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Ocean energy

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overview an energy national

Publicado en: Medio ambiente
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Ocean energy

  1. 1. Ocean Energy Kim Cobb with slides from Dr. Alam, MIT
  2. 2. Overview of Ocean Energy -ocean energy is replenished by the sun and through tidal influences of the moon’s and sun’s gravitational forces -near-surface winds induce wave action and cause wind-blown currents at about 3% of the wind speed -tides cause strong currents into and out of coastal basins and rivers -ocean surface heating by some 70% of the incoming sunlight adds to the surface water thermal energy, causing expansion and flow -wind energy is stronger over the ocean due to less drag, although technically, only seabreezes are from ocean energy
  3. 3. How much energy and what types? -250 Billion barrels of oil worth of energy coming into ocean every day -80 million barrels of oil per day produced kinetic potential
  4. 4. -250 Billion barrels of oil worth of energy coming into ocean every day -80 million barrels of oil per day produced How much energy and what types? Theoretical global resource of ocean energy: 8,000-80,000 TWh/yr for wave energy 800 TWh/yr for tidal current energy 2,000 TWh/yr for salinity gradient energy 10,000 TWh/yr for ocean thermal energy World’s electricity consumption 17,000 TWh/yr
  5. 5. Source of Ocean Wave Energy
  6. 6. Wave Energy Extraction Technologies Point Absorber (OPT, Finavera) Oscillating Water Column (Energetech/Oceanlinx) Attenuator, Pelamis WP Overtopping, Wave Dragon
  7. 7. Power From Ocean Waves kW/m crest length
  8. 8. Power From Ocean Waves • Wave energy is strongest on the west coasts and increases toward the poles. • At approx. 30 kW/mcl in the Northwest (yearly avg.), a single meter (3.3 feet) of wave has the raw energy to power about 23 homes.
  9. 9. Point absorber buoys: most common
  10. 10. Ocean Power Technology buoy, to best tested this month off Oregon will power 50 homes. Federal permit obtained for grid-connection. capacity = 150 kW
  11. 11. Oscillating Water Column Installations: LAND NOTE: Plant Bowen (Georgia Power) operates at 3,200,000 kW
  12. 12. Oscillating Water Column Installations: OCEAN
  13. 13. “Overtopping” Wave Energy
  14. 14. “Sea Snake” Wave Energy 121m long, 3.5m tall!
  15. 15. Tidal Energy Conversion
  16. 16. Ocean Renewable Power Company installed first grid-connected tidal device in Cobbscook Bay, Maine in June, 2012. Powers 25 homes.
  17. 17. Ocean Thermal Energy Conversion
  18. 18. 210 kW OTEC test plant, 1993-1998, Hawaii
  19. 19. Future OTEC plant: grow food and fuel?
  20. 20. Ocean Energy: Where are we today? Wave Energy (grid-connected): -0.4MW and 0.5MW OWC off the coast of Pico and Islay by 2008 -2.25MW Pelamis off Portugal by 2008 -0.5MW section of Wave Star Energy off Denmark by 2009 -7MW Wave Dragon off Wales by 2010 Tidal: - barriers: 240MW France in 1966 and 20MW in Canada -Current: 1.2MW off Ireland by 2009, 1MW France Thermal: -0.2MW Hawaii 1993-1998
  21. 21. Ocean Energy: PROS and CONS?

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