Tidal Power

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Tidal Power

• Methods of Extraction

Patrick Dunlap
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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.

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Tidal Theory

• Energy Source
• Tidal Cycle
• Amplitude

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Traditional Method

• Harnesses Potential Energy within tide

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Current Plants
Country Site Installed Power (MW) Basin Area (km2) Mean Tide (m)
France La Rance 240 22 8.55
Russia Kislaya Guba .4 1.1 2.3
Canada Annapolis 18 15 6.4
China Jiangxia 3.9 1.4 5.08
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Disadvantages

• Environmental
• Economical
• Design

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New Method

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

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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

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Site Selection

• High average velocity (currently looking at gt 3
  m/s)
• High local energy demand
• Within Current Technical Limits

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Comparison to Wind

• Advantages
• Density
• Predictability
• Aesthetics
• Disadvantages
• Scale
• Construction

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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 NYs East
  River

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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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