1. IB Physics Topic 8 – Solar and Wind 3 Mr. Jean

2. The plan: Video clip of the day Energy production –Solar Power –Wind Power

3. Mitchell & Cameron’s Presentation: Energy Capture Technology

11. Videos: How do Wind Turbines work: https://www.youtube.com/watch?v=x3AfhSH Acqg https://www.youtube.com/watch?v=x3AfhSH Acqg Wind Turbines: https://www.youtube.com/watch?v=p5k2LhK BSgQ https://www.youtube.com/watch?v=p5k2LhK BSgQ What are the guts in a Turbine: https://www.youtube.com/watch?v=LNXTm7 aHvWc https://www.youtube.com/watch?v=LNXTm7 aHvWc

13. 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

14. Energy Loss Speed of air cannot drop to zero after impact with blades. Frictional losses in generator and turbulence around blades.

15. 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

16. 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.

18. 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.