Economic Perspectives of Renewable Energy Systems

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Economic Perspectives of Renewable Energy Systems ( economic-perspectives-renewable-energy-systems )

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9. Ocean Energy Technologies (A) 1. 2. 3. 4. Energy source and ocean energy technologies Ocean energy includes potential and kinetic energy from the ocean. Several types of ocean energy sources with different origins exist and the sources are classed into five principal categories: tidal, wave, marine current, thermal gradient and salinity gradient. There is no commercially leading technology on ocean energy conversion systems at the present time. Nevertheless, there are commercially operated power installation based on tidal and wave power systems. The most developed conversion systems concern tidal energy, which results from the gravitational fields of the moon and the sun. The tides are generated by the rotation of the earth within the gravitational fields of the moon and the sun. The relative motions of these bodies cause the surface of the oceans to be raised and lowered periodically. Tidal energy is predictable in both its timing and magnitude. The locations where tidal power could be developed economically are relatively few, because a mean tidal range of five metres or more is needed for the cost of electricity to be competitive with conventional power plants. Additional requirements are a large reservoir, and a short and shallow dam closure. The energy from ocean waves can be considered to be a concentrated form of solar energy. Winds are generated by the differential heating of the earth, and, as a result of 114

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