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Blue Power

Blue Power. A. B. C. D.

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Blue Power

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  1. Blue Power

  2. A B C D

  3. The wave energy around the British Isles is equivalent to three times current UK electricity demand. Moreover, it is technically possible to convert a sizeable fraction of this wave energy to electricity – the technically and economically recoverable resource has been estimated to be 50-90TWh of electricity per year, or 14-26% of current UK demand. And the UK is not alone. The western seaboard of Europe, facing the Atlantic, offers an enormous number of potential sites off the coast of Ireland, France, Spain, Portugal and Norway. The Pacific coastlines of North and South America, Southern Africa, Australia and New Zealand are also highly energetic. Wave Energy

  4. Wave Energy

  5. Wave energy can also be created out at sea:- • 1. A company called Pelamis Wave Power are developing a method of offshore wave energy collection, using a floating tube called "Pelamis" This long, hinged tube (about the size of 5 railway carriages) bobs up and down in the waves, as the hinges bend they pump hydraulic fluid which drives generators. 2. The action of the waves is also used by the Oyster wave energy device: pumping hydraulic fluid to a shore station to drive a generator. Advantages and disadvantages of wave power

  6. Tidal Energy 1. Tidal Barrage • These work rather like a  hydro-electric scheme, except that the dam is much bigger. • A huge dam (called a "barrage") is built across a river estuary. When the tide goes in and out, the water flows through tunnels in the dam. • The ebb and flow of the tides can be used to turn a turbine, or it can be used to push air through a pipe, which then turns a turbine. Large lock gates, like the ones used on canals, allow ships to pass. The largest tidal power station in the world (and the only one in Europe) is in the Rance Estuary in northern France, near St. Malo. It was built in 1966. Controversial plans have been put forward in the UK to create a barrage across the River Severn near Bristol. http://www.youtube.com/watch?v=oAb_zQ_Sg-M

  7. Offshore Turbines • These are rather like an underwater wind farm. • This has the advantage of being much cheaper to build, and does not have the environmental problems that a tidal barrage would bring. • There are also many more suitable sites. Advantages and Disadvantages of tidal power Summary Videos http://www.youtube.com/watch?v=ZcA3e8_j8XA http://www.youtube.com/watch?v=tSBACzRE3Gw

  8. Wave Energy Advantages • The energy is free - no fuel needed. • Not expensive to operate and maintain.  • No air pollution • No waste produced.  • Can produce a great deal of energy.

  9. Wave Energy Disadvantages • Depends on the waves - sometimes you'll get loads of energy, sometimes almost nothing.  • Needs a suitable site, where waves are consistently strong.  • Some designs are noisy. But then again, so are waves, so any noise is unlikely to be a problem. • Must be able to withstand very rough weather.

  10. Tidal Energy Advantages • The energy is free - no fuel needed. • Not expensive to operate and maintain.  • No air pollution • No waste produced.  • Can produce a great deal of energy. • It produces electricity reliably, as tides are totally predictable. • Offshore turbines and vertical-axis turbines do not have a large environmental impact.

  11. Tidal Energy Disadvantages • A barrage across an estuary is very expensive to build, and affects a very wide area - the environment is changed for many miles upstream and downstream. Many birds rely on the tide uncovering the mud flats so that they can feed. Fish can't migrate, unless "fish ladders" are installed. • Shipping will also be blocked by barrages • Only provides power for around 10 hours each day, when the tide is actually moving in or out. • There are few suitable sites for tidal barrages

  12. Tidal Energy Wave Energy • The tide moves a huge amount of water twice each day, and harnessing it could provide a great deal of energy - around 20% of Britain's needs. • Although the energy supply is reliable and plentiful, converting it into useful electrical power is not easy. • There are eight main sites around Britain where tidal power stations could usefully be built, including the Severn, Dee, Solway and Humber estuaries. Only around 20 sites in the world have been identified as possible tidal power stations. • Ocean waves are caused by the wind as it blows across the sea. • Waves are a powerful source of energy. • The problem is that it's not easy to harness this energy and convert it into electricity in large amounts. • Thus, wave power stations are rare.

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