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Tidal Power

Methods of Extraction. Tidal Power. Patrick Dunlap. Definition and Motivation. What is Tidal Energy? Energy contained in a tide, especially that which can be converted to electricity. Why Tidal Energy? Declining availability of fossil fuels and global climate change. Tidal Theory.

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Tidal Power

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  1. Methods of Extraction Tidal Power Patrick Dunlap

  2. Definition and Motivation • What is Tidal Energy? • Energy contained in a tide, especially that which can be converted to electricity. • Why Tidal Energy? • Declining availability of fossil fuels and global climate change.

  3. Tidal Theory • Energy Source • Tidal Cycle • Amplitude

  4. Traditional Method • Harnesses Potential Energy within tide

  5. Current Plants

  6. Disadvantages • Environmental • Economical • Design

  7. New Method • Involves extraction of kinetic energy from a tide, given in KE Flux • Mechanical processes for extraction are based on the hydrofoil.

  8. Actual Power Output • Energy Flux equation is multiplied by a Constant Cp • The differential dA is now representative of the sweep are of the blades

  9. Site Selection • High average velocity (currently looking at > 3 m/s) • High local energy demand • Within Current Technical Limits

  10. Comparison to Wind • Advantages • Density • Predictability • Aesthetics • Disadvantages • Scale • Construction

  11. Current Projects • In August SeaGen, a 1.2 MW, dual turbine unit will be connected to the power grid • 2.25 MW turbine will supply Portugal • Last December two turbines installed in NY’s East River

  12. References • Tidal Energy, AM Gorlov, 2001 • Choosing and Evaluating sites for Tidal Energy Evaluation, Byrden, Proceeding of the Institute of Mechanical Engineers, V 218 • Tapping the Power of the Seas, Economist, V383 • Tidal Current Energy Extraction: Hydrodynamic Resource Evaluation, Couch, Proceeding of the Institute of Mechanical Engineers, V 220 • www.wikipedia.org

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