tidalenergy-210626034227 .pptx

Tidal power or tidal energy is harnessed by converting energy from tides into useful forms of power, mainly electricity using various methods.

Tides are created by the gravitational effect of the moon and the sun on the earth causing cyclical movement of the seas.

One of the strengths of harnessing power from tidal ranges and tidal streams over other forms of renewable energy is that the process is entirely predictable. �

1. Tidal Energy Guidance by:- Represented by

2. Tidal power or tidal energy is harnessed by converting energy from  tides  into useful forms of power, mainly electricity using various methods. Tides are created by the gravitational effect of the moon and the sun on the earth causing cyclical movement of the seas. One of the strengths of harnessing power from tidal ranges and tidal streams over other forms of renewable energy is that the process is entirely predictable.

3. Energy from the moon Tides generated by the combination of the moon and sun’s gravitational forces Greatest affect in spring when moon and sun combine forces Bays and inlets amplify the height of the tide In order to be practical for energy production, the height difference needs to be at least 5 meters Only 40 sites around the world of this magnitude Overall potential of 3000 gigawatts from movement of tides

4. How it works First generation, barrage-style tidal power plants Works by building Barrage to contain water after high tide, then water has to pass through a turbine to return to low tide Sites in France (La Rance ), Canada (Annapolis), and Russia Future sites possibly on Severn River in England, San Francisco bay, Passamaquoddy

5. Second-generation tidal power plants Barrage not need, limiting total costs Two types- vertical axis and horizontal axis Davis Hydro turbine….. Successfully tested in St. Lawrence Seaway Harness the energy of tidal streams More efficient because they allow for energy production on both the ebbing and surging tides One site has potential to equal the generating power of 3 nuclear power plants

6. According to the estimates of the Indian government, the country has a potential of 8,000 MW of tidal energy. This includes about 7,000 MW in the Gulf of Cambay in Gujarat, 1,200 MW in the Gulf of Kutch and 100 MW in the Gangetic delta in the Sunderbans region of West Bengal.

7. Energy from tide can be generate in three ways TIDE MILL TIDEL BARRAGE TIDEL STREAM

8. Tide mill The generation of energy from the tides is not a new idea. Mills, which used tidal flows in bays and estuaries to drive machinery to grind, were used in medieval times and changing labour markets following the First World War, resulted in traditional tide mills becoming rare and of historical interest only.

9. Tidal Barrage A  tidal barrage  is a dam-like structure used to capture the energy from masses of water moving in and out of a bay or river due to tidal forces a tidal barrage first allows water to flow into a bay or river during high tide, and releasing the water back during low tide. This is done by measuring the tidal flow and controlling the sluice gates at key times of the tidal cycle. Turbines are then placed at these sluices to capture the energy as the water flows in and out.

10. Working of Tidal Barrage

11. The  Rance Tidal Power Station  is the world's first tidal power station and also the world's second biggest tidal power station.  Opened on the 26th November 1966,  With a peak rating of 240 Megawatts, generated by its 24 turbines it supplies 0.012% of the power demand of France.

12. TIDAL STREAM Also known as tidal energy converter (TEC). The technology involved is very similar to wind energy, but there are some differences. Water is 800 times denser than air and has a much slower flow rate this means that the turbine experiences much larger forces and moments. This results in turbines with much smaller diameters

13. TYPE OF TIDAL TURBINE VETICAL AXIS TURBINE HORIZONTAL AXIS TURBINE VENTURI TYPE TURBINE

14. Vertical axis turbine The rotational axis of the system is perpendicular to the direction of water flow. Vertical axis turbines can harness energy from flows in any direction and may be more efficient than horizontal axis turbines in low flow conditions. However, horizontal axis turbines have greater efficiency and survivability in strong flows

15. Horizontal axis turbine A horizontal axis turbine has the traditional form of “fan” type system familiar in the form of windmills and wind energy systems. As water is approximately 800 times denser than air and has a much slower flow rate, water turbines experience much larger force sand moments than wind turbines. This leads to the development of turbines with smaller diameters and blades with different designs.

16. Venturi Tidal Turbine They can operate in slow moving water with a smaller turbine at sites where large turbines are restricted. A shroud of suitable geometry can increase the flow velocity across the turbine by 3 to 4 times the open or free stream velocity.

17. Advantages No pollution Renewable resource More efficient than wind because of the density of water Predictable source of energy vs. wind and solar Second generation has very few disadvantages Does not affect wildlife Does not affect silt deposits Less costly – both in building and maintenance

18. Disadvantages Presently costly Expensive to build and maintain A 1085MW facility could cost as much as 1.2 billion dollars to construct and run Connection to the grid Technology is not fully developed Barrage style only produces energy for about 10 hours out of the day Barrage style has environmental affects Such as fish and plant migration Silt deposits Local tides change- affects still under study

19. Thank You