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The WindMaster Lee Creviston Ben Peters Mark Rizzitiello Lindsey West The Green Team Windmill Overview • Wind enters Windmill and turns blades • Blades drive shaft which is connected generator • Generator shaft turns magnets inside coil of wire which creates electricity • Bare ends of wire are connected to light bulb, which turns on when windmill spins The WindMaster Efficiency Calculations • Power = ½(ρ)(Area)(Velocity3) – ρ: density of air (1.225 kg/m3) – A: rotor swept area exposed to wind (m2) – V: velocity of wind (m/s2) • • • • Power = ½(1.225)(.01597)(1.73) = 0.0481 W Actual voltage generated: ≈3.25 V Actual power generated: ≈0.01 W Efficiency: 0.01/0.0481 = 0.2079 = 20.79% Design Issues • First built generator using cardboard box, which created too much friction on the driveshaft • The first design was too small • We had to change the direction of the magnets versus the direction of the coils to properly generate electricity • We also tried using to K-Nex to build the generator but decided it was not sturdy enough, and ultimately switched to wood Conclusions • A large amount of energy has to be put into the windmill just to create a small amount of electricity • We realized that on this scale the windmill is rather inefficient and would have to be on a very large scale to be useful • Windmills are still a viable solution for generating electricity, however they must be installed in the proper environment and be much more efficient than ours