Ocean Energy
Dr. RAJESWARI R
ASSOCIATE PROFESSOR/EEE,
GOVERNMENT COLLEGE OF TECHNOLOGY,
COIMBATORE – 641013
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Introduction
• The ocean has a tremendous amount energy RENEWABLE ENERGY around the world.
• Ocean energy or ocean power (or marine , hydrokinetic
energy) refers to energy carried by ocean waves, tides ,
salinity and ocean temperature difference.
• The ocean have both Wave power i.e. power from surface
waves & Tidal energy i.e. kinetic energy of large moving
water body.
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GLOBAL POTENTIAL
• Potential to develop 20,000 – 80,000 terawatt-hours
( TWh ) of electricity generated by changes in ocean
temperatures , salt content , movements of tides ,
currents , waves
• Indonesia is a country - three quarter of the area is
ocean - 49 GW recognized potential ocean energy
and has 727 GW theoreticalpotentialoceanenergy.
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Global Potential
Global potential
Form
Annual generation
Tidal energy
>300 TWh
Ocean current power
>800 TWh
Osmotic power (Salinity gradient)
2,000 TWh
Ocean thermal energy (Thermal gradient)
10,000 TWh
Wave energy
8,000–80,000 TWh
Source: IEA-OES, Annual Report 2007[3]
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Different Form of Ocean Energy
1. Tidal energy
2. Ocean Thermal energy
3. Wave Energy
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Tidal Energy
• Tidal energy is the kinetic energy of large moving water
body. It generate maily due to gravitational force of moon.
• More predictable than wind energy and solar power.
• Tidal energy can be utilized by these methods
Tidal stream generators
Tidal barrage
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Tidal Stream Generator
Use kinetic energy of water to driveturbine
The world's first commercial-scale and grid-connected tidal stream generator – SeaGen
– in Strangford Lough.[10]The strong wakeshows the power in thetidal current.
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Tidal Energy
Tidal Barrage
Tidal barrage use potential energy difference between
High Tide &Low tide.
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1
2
Tidal barrage
Single basin barrage
Double basin systems
Ocean Thermal Energy
• Ocean are the largest solar energycollector.
• The OTEC process uses temperature difference
between deep cold water and hot surface water to
generate electricity.
• There are two types of OTEC plant
1.Open cycle
2.Closed cycle
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Closed-loop OTEC
• Closed cycle system use fluid with a low boiling point, such
as ammonia to power a turbine to generate electricity.
Open-loop OTEC cycle
• The Claude Plant used an open cycle in which seawater itself plays
the multiple role of heat source, working fluid, coolant, & heat sink.
WAVE POWER
• Solar energy from the sun creates temperature
differentials that result in wind. The interaction between
windand thesurfaceof watercreateswaves.
Pelamis Wave Energy Converter on site at the European Marine Energy
Centre (EMEC), in 2008
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Types of wave energy technology
1)Oscillating Water Column (OWC)
2)The Pelamis
3)The Wave Dragon
4)The Archimedes Wave Swing (AWS)
5)The McCabe Wave Pump
6)The PowerBuoy
7)The AquaBuOY
Schematic diagram of OWC
The Pelamis
The Wave Dragon
Schematic diagram of the Wave Dragon
The wave Dragon in operating
The Archimedes Wave Swing (AWS)
Schematic diagram of the AWS
The AWS in operating
Schematic diagram of the McCabe Wave Pump
The PowerBuoy
Schematic diagram of the PowerBuoy
The PowerBuoy in operating
The AquaBuOY
Schematic diagram of the AquaBuOY
The AquaBuOY in operating
The positive aspects of using ocean energy are:
•Reduction in the dependence on fossil fuels.
•Source of energy is free, renewable and clean.
•Clean electricity is produced with no production of
greenhouse gas or pollution (liquid or solid).
•Energy produced is free once the initial costs are
recovered.
•These technologies are renewable sources of
energy.
The negative aspects of using ocean energy are:
•At present, electricity produced would cost more than
electricity generated from fossil fuels at their current
costs.
•It leads to the displacement of wild life habitats.
•Technologies are not fully developed.
•Problems exist with the transport of electricity to
onshore loads.
REFERENCES
• http://oceantidalenergy84.weebly.com/advantagesdisadv
antages.html
• https://www.geni.org/globalenergy/research/oceanenergy-technologies/Ocean%20Energy%20Technologies.pdf
• http://oceanenergy.epri.com/
• http://www.conserve-energy-
future.com/Advantages_Disadvantages_WaveEnergy.php
• https://en.wikipedia.org/wiki/Marine_energy
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Thank you
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