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Tidal Power

Tidal Power is the energy of the moving water of the tides, which can be harnessed to generate electricity. This is a green, renewable energy of the future.

500 Questions

Why are the turbines in tidal power stations reversible?

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Asked by Wiki User

The turbines in tidal power stations are reversible to optimize energy efficiency. This means they can generate power both when the tide is coming in (flood tide) and when it is going out (ebb tide). By enabling the turbines to rotate in both directions, tidal power stations can capture energy from the tidal flow in both directions, maximizing their overall electricity generation potential.

How do turbines work?

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Asked by Wiki User

A simple turbine.

Air is drawn into the engine continuously and compressed by a series of rotating blades. Fuel is sprayed into the combustion chamber and burnt increasing the gas temperature to around 1200C.

The hot high pressure gas expands through a second set of blades mounted on the same shaft as the compressor blades. The energy of the gas is partially expended powering the compressor, but has a residual energy which is either expended as a hot jet (resulting in thrust) or which drives a further independent set of blades to power a propeller or other device.

see http://www.rolls-royce.com/education/schools/how_things_work/journey02/index.html

Good things about tidal?

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Asked by Wiki User

The Good thing about tidal energy is that is a very clean for of energy. Tidal energy is also renewable. Tidal energy plants could be place along the coast.

How high does bay of fundy's tide reach?

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Located on the northeast coast of North America, the Bay of Fundy is 400 to 700 feet deep. The bay is 180 miles long and measures 62 miles wide at the mouth.

What is a semi diurnal tide and how is it caused?

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Asked by Wiki User

answ2. The tides are caused by the attraction of gravity.

On the side of the Earth nearest the Moon, the attraction of the Moon lessens the strength of the local perceived gravity field.

On the side of the earth farthest from the Moon, the ocean there sees the gravitational pull of the whole Earth-Moon system, but the effective centre of this system is further away than the real centre of the earth. Thus the gravity field is seen as slightly less and there will be high tides there as well.

When the Sun and the Moon are in alignment with the Earth, (New Moon), we have the strongest gravitational force and the tides are at their maximum height.

When the Sun is on the opposite side of the Earth from the Moon, (Full Moon) then we have a weaker gravitational force, and the high tides are not quite as high as for the New Moon case.

Why can't tidal energy be used everywhere?

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Asked by Wiki User

The limitation of tidal energy is that it works only twice a day. This is because it is caused by the gravitational pull of the of the moon and sun.

Another limitation is that, for it to be economical, it needs a large bay or river mouth with a narrow opening to the sea, so that the speed of the water can be harnessed. Suitable areas are not common round the world.

Does tidal energy cause pollution?

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Asked by Wiki User

Do they CAUSE pollution? Not really. However, by obstructing the normal tidal flows of sea water, they allow pollutants to accumulate in the tidal basin, preventing the pollutants from flowing back out to sea.

List of tidal power stations in India?

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Asked by Wiki User

Hydro Electric Power Stations

1.Mettur Dam

2.Papanasam

3.Lower Bhavani

4.Cauvery

5.Vaigai

6.jeyamkondam Perambalur District-Commission Appointed

Mini Hydro Power Plants

1.Aliya

2.Lower Bhavani

3.Pechiparai

4.Sathanur

Can tidal energy be stored?

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Asked by Wiki User

Yes it can be stored but if you have massive ammounts going into the object that's holding the energy then it can only hold for a short ammount of time

Increasing tidal volume?

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Is tidal power noisy?

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What are the disadvantages of renewable tidal power as an energy source?

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Asked by Wiki User

  • Tidal power plants can only be put where there is sufficient tidal flow. This limits the number of them and the places they can power.
  • Tidal power is often very expensive.
  • The turbines used can kill appreciable numbers of fish. They can also prevent the movement of fish up and down rivers that might be essential spawning grounds.
  • They can often cause difficulties for the movement of shipping.
  • There are environmental changes that happen when tidal lagoons or barrages are built. One is the change in salinity of the water in inlets. Another change is increased turbidity (how unclear the water is) and sediment.
  • Compared to other energy sources, this is not too bad, but it seems to be only a small part of the answer to our energy needs.

A:

  • Holding back the tide allows silt to build up on the river bed.
  • The dams and barrages sometimes interfere with shipping.
  • You will need to find a way to connect the electricity to the grid.
  • Pose same threats as large dams, altering the flow of saltwater in and out of estuaries, which changes the hydrology and salinity and possibly negatively affects the marine mammals that use the estuaries as their habitat
  • Turbidity decreases as a result of smaller volume of water being exchanged between the basin and the sea.
  • The average salinity inside the basin decreases, also affecting the ecosystem
  • A barrage across an estuary is very expensive to build, and affects a very wide area - the environment is changed for many miles upstream and downstream. Many birds rely on the tide uncovering the mud flats so that they can feed.
  • There are few suitable sites for tidal barrages.
  • Only provides power for around 10 hours each day, when the tide is actually moving in or out.
  • It only provides about 7% of the power needed for England and Wales that means that some people get their energy close to free and some pay a lot of money
  • Water is not replenished, it cannot flow away so any dirt or pollution lingers around the coast much longer
  • Needs a very big piece of sea to be cost effective
  • Cannot be used inland
  • Barrage systems require salt resistant parts and lots of maintenance
  • Affects the lives of the people who rely on fishing for a means of living
  • Limited because the tide never speeds up or slows down, and occurs on 6 hour cycles. It is also dependent on the fetch distance. The fetch is the distance the tide rises and falls, so some beaches have a very small fetch, and others have a big fetch but hardly any have a large enough fetch to support tidal energy
  • Tidal energy is currently more expensive to generate than conventional energy or that from many other renewable sources.
  • Effects on marine life during construction phases.
  • Operation and control must be provided remotely and maintenance is complicated due to sea-basing of the generation facilities.
  • Sea-based moorings and towers to hold the generators must be placed on the sea bottom.
  • The generating facilities and mooring infrastructure are potential navigational hazards.
  • Is only available in a small number of regions - it requires a basin or gulf that has a mean tidal amplitude of 7 meters or more. Also need semi-diurnal tides where there are two high and low tides everyday.
  • Even with the best barrage designs, fish mortality rate per pass through the barrage is about 15%. Solutions to this problem have either failed or are too impractical and too expensive.
  • Dams used in the production of tidal power can raise tide levels.
  • Damages like reduced flushing, winter icing and erosion can change the vegetation of the area and disrupt the balance.
  • Expensive to construct
  • Power is often generated when there is little demand for electricity
  • Barrages may block outlets to open water. Although locks can be installed, this is often a slow and expensive process.
  • Barrages affect fish migration and other wildlife- many fish like salmon swim up to the barrages and are killed by the spinning turbines. Fish ladders may be used to allow passage for the fish, but these are never 100% effective. Barrages may also destroy the habitat of the wildlife living near it
  • Barrages may affect the tidal level - the change in tidal level may affect navigation, recreation, cause flooding of the shoreline and affect local marine life
  • Causes a continual loss of mechanical energy in the Earth-Moon system (Due to pumping of water through the natural restrictions around coastlines and viscous dissipation at the seabed and in turbulence.
  • Loss of energy has caused the rotation of the Earth to slow in the 4.5 billion years since formation losing 17% of its rotational energy.
  • May take additional energy from the system, increasing the rate of slowing over the next millions of years.

How does a tidal work?

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Asked by Wiki User

When the tide is high. It intakes water. When the tide is low. It releases the water, spinning turbines, therefore creating power.

How does tidal electric power plant work?

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Asked by Wiki User

its a waste of money and it does not work

When are the tidal currents strongest?

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When are the tidal currents strongest?

How much produces the highest electricity in hydro generator?

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Asked by Nagendraprasad961

typical power plant generators produce from 50KVAC to 150KVAC regardless if they are hydro, coal, natural gas, etc.

What causes tides and what affects their heights?

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Asked by Wiki User

Tides are caused by the interaction of Earth, the moon, and the sun. Changes in the positions of Earth, the moon, and the sun affect the heights of the tides during a month.

Why is geothermal energy so important?

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Asked by Wiki User

It is clean, free and green. In other words, it uses the heat from deep below the earth to generate electricity that has no carbon dioxide emissions, which are harmful to the earth and are causing global warming.

Geothermal energy, and green technologies like it, are important because they are low-risk, low-impact energy sources for us to use without polluting the environment. Geothermal Technology is better for the environment and your home. There are many advantages of Geothermal Technology. The underground loop carry warranties of 25 to 50 years! According to the U.S. Department of Energy, if just 100,000 homes converted to a geothermal heating and cooling system, carbon dioxide emissions could be reduced by 880 million pounds.

Can you use tidal power in everyday life?

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Asked by Wiki User

Tidal power produces electricity, the same electricity that you use in everyday life.

Some countries are planning systems that will use the tides as a source of renewable energy. That is an extremely good idea.

Is Tidal Energy expensive?

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Asked by Wiki User

It, depends on if you mean is it expensive to start up or to run, because once you have started the tidal energy up, it is free to run (costs no money to run)

What are the advantages of tidal barrages?

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Asked by Wiki User

no sea, no tides, so no TIDAL BARRAGES :D

What are the advantages and disadvantages of high tide water?

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Asked by Wiki User

Following advantages of high tides may be considered on priority.

1. It helps in navigation.

2. It is also helpful for producing more tidal energy to wider variation in wave guides amplitudes.

3. It also help for fishing, since more fish and prawns come at sea sore.

4. More items from sea like shells etc come out at sea sore during high tides which is advantageous to local business community.

Swechchha singh, Jodhpur

How is tidal energy?

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Asked by Wiki User

it is caused by the shocks of an earthquake and the earthquake is caused by the movements of the plates at the bottom of the earth