34. Renewable Energy A basic analysis of the Savonius wind 1 day ago   48:03

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The Atmosphere, the Ocean and Environmental Change (GG 140)

Renewable energy sources are discussed. These include wind energy, solar energy, biomass energy and geothermal energy. Energy from wind is acquired through the use of large wind turbines. These turbines ideally need to be located in areas where there is strong wind and low atmospheric turbulence. Solar power is collected using both photovoltaic solar cells and concentrated solar power. Energy from biomass can be produced in two ways: burning biomass to generate electricity or fermentation to produce fuel ethanol. Geothermal energy is produced by pumping water below the earth's surface into areas of hot rocks which heats the water and creates steam. This steam is then run through a turbine to produce power.

00:00 - Chapter 1. Renewable Energy Sources
02:20 - Chapter 2. Wind Energy
35:19 - Chapter 3. Solar Power
42:18 - Chapter 4. Biomass Energy
45:14 - Chapter 5. Geothermal Energy
46:45 - Chapter 6. Electricity Sources

Complete course materials are available at the Open Yale Courses website: http://oyc.yale.edu

This course was recorded in Fall 2011.
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A basic analysis of the Savonius wind 34. Renewable Energy 1 day ago   02:37

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Jon
Basic analysis of the Savonius Wind Turbine Shape. I mentioned in the video that at a certain part of the rotation of the turbine that there is practically no collection of the windforce converted to usable power. This however can be overcome by using the "stacked and (angle, 180 degrees rotated) offset" of another Savonius on top of the first one. In a way this is somewhat then like a 4 bladed Savonius that is possible, or a dual Savonius. This will then give 4 pulses per revolution in this configuration. Of course the more you stack, the more weight on the rotation axis support bearings, so then lighter/stronger materials should be considered.

In general, the larger the windblades of the Savonius turbine, the larger both the collected/rotation forces and drag forces. The blades can be larger in the horizontal, vertical or both dimensions. The smaller the turbine blades (from the axis to the tip of the blade), the faster the rotation and the less torque force developed. This loss in torque then can be recovered if the blades are made "taller" in the vertical dimension.

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