Sea energy

05 SOURCES OF ENERGY

ENERGY FROM THE SEA

 

  • The energy from the sea can be obtained mainly in three forms:
    • Tidal energy,
    • Wave energy, and
    • Ocean thermal energy.

TIDAL ENERGY

WHAT ARE TIDES?

 

  • The alternate rise and fall of sea levels due to the gravitational forces of the sun and moon along with the rotation of the earth are known as tides.
  • It usually occurs twice on a lunar day at a particular place.
  • High tide is the rise of the sea level and low tide is the fall of sea level.
WHAT IS TIDAL ENERGY?

 

  • The phenomenon of the level of water in the sea rises and falls is called as high and low tides and the difference in sea-levels gives us tidal energy.
  • Tides are a regular phenomenon and can be predicted well in advance over months and years.
  • So, the energy from the massive movement of water can be harnessed and converted into usable form.
  • Tidal energy is harnessed by constructing a dam or tidal barrage across a narrow opening to the sea.
  • A turbine fixed at the opening of the dam converts tidal energy to electricity.
  • During high tide, when the level of water in the sea is high, sea-water flows into the reservoir of the barrage and turns the turbines o produce electricity.
  • During the low tide, when the level of sea-water is low, the sea-water stored in the barrage reservoir is allowed to flow out into sea.
  • This flowing water also turns the turbines and generates electricity.
  • Thus, as sea-water flows in and out of the tidal barrage during high and low tides, it turns the turbines to generate electricity.
ADVANTAGES OF TIDAL ENERGY

 

  • It is an inexhaustible and environment friendly source of energy.
  • It is highly predictable.
  • The energy density is high.
  • It has low operation and maintenance costs.
LIMITATIONS OF TIDAL ENERGY

 

  • There are very few sites around the world which are suitable for building tidal barrages.
  • The rise and fall of sea-water during high and low tides is not enough to generate electricity on a large scale.
  • The construction costs are high
  • It has a negative influence on marine life forms.
  • The sea wave intensity is variable.
WAVE ENERGY

 

  • The waves are generated by strong winds blowing across the sea.
  • Wave energy is obtained by the kinetic energy possessed by huge waves near the seashore to generate electricity.
  • A wide variety of devices have been developed to trap sea wave energy for rotation of turbine and production of electricity.
LIMITATIONS OF WAVE ENERGY

 

  • It has a negative influence on marine life forms.
  • The sea wave intensity is variable.

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