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  116:40 Federal University of Santa MariaPost-Grad. Program in Electrical Eng. –PPGEE Center of Studies in Energy and Power Systems -CEESP  IntroductionIntroduction Sea EnergySea Energy F.A. Farret, PhD  216:40 Ocean Energy (V & H)Ocean Energy (V & H) ãã TheThetidaltidalgravitational forces and gravitational forces and thermal storage of the ocean provide thermal storage of the ocean provide major energy sources;major energy sources; ãã WaveWaveaction adds to the extractable action adds to the extractable surface energy, but is less than tidal surface energy, but is less than tidal energy;energy; ãã Major Major ocean currentsocean currents(like the Gulf (like the Gulf Stream) may be exploited to extract Stream) may be exploited to extract energy with underwater rotors similar energy with underwater rotors similar to wind turbines;to wind turbines; ãã Offshore windsOffshore windsare unhindered and are unhindered and strong;strong; ãã Sea temperatureSea temperaturegradients.gradients.  316:40 Ocean Energy (V): Tidal EnergyOcean Energy (V): Tidal Energy ãã TidesTidesare produced by gravitational forces of the moon and are produced by gravitational forces of the moon and sun and the Earthsun and the Earth’’s rotation s rotation (24 hour, 50 minute period);(24 hour, 50 minute period); ãã Existing and Existing and possible sitespossible sites::  – – France: France: RanceRanceRiver estuary 240 MW stationRiver estuary 240 MW station  – – England: Severn River England: Severn River   – – Canada: Canada: PassamaquoddyPassamaquoddyin the Bay of in the Bay of FundyFundy(1935 attempt (1935 attempt failed; not economically practical)failed; not economically practical)  – – California: high potential along the northern coast;California: high potential along the northern coast; ãã Environmental, economic, and esthetic Environmental, economic, and esthetic aspectsaspectshave have delayed its implementationdelayed its implementation  416:40 Ref.: www.fujita.com/archive-frr/ TidalPower.htmlSource: Wave Energy paper. IMechE, 1991 and Euroean Director of Renewable Ener Suliers and Services 199Figures in kW/m ãã Salter Salter ““ducksducks””rock up and down as the wave passes beneath it. rock up and down as the wave passes beneath it. This oscillating mechanical energy is converted to electrical enThis oscillating mechanical energy is converted to electrical energy;ergy; ãã  A  A WavegenWavegen, wave, wave--driven, air compressor or oscillating water driven, air compressor or oscillating water column (OWC) spins a Wells turbine to produce electricity column (OWC) spins a Wells turbine to produce electricity regardless of flow direction.regardless of flow direction. Ocean Energy (H): Wave EnergyOcean Energy (H): Wave Energy

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