TIDAL ENERGY Mrs. DEEPTI KHATRI SOHAIL KHAN SUBMITTED TO SUBMITTED by HOD(mechanical ) SUBMITTED by SOHAIL KHAN (09EMAME052)

Advantage & Disadvantage overview Introduction What is tidal energy What is tide Generation method Advantage & Disadvantage conclusion Reference

INTRODUCTION The sources for 90% of the electric energy generated today are non-renewable.rThe depletion of the finite resources, environmental pollution, global warming became more apparent near the end of the 20th century.y. There are three types of renewable energy sources: solar, wind, and waterpower. Both solar and wind power are drastically affected by weather variations, while tidal power varies little when the weather changes

What is TIDAL ENERGY Tidal power, also called tidal energy, is a form of hydropower that converts the energy of tides into useful forms of power - mainly electricity. Although not yet widely used, tidal power has potential for future electricity generation. Tides are more predictable than wind energy and solar power

What is tide ? Tides are the rise and fall of sea levels caused by the combined effects of the gravitational forces exerted by the Moon and the Sun and the rotation of the Earth. Tide are two type 1 spring tide 2 neap tide

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

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 This, and changing labour markets following the First World War, resulted in traditional tide mills becoming rare and of historical interest only.

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.

Working of tidal barrage

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.

TIDAL STREAM 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

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

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

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.

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.

Advantage of tidal energy Once you've built it, the energy is free because it comes from the ocean's power There is no carbon dioxide or any other by-products released. It produces no greenhouse gases or other waste. Tides are definitely predictable. There are two tides every day and they can be relied on. So the electricity supply is constant.  A plant is expected to be in production for 75 to 100 years

DISADVANTAGE OF TIDAL ENERGY Expensive to construct. Limited construction site. A barrage is very expensive to build, and affects a very wide area.. Barrage systems require salt resistant parts and lots of maintenance The dams and barrages sometimes interfere with shipping.  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.

conclusion Tidal energy is 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. However, the high demand in technology and capital investment has hindered the development of tidal energy so that the tidal energy projects are much less than those of solar and wind energy.

REFRENCE http://en.wikipedia.org/wiki/Tidal_power http://large.stanford.edu/courses/2010/ph240/chenw1/ file:///C:/Users/Ersohail%20khan/Downloads/tidal%20energy/Tidal%20power.htm www.renewablegreenenergypower.com webecoist.momtastic.com http://www.youtube.com/watch?v=lnHwb8BKJzU