3.1? Answer: Fig 3.1 Graph of Cp (Tip speed ratio λ) ...
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