TIDAL ENERGY by U03fK3Mu

VIEWS: 31 PAGES: 20

									TIDAL ENERGY
                 INTRO
• Tidal energy is renewable and such
  technology is very important today’s world
  where global warning is becoming more
  and more of an issue.
                  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.
     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.
               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 wasn’t 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
TIDE MILLS
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.
         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.
          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.
            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.
          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 1990’s, Tidal Energy Australia
  proposed a project for Doctor’s Creek near the
  Kimberly town of Derby.
•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.
    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.
               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.
                    BIBLIOGRAPHY
TIDAL ENERGY
http://europa.eu.int/comm/energy_transport/atlas/htmlu/tidalover.html
Ocean Energy
http://www.energy.ca.gov/development/oceanenergy/
TIDAL ENERGY
http://www.uwec.edu/grossmzc/minotc.html
TIDAL ENERGY
http://www.geology.wisc.edu/~pbrown/g410/tidal/tidal.html
TIDAL ENERGY
http://www.eere.energy.gov/RE/ocean_tidal.html
TIDAL ENERGY
http://www.renewingindia.org/tid.html

								
To top