Chavda ravi
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Transcript of Chavda ravi
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GandhinagarGandhinagar Institute Of TechnologyInstitute Of Technology
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` Ocean tides are created from the gravitational pull
of the moon and the rotation of the earth, causing
the tides to ebb and flow twice a day. Only certain
areas in the world are economically viablelocations to harness the power of the tides.
` Thats because the difference between the high
tide and low tide must be more than 16 feet to
harness tidal enough power needed to produceelectricity 2.
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` Tides generated by the combination of the moon
and suns 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
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` If one was built across theSevern Estuary, the tidesat Weston-super-Marewould not go out nearly as
far - there'd be water toplay in for most of the time.
` But the Severn Estuarycarries sewage and otherwastes from many places(e.g. Bristol & Gloucester)out to sea. A tidal barragewould mean that this stuffwould hang aroundWeston-super-Mare anawful lot longer!
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Rising Tide Time
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Ebb Tide TimeEbb Tide Time
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` Once you've built it, tidal power isfree.
` It produces no greenhouse gases orother waste.
` It needs no fuel.
` It roduces electricit reliabl .
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` Not expensive to maintain.
` Tides are totally predictable.
` Offshore turbines and vertical-axis turbines are not
ruinously expensive to build and do not have alarge environmental impact.
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` A barrage across an estuary is very expensive tobuild, and affects a very wide area - the environmentis 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 "fishladders" are installed.
` 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
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` Presently costly Expensive to build and maintain
A 1085MW facility could cost as much as 1.2 billion dollars toconstruct and run
` Connection to the grid
` Technology is not fully developed
` Barrage style only produces energy for about 10 hoursout of the day
` Barrage style has environmental affects Such as fish and plant migration
Silt deposits
Local tides change- affects still under study
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` Tidal Power is renewable
` Doesn't cause pollution, doesn't need fuel
`A tidal barrage is very expensive to build
` Only works when tide is going in or out
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` A tidal barrage affects a large area
` There are very few places that you could sensiblybuild a Tidal barrage
` Underwater turbines may be a better bet than abarrage - they are cheaper and don't have the
huge environmental impact.
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