Monday, 15 March 2010

Tidal Energy

Tidal energy or energy Moyotee:-
kind of kinetic energy that is storedin the currnets caused by tides resulting naturally from the moon's gravity and the sun and the earth's rotation on its axis and therefore this energy is classified as renewable energy.
Many coastal States began to take advantage of this kinetic energy to generate electricity, thus relieving the pressure on the thermal power plants, reduce pollution and the result of the thermal power stations run on coal or oil.

Methods of exploitation:-

There are two basic ways to generate electricity using the phenomenon of tidal:-
1-Way the construction of dams:-As a port in the Rance station in France, which was built in 1966 and operates 240 MW power.
2-Horoscopes method:-Adopt that method to install a fan or Two fans blow on the tower, which will be a solid fan beneath the surface of the water.

Terms of use and economic benefit:-

They have to be high tide at least 5 meters, so there is the world's 100 sites available where this condition. Also use this technology in salt water shows the metal pieces used to rust and therefore does not need to care and maintenance of permanent and this could raise the cost and thus lower profit.


The first and largest factory built in 1961 in Saint-Malo France, came into force in 1966 and a high tide in this region between 12 and 16 meters, the French to build a dam 750 meters long and going by the lake area of 22 square kilometers and a capacity of 184 million square meters in this Dam 24 slot, and generating capacity equal to 600 million kilowatt hours annually, is also worth mentioning that this dam is used for water storage by the principle of surplus electricity from other laboratories in non-peak hours to re-use of these energy stored in water at peak times.

The proportion of exploitation:-

The rate of exploitation of currents to the 80 per cent if the course using the latest technology and compared with the proportion of exploitation in the thermal gradient is a very high percentage.


This energy have received a "friendly environment" is not issued any gas or toxic waste as they take into account many of the fisheries research tried to play down the risks that might be exposed as fish passing near the turbine could have already reduced the proportion of the French damage to fish passing from 15 percent to 5 percent.

Of the dangers posed to fish passing through:-
1 - low pressure .
2 - Collision Balemraouh etc.

The whole world looks to alternative sources of conventional energy (coal - gas - fuel) clean and renewable energy were these aspirations to the sources available around the sun - wind - water. The oceans and seas, and had long had the potential source of alternative energy in the ocean carrying capacity in the form of tides and waves and water currents as the world depends on 90% of its electricity on the traditional sources and there are some countries which were the first to use such modern technology, such as France and England United States of America.
Forty years ago there was a fixed interest in harnessing the power of the tides has been to focus attention on the estuaries, where large volumes of expressing the water through narrow channels, which increases the speed of flow, but there was a large environment problems faced scientists for the implementation of this technique, in the nineties was the spread of fences in tidal channels between small islands and it was a choice more effective than being on the estuaries. Hypothesis and other potential for energy from the oceans and seas is to rely on the temperature difference between surface and deeper waters of this method is still under study, is still industrial technology equipment for tidal energy at the beginning, there will be a long time before you submit a contribution to this new energy to generate energy or used for commercial exploitation, generating energy by using the flow of water is not a new idea has recorded in French GIRARD first patent ever use an energy wave in July 1799.

Parts and components of the tidal stations island:-

Principle of the tidal stations is very similar to what plants to hydropower dam in the station tidal much larger than the water station. The tidal station consists of the following major components:-

1-Basin-range, or downstream to find the right place that contains the downstream essential to the success of this station and the spillway is not man-made and it is normal.
2-This term the checkpoint barrier looks like a wall that separates the basin range from the rest of the sea bottom of this barrier will be installed on the seabed and the top of the barrier above the highest level that can reach the water from the tidal maximum.
3-Sluice gates, which are areas of the barrier that water can flow free of the estuary and out of these gates are not open on a permanent basis where they are controlled by operators Energy Center be appropriate to determine the flow of water to the turbines and tidal these portals do not have a specific location on the barrier term.
4-These same tidal turbines turbines arranged within the barrier range and settle near the bottom of the sea floor and are designed in a manner similar to the turbine steam turbine. Turbines are located between the position of the sluice gates on both side of the sea and the estuary of the barrier-range when you open the gates through which the water rushes to the turbine for electricity generation in accelerating.

Tidal turbine island:-

There are two types of centers of tidal power generation (in terms of the type of turbine):-
The first type:-Single impact, these centers generate energy from the flow of water through turbines in one direction only, like the steam turbine, where you can not work when there is a steam in the opposite direction. Turbines can not work in these centers only when the passage of water in one direction only.
The Second type:-Influence bilateral working turbine bilateral influence on the same principle the only influence almost as a special session begins with a single effect that the water level in the estuary and lower the water level rises in the sea conditions tidal sluice gates open in front of and behind the turbine to the rush of water through turbines to generate electricity, when the water level inside the estuary the same level of water in the sea close the sluice gates. The water level remains high in the estuary and the water in the sea will reach the state of low tide. When the sea water level drops enough to re-open the gates and behind the turbine and the water flows out through the downstream turbine, generating electricity when the passage of water, turbines will generate a bilateral effect more energy than twice the energy generated by turbines single impact, but in practice can not Turbines bilateral influence to generate this amount because of the loss in time due to the closure and open the sluice gates bilateral effect.

States that benefit from this energy:-

South Korea.
the United States.
New Zlnda.
South Africa.