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Title: TIDAL ENERGY INTRO Tidal energy is renewable and such


1
TIDAL ENERGY
2
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3
INTRO
  • Tidal energy is renewable and such technology is
    very important todays world where global warning
    is becoming more and more of an issue.

4
TIDES
  • Tidal action is caused by the gravitational pull
    of the moon and sun upon the Earth as it rotates.
  • The movements of these bodies cause the surface
    of the oceans to be raised and lowered depending
    on their cycles.
  • It is because of these complex cycles that the
    amount of energy retainable from the ocean varies
    with location and time.
  • An advantage of tidal energy is that the amount
    of electricity retainable is very predictable and
    dependable.

5
TIDAL ENERGY
  • The basic concept of tidal energy is to capture
    the potential energy of the raising and lowering
    of the tides.
  • The main advantage of tidal energy is that is it
    is renewable and dependable.

6
HISTORY
  • On a small scale, tidal power has been used
    throughout the history of mankind.
  • In the Middle Ages, tide mills were common along
    the coast of Western Europe.
  • It wasnt until the 20th Century that tidal
    power was considered as an alternative to the
    combustion of fossil fuels.
  • The construction of the French Barrage across the
    Rance estuary

7
TIDE MILLS
8
THE TECHNICAL SIDE
  • Traditionally generating tidal energy involves
    constructing a dam wall across an opening of a
    tidal basin.
  • The dam wall has gates, which open to allow the
    water to come in as the tide rises. This happens
    at great pressure and turns the turbines to
    create electricity.
  • The same process is then repeated when the water
    is let out back into the back into the ocean.
  • This happens every high tide, that is why it is
    important to find a spot where the difference
    between low and high tide is significant.

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11
ADVANTAGES
  • Water is a free resource
  • No Pollution
  • Is produced 24 hours a day all year round.
  • Peak output coincides with peak energy demand.
  • It is 80 efficient, where as coal is only 30
  • It renewable.

12
DISADVANTAGES
  • Tidal energy is not yet economically feasible.
  • There are problems with the transportation of
    electricity once it has been produced.
  • The technology is still being developed
  • Non renewable sources of energy are preferred
    because they have already been set up.

13
ECONOMICS
  • Tidal energy is not cost competitive because it
    is generally not commercially available.
  • When selecting a spot to set up a tidal energy
    station it is important to make sure that it will
    be economically feasible.
  • To set up a tidal facility with an average annual
    output of 1050 MW would cost about 1.2 billion
    dollars, not including maintenance and running
    costs.
  • This is far more expensive than coal and oil.

14
WHAT ABOUT AUSTRALIA?
  • The potential for tidal energy is very high in
    North-Western Australia because the tidal ranges
    are among the highest in the world.
  • The coast line there has several inlets and bays
    that are promising sites.
  • These include the Walcott Inlet, Secure Bay and
    St Georges Basin.
  • In the late 1990s, Tidal Energy Australia
    proposed a project for Doctors Creek near the
    Kimberly town of Derby.

15
  • The advantages of this design was that is
    provided energy around the clock.
  • One basin would hold high water and the other
    would contain a low level of water.
  • A channel cut between the two would hold the
    turbines for power generation.
  • At high tide water would be let into the basin
    and at low tide it would be let out.
  • The plant would have had a capacity to produce
    48MW and would have been the second largest in
    the world and the only one to provide a
    continuous output.
  • There was great community support in Derby but
    after much debate the government decided that
    attaining energy from fossil fuel was the
    preference.
  • There is still the potential for such projects in
    the future.

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ENVIRONMENTAL IMPACTS
  • Tidal energy is renewable, so therefore it
    produces no harmful emissions and does not damage
    the environment in that way.
  • However, there is little known about the effects
    of controlling water levels on aquatic
    ecosystems.
  • Unfortunately, the best way to research this is
    though trial and that is a risk in itself.

18
FUTURE?
  • In a society with increasing energy needs, it is
    becoming more and more important to have
    alternative sources of power to keep up with the
    ever growing energy demand.
  • The capacity of tidal energy exceeds that of coal
    and oil and is renewable.
  • The Department of Energy has shown great
    enthusiasm in regards to tidal power as the
    perfect energy source for the future.

19
BIBLIOGRAPHY
  • TIDAL ENERGY
  • http//europa.eu.int/comm/energy_transport/
    atlas/htmlu/tidalover.html
  • Ocean Energy
  • http//www.energy.ca.gov/development/oceane
    nergy/
  • TIDAL ENERGY
  • http//www.uwec.edu/grossmzc/minotc.html
  • TIDAL ENERGY
  • http//www.geology.wisc.edu/pbrown/g410/tidal/ti
    dal.html
  • TIDAL ENERGY
  • http//www.eere.energy.gov/RE/ocean_tidal.html
  • TIDAL ENERGY
  • http//www.renewingindia.org/tid.html

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THE END
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