ib physics topic 8 – solar and wind 3 mr. jean. the plan: video clip of the day energy production...
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IB Physics
Topic 8 – Solar and Wind 3
Mr. Jean
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The plan:
• Video clip of the day
• Energy production– Solar Power– Wind Power
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Mitchell & Cameron’s Presentation:
• Energy Capture Technology
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Videos:
• How do Wind Turbines work: https://www.youtube.com/watch?v=x3AfhSHAcqg
• Wind Turbines: https://www.youtube.com/watch?v=p5k2LhKBSgQ
• What are the guts in a Turbine: https://www.youtube.com/watch?v=LNXTm7aHvWc
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Formula is an ESTIMATION!
• Not all KE of wind is transformed into mechanical energy
• Wind speed varies over course of year
• Density of air varies with temperature
• Wind not always directed at 90 to blades
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Energy Loss
• Speed of air cannot drop to zero after impact with blades.
• Frictional losses in generator and turbulence around blades.
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Location of Wind Turbines
Turbines must not be placed close to one another.
a) Less KE available for next turbine
b) Turbulence reduces efficiency of next turbine
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• Example Question: A wind turbine has a rotor diameter of 40 m and the speed of the wind is 25 m/s on a day when the air density is 1.3 kg/m3. Calculate the power that could be produced if the turbine is 30% efficient.
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• Example Question: A wind turbine has a rotor diameter of 40 m and the speed of the wind is 25 m/s on a day when the air density is 1.3 kg/m3. Calculate the power that could be produced if the turbine is 30% efficient.
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• Example: A wind generator is being used to power a solar heater pump. If the power of the solar heater pump is 0.50 kW, the average local wind speed is 8.0 m/s and the average density pf air is 1.1 kg/m3, deduce whether it would be possible to power the pump using the wind generator.
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• Example: A wind generator is being used to power a solar heater pump. If the power of the solar heater pump is 0.50 kW, the average local wind speed is 8.0 m/s and the average density pf air is 1.1 kg/m3, deduce whether it would be possible to power the pump using the wind generator.
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