Tidal Power Energy

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Tidal Power Energy Renewable Energy in Future
Fan Zou
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Tidal Power History

• One of the oldest forms of energy, tide mills in
  use on the Spanish, French and British coasts,
  date back to 787 A.D.
• The first tidal power station began working in
  France in 1965
• More and more commercial-scale tidal barrage was
  put in service

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Why there are tides
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Tides in physics

• Motions of Earth, Moon and Sun
• Renewable resource
• Contains extreme amounts of potential energy
• Requires large tidal difference for generating
  power
• Affects environment less than other fuels and
  gasses
• Might be a solution of current energy problems

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ADVANTAGES  

• Renewable resource, it needs no fuel to maintain,
  and free of charge
• Little pollution, unlike fossil fuels, it
  produces no greenhouse gases or other waste
• It will protect a large stretch of coastline
  against damage from high storm tides
• More efficient than wind
• Predictable source of energy, it is independent
  of weather and climate change and follows the
  predictable relationship of the lunar orbit

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Disadvantages

• Very expensive to build and maintain
• Barrage has environmental affects
• Fish and plant migration
• Silt and mud deposits
• Waste and sewage blocks
• Technology is not fully developed 
• Only provides power for around 10 hours each day,
  when the tide is actually moving in or out

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How it works

• First generation, barrage-style tidal power
  plants
• Works by building Barrage to contain water after
  high tide, then water has to pass through a
  turbine to return to low tide and generating
  electricity
• Sites in France (La Rance), Canada (Annapolis),
  and Russia

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• 
  Bulb Turbine
• 
  Rim Turbine
• 
  Tubular Turbine

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Category of generation

• Ebb generation
• Generation occurs as the tidal ebbs
• Flood generation
• Generation occurs as the tidal floods
• Two-way generation
• Generation occurs both as the tidal ebbs and
  floods

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Two-basin schemes
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Second-generation tidal power plants

• Barrage not need, limiting total costs
• Two types- vertical axis and horizontal axis
• Harness the energy of tidal streams
• More efficient because they allow for energy
  production on both the ebbing and flooding tides
• One site has potential to equal the generating
  power of 3 nuclear power plants

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Second-generation tidal power plants
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Representative tidal projects

• La Rance
• (France)

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Representative tidal projects

• Annapolis
• Royal
  
• 
  (Canada)

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Representative tidal projects

• 
  
• 
  Jiangxia
• 
  (China)

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Conclusion discussion

• Comparing with wind power energy and solar
  energy, tidal power seems not a big sustainable
  resource
• We have to make the cost lower, so that it can be
  built in a large scale
• Turbine has to be more effective, technology of
  its working process should be fully developed
• We should never neglect the environment impacts
  of tidal power, we do need a way to solve the
  current problems.

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• Thank you!!

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