under water wind mills
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A SEMINAR ON UNDER WATER WINDMILL
A SEMINAR ONUNDER WATER WINDMILLPresented by:Sandeep.LUSN:4SM09ME043Mechanical Engineering
INTRODUCTIONWhat is it ??? An Underwater windmill like a device that extracts power from the tides. Renewable energy technologies are becoming an increasingly favourable alternative to conventional energy sources to assuage fossil fuel related issues. Tidal energy offers a vast and reliable energy source. This technology is similar to wind energy technology, with the rotor blades driven not by wind power but by tidal currents. The gravitational pull of the moon produces a swift tidal current, which spins the long blades of the turbine . Which in turn produces electricity via different parts of underwater windmill . This Energy derived from the moon that now helps to power a small arctic village.
NAME JUSTIFICATION Why it is called as underwater windmill ?"Basically it's like putting a windmill in the water," said Bjorn Bekken, a project manager for Hammerfest Strom.Or as its looking like a wind mill & are installed on the ocean floor and large river bed , that means these are under the water.
PRINCIPLE OF OPERATIONIn simple a underwater windmill consists of a number of blades mounted on a hub (together known as the rotor), a gearbox, and a generator. The hydrodynamic effect of the flowing water past the blades causes the rotor to rotate, thus turning the generator to which the rotor is connected via a gearbox. The gearbox is used to convert the rotational speed of the rotor shaft to the desired output speed of the generator shaft. The electricity generated is transmitted to land through cables.
RELATED WORKThe first tidal power station was the Rance tidal power plant built over a period of 6 years from 1960 to 1966 at La Rance, France. It has 240 MW installed capacity.254 MW Sihwa Lake Tidal Power Plant in South Korea is the largest tidal power installation in the world. Construction was completed in 2011. The first in-stream tidal current generator in North America (Race Rocks Tidal Power Demonstration Project) was installed at Race Rocks on southern Vancouver Island in September 2006. The next phase in the development of this tidal current generator will be in Nova Scotia (Bay of Fundy).
The company Atlantis Resources is to install a 50MW tidal farm in the Gulf of Kutch on India's west coast, with construction starting early in 2012.The facility could be expanded to deliver more than 200MW.Projections indicate that the cost of the initial 50MW farm - to consist of 501MW turbines - will come in at about $150m.The current timescale has the project's final engineering plans completed by the end of this Year 2013.
The contract for an 812 MW tidal barrage near Ganghwa Island (South Korea) north-west of Incheon has been signed by Daewoo. Completion is planned for 2015.A 1,320 MW barrage built around islands west of Incheon is proposed by the South Korean government, with projected construction start in 2017.In New York City, 30 tidal turbines will be installed by Verdant Power in the East River by 2015 with a capacity of 1.05MW. The contract for an 812 MW tidal barrage near Ganghwa Island (South Korea) north-west of Incheon has been signed by Daewoo. Completion is planned for 2015.A 1,320 MW barrage built around islands west of Incheon is proposed by the South Korean government, with projected construction start in 2017.
ADVANTAGES: The advantages of under water windmill is much more than the disadvantages:-Uses Tidal energy ,which is a clean and renewable source of energyHave lesser impact on the environmentLow running costLong lifetime with little maintenanceReduces the dependence upon fossil fuels
where annual operation and maintenance costs are typically less than 0.5% of initial capital cost of the scheme.12
DISADVANTAGES:The initial cost is too highVery difficult to installThe blade must be coated to avoid corrosionSpecial type material must have to be used for blade
These devices must be designed for ease and speed of installation. Construction of foundations and installation during tidal currents will be challenging, with only a few minutes of slack time between tides.13
It is widely agreed that, tidal stream energy capacity could exceed 120GW globally . The UK has one of the largest marine energy resources in the world.
CONCLUSIONTides play a very important role in the formation of global climate as well as the ecosystems for ocean habitants. At the same time, tides are a substantial potential source of clean renewable energy for future human generations. Depleting oil reserves, the emission of greenhouse gases by burning coal, oil and other fossil fuels, as well as the accumulation of nuclear waste from nuclear reactors will inevitably force people to replace most of our traditional energy sources with renewable energy in the future . Tidal energy is one of the best candidates for this approaching revolution. Development of new, efficient, low-cost and environmentally friendly hydraulic energy converters suited to free-flow waters. This type of machine, moreover ,can be used not only for multi-megawatt tidal power farms but also for mini-power stations with turbines generating a few kilowatts. Such power stations can provide clean energy to small communities or even individual households located near continental shorelines, straits or on remote islands with strong tidal currents.
REFERENCEShttp://www.marineturbines.com/http://www.renewable-solarenergy.com/tidal-energy-power.htmlInternational Energy Agency, World Energy Outlook 2007.Prandle, D., Simple theory for designing tidal power schemes, Advances in Water Resources, 1984.Sheth, S. and M. Shahidehpour, Tidal Energy in Electric Power Systems, in Power Engineering Society General Meeting, 2005.http://www.tidalenergyltd.com/technology.htm
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