energia_mareelor

8/8/2019 energia_mareelor

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Group members : Perian Bogdan

Ghenea Madalin

Tihu Mircea


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This is the only form ofThis is the only form ofenergy whose source isenergy whose source isthe moon. Some otherthe moon. Some otherenergy sources, nuclearenergy sources, nuclearpower and geothermalpower and geothermal

energy for instance,energy for instance,have the Earth as theirhave the Earth as theirsource. The remainder,source. The remainder,fossil fuels, windfossil fuels, windenergy, biofuels, solarenergy, biofuels, solarenergy, etc. have theenergy, etc. have the

Sun as their source,Sun as their source,directly or indirectly.directly or indirectly.


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The tidal power is generated byThe tidal power is generated bythe gravitational pull of the Moonthe gravitational pull of the Moonon water. Due to theseon water. Due to thesegravitational forces the watergravitational forces the waterlevel follows a periodic high andlevel follows a periodic high andlow. The height of the tidelow. The height of the tide

produced at a given location is theproduced at a given location is theresult of the changing positions ofresult of the changing positions ofthe Moon and Sun relative to thethe Moon and Sun relative to theEarth coupled with the effects ofEarth coupled with the effects ofEarth rotation and the local shapeEarth rotation and the local shapeof the sea floor.of the sea floor.

The tidal energy generator usesThe tidal energy generator usesthis phenomenon to generatethis phenomenon to generateenergy. The higher the height ofenergy. The higher the height ofthe tide the more promising it isthe tide the more promising it isto harness tidal energy.to harness tidal energy.


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Tidal power typesTidal power typesTidal power can be classified intoTidal power can be classified into

two main types:two main types: Tidal stream systems make useTidal stream systems make use

of the kinetic energy from theof the kinetic energy from themoving water currents to powermoving water currents to powerturbines, in a similar way to windturbines, in a similar way to windmills use moving air. This methodmills use moving air. This methodis gaining in popularity becauseis gaining in popularity becauseof the lower cost and lowerof the lower cost and lowerecological impact.ecological impact.

Barrages make use of theBarrages make use of thepotential energy from thepotential energy from thedifference in height betweendifference in height between

high and low tides. Barrageshigh and low tides. Barragessuffer from the problems ofsuffer from the problems ofvery high civil infrastructurevery high civil infrastructurecosts, few viable sites globallycosts, few viable sites globallyand environmental issues.and environmental issues.


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Modern advances in turbine technology may eventually seeModern advances in turbine technology may eventually seelarge amounts of power generated from the ocean especiallylarge amounts of power generated from the ocean especially

tidal currents using the tidal stream designs.tidal currents using the tidal stream designs.


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Tidal stream turbines may be arrayed in high velocityTidal stream turbines may be arrayed in high velocity

areas where natural flows are concentrated such as theareas where natural flows are concentrated such as the

west coast of Canada, the Strait of Gibraltar, thewest coast of Canada, the Strait of Gibraltar, the

Bosporus, and numerous sites in south east Asia andBosporus, and numerous sites in south east Asia and

Australia. Such flows occur almost anywhere whereAustralia. Such flows occur almost anywhere where

there are entrances to bays and rivers, or between landthere are entrances to bays and rivers, or between landmasses where water currents are concentrated.masses where water currents are concentrated.


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AdvantagesAdvantages

Reduced greenhouse gas emissions by tidal powerReduced greenhouse gas emissions by tidal power

Easy to predictEasy to predict

Improved transportation because of the development ofImproved transportation because of the development oftraffic or rail bridges across estuariestraffic or rail bridges across estuaries

Not many places have dramatic enough tide change toNot many places have dramatic enough tide change tosupport a tidal power plantsupport a tidal power plant

Reduces dependence on fossil fuelsReduces dependence on fossil fuels

Is a reliable, dependable sourceIs a reliable, dependable source

RenewableRenewable

Produces no pollutionProduces no pollution


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DisadvantagesDisadvantages

Effect on plants and animals which live near tidalEffect on plants and animals which live near tidalstationsstations

Very little is known about the full effect of tidal powerVery little is known about the full effect of tidal powerplants on the local environment because so few haveplants on the local environment because so few have

been builtbeen built

There are times of low power and high power becauseThere are times of low power and high power becausethe tides have high and low periodsthe tides have high and low periods

Few places where tides are actually strong enough toFew places where tides are actually strong enough to

produce amount able energyproduce amount able energy Could damage/destroy animals habitatsCould damage/destroy animals habitats

Expensive construction of power plantsExpensive construction of power plants

Tidal fences can block paths for migrating fishTidal fences can block paths for migrating fish


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TheThe Rance tidal powerRance tidal powerplantplant is the world's firstis the world's firstelectrical generatingelectrical generating

station powered by tidalstation powered by tidalenergy. It is located on theenergy. It is located on theestuary of the Rance River,estuary of the Rance River,in Bretagne, France. It isin Bretagne, France. It isoperated by lectricit deoperated by lectricit de

France (EDF).France (EDF).

Rance Tidal power plantRance Tidal power plant


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The constructionThe construction

necessitated draining thenecessitated draining the

area where the plant was toarea where the plant was to

be built, which requiredbe built, which required

construction of two dams; anconstruction of two dams; aneffort which took two years.effort which took two years.

Construction of the plantConstruction of the plant

proper commenced 20 Julyproper commenced 20 July

1963, while the Rance was1963, while the Rance was

entirely blocked by the twoentirely blocked by the two

dams.dams.

The construction tookThe construction tookthree years and wasthree years and wascompleted in 1966. Charlescompleted in 1966. Charlesde Gaulle, then President ofde Gaulle, then President ofFrance, inaugurated theFrance, inaugurated theplant on 26 November of theplant on 26 November of thesame year.same year.


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The idea of constructing a tidal power plant on theThe idea of constructing a tidal power plant on the

Rance dates to Gerard Boisnoer in 1921.Rance dates to Gerard Boisnoer in 1921.The site was attractiveThe site was attractive

because there is a largebecause there is a large

average range betweenaverage range betweenlow and high tide levelslow and high tide levels

(8 metres, with a(8 metres, with a

maximum equinoctialmaximum equinoctial

range of 13.5 metres).range of 13.5 metres).

Nevertheless, work didNevertheless, work did

not actuallynot actually

commmence until 1961.commmence until 1961.


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