Tidal Energy

1
Tidal Energy

• By The European School of Brussels

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Why do we want to use Tidal Energy?

• Pollution
• reduction CO2 emmission
• Alternative forms Energy
• Renewable Forms

3
How tides Work

• The moons and suns gravity cause rise and fall
  of water
• Tides Animation
• Most places have 2 high tides and low tides each
  day
• Tides change every 6 hours

4
Ways to extract energy from tides

• Tidal Stream Farms
• Barrages
• Tidal Lagoons

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Tidal Stream Farms

• Turbines similar to wind turbines placed in tidal
  currents
• Good locations would be Gulf Stream and Straits
  of Gibraltar.
• Constant and reliable source of energy

6
Barrages

• sluice gates open allowing the tide to flow
  in.
• Then closed at high tide
• At low tide water released
• Generator activated
• Energy converted into electricity

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Tidal Lagoons

• An area of water cut off from the rest of the sea
• Tide drops water is released through turbines
• Tide rises water is pushed through turbine

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Amount of Energy Generated

• Huge amounts
• E.g. Severn Barrage
• Generates as much electricity as 3 nuclear
  power stations

9
Advantages

• After construction, tidal energy is free
• It produces no greenhouse gases or waste
• It doesnt need fuel
• It is reliable and predictable
• Off-shore turbines dont have a large
  environmental impact

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Disadvantages

• Large structures such as barrages are very
  expensive to build
• Barrages change the environment
• It only provides power 10 hours each day when the
  tide is moving
• There are few suitable locations for barrages

11
Is it really renewable?
Tidal energy is renewable. The tides
will continue to ebb and flow, and the energy
is there for the taking.
12
Sources
http//www.darvill.clara.net/altenerg/tidal.htm ht
tp//www.reuk.co.uk/Severn-Barrage-Tidal-Power.htm
http//www.foe.co.uk/campaigns/climate/tidal_lago
ons.html http//www.aquaret.com/index.php?optionc
om_contentviewarticleid113Itemid256langen