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Tidal Energy ppt
- 1. www.oeclib.in Submitted By: Odisha ElectronicControlLlibrary Seminar On Tidal Energy
- 2. Introduction Whatis Tidal Energy History How does it works Application Advantages Disadvantages Uses Environmental Effect Conclusion
- 3. Tides are thewaves caused due to the gravitational pull of the moon and also sun(though its pull is very low). The rise is called high tide and fall is called low tide. This building up and receding of waves happens twice a day and causes enormous movement of water.
- 4. Tidal energyis the utilization of the variations in sea level caused primarily by the gravitational effects of the moon, combined with the rotation of the Earth.
- 5. Tidal powerbuildings were built as early as the 9th Century throughout Europe. This building was built in Ohalo, Portugal circa 1280.
- 6. Tidal Turbines:Tidal turbines use similar technology to wind turbines, although their blades are much shorter and stronger. So a good way to think of them is as underwater windmills. Tidal Barrages: Tidal barrages are very similar to the Dams in hydroelectric plants, except that they are much larger as they are built across an estuary or bay. Tidal Lagoons:Tidal Lagoons are similar to barrages but have a much lower cost and impact on the environment.
- 7. Tidal energyis derived from the motion of the Earth-Moon system. Due to the rotation of earth, the bulges of tides are always ahead of the position on earth right under the moon. The gravitational force between this portion of water and moon generates a torque that decelerates the rotation of earth. On the other hand, this force helps to accelerate the orbital movement of moon around earth. As a consequence, without other interference, the rotational period of earth will finally be equal to the orbital period of moon. The utilization of tidal energy, which will inevitably reduce the tidal currents, takes advantage of the angular dynamic energy of earth in the similar way.
- 8. In-Stream Devices makeuse of the kinetic energy of moving water to power turbines, in a similar way as windmills use moving air. This method is gaining in popularity because it’s removable, it can be scaled up gradually (from one device, to an array, to a larger farm), and has lower potential costs and ecological impact (compared to barrages).
- 9. Barrages makeuse of the potential energy in the difference in height – or head – between high and low tides. They are essentially dams across the full width of a tidal estuary – or the mouth of a river that has a free-flowing connection to the ocean. Barrages have very high costs, a worldwide shortage of viable sites and associated environmental concerns.
- 10. La Rance,Brittany, France The first and largest tidal barrage power plant Constructed between 1961 and 1967. Situated on the Rance River. Contains 24 reversible 10 MW bulb turbines generating a capacity of 240 MW and a net power output of 480 GWh per year. Two- way generation system and pumped storage. Annapolis Tidal Generation Facility on the Bay of Fundy, Canada Constructed between 1981 and 1984. Generating capacity of 20 MW and a net output of 30 GW h per year. Further development is being considered in the Bay of Fundy.
- 11. Tidal Lagoonsare similar to barrages but can be constructed as self-contained structures not extending fully across an estuary. Some suggest this may reduce both costs and overall impacts. They can be configured to generate continuously, which is not the case with barrages.
- 12. 1) It isan inexhaustible source of energy. 2) Tidal energy is environment friendly energy and doesn't produce greenhouse gases. 3) As 71% of Earth’s surface is covered by water, there is scope to generate this energy on large scale. 4) We can predict the rise and fall of tides as they follow cyclic fashion. 5) Efficiency of tidal power is far greater as compared to coal, solar or wind energy. Its efficiency is around 80%. 6) Although cost of construction of tidal power is high but maintenance costs are relatively low.
- 13. 1) Cost ofconstruction of tidal power plant is high. 2) There are very few ideal locations for construction of plant and they too are localized to coastal regions only. 3) Intensity of sea waves is unpredictable and there can be damage to power generation units. 4) Influences aquatic life adversely and can disrupt migration of fish. 5) The actual generation is for a short period of time. The tides only happen twice a day so electricity can be produced only for that time. 6) Frozen sea, low or weak tides, straight shorelines, low tidal rise or fall are some of the obstructions.
- 14. Tidal Electricity- Like other forms of Energy, the main usage of Tidal Energy is in the generation of Electricity. Tidal Energy is being used in France to generate 240 MW of Tidal Electricity at very low costs. Grain Mills – Tidal Energy has been used for hundreds of years. Just like Wind Mills, Tidal Energy was used for the mechanical crushing of grains in Grain Mills. Energy Storage - Tidal Energy can also be used as a store of Energy. Like many of the hydroelectric dams which can be used a large Energy Storage, so Tidal Barrages with their reservoirs can be modified to store energy.
- 15. Energy Storage- Tidal Energy can also be used as a store of Energy. Like many of the hydroelectric dams which can be used a large Energy Storage, so Tidal Barrages with their reservoirs can be modified to store energy. Provide Protection to Coast in High Storms – Tidal Barrages can prevent Damage to the Coast during High Storms and also provide an easy transport method between the 2 arms of a Bay or an Estuary on which it is built.
- 16. Studies todate suggest that local environmental impacts are likely to be minor, but further research is required into device-environment interactions, particularly the impact of tidal stream energy generators on flow momentum. Although the generators create no noise audible to humans, they do create “modest” noise underwater. Manufacturers maintain that this is important to help marine wild-life have an awareness of the presence of the turbine.
- 17. Section 4(e)of the FPA directs the Commission to give equal consideration to the purposes of power and development, energy conservation, fish and wildlife, recreational opportunities, and preservation of environmental quality “in deciding whether to issue a license.” (National Wildlife Federation). Similarly, sections 10(a) and 10(j) are prefaced with the direction that “all licenses issued under this subchapter” shall include the conditions required by sections 10(a) and 10(j).
- 18. Tidal energyis a kind of renewable energy with large potential. It has many advantages over solar and wind energy. For example, the availability of tidal energy is highly predictable and not subject to the impact of weather condition. The energy density of tides is also higher than solar and wind energy.
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