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Presentation on wave energy

by A.CHANDRAKANTH P.ASHOK KUMAR 11631A0209 11631A0204 II EEE II EEE SRI VENKATESWARA ENGINEERING COLLEGE

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Wave energyWhat is wave energy?Energy obtained by harnessing wave power is called wave energy.

What is a wave?A disturbance that travelsthrough medium from onelocation to another location.

History :

During the 1990s gasoline crisis wave power was published in order to be a good long term energy solution.There were not many wave power plants actually implemented ,it has proven to be a benefit to modern resolutions with current power crises.Fuel prices are rising exponentially & the greenhouse effect is having potentially disastrous effects on environment.

Why renewable energy?The increasing demand for energy by developing and expanding economies &the recognized impacts of the emission from fossil fuels on the environment.Renewable source of energy are becoming more attractive especially as the prices of traditional sources of energy become more expensive. Renewable energy from wind, solar, and water power emits no pollution or carbon dioxide.Renewable energy is nonpolluting since no combustion occurs.The renewable energy sources are used especially for electrical power generation.

How waves are created?

Waves are generated by winds blowing over the ocean surface.Among different types of ocean waves wind generated waves have the highest energy concentration.Once the wind waves are created they can travel thousands of kilometers with little energy losses.Ocean waves encompass two forms of energy ,the kinetic energy of the water particles &the potential energy of elevated water particles.

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Principles and aspects of wave energy conversionOscillating water columns : These are partially submerged, hollow structures open to the seabed below the water line.Overtopping devices: floating are fixed to the shore that collect the water of incident waves in an elevated reservoir to drive turbine.Heating devices : which provide a heave motion that is converted by mechanical systems.pitching devices:These consists of number of floating bodies, hinged together across their beams.

METHODS OF WAVE ENERGY COLLECTIONThe simple method is to use a water piston.This is basically an open tube placed vertically in the sea.The top end is connected to a series of air hoses ,the lower end is placed no deeper than 2m down below the surface of the sea.As waves passes the tube their kinetic energy makes the water inside the tube rise &fall in sympathy with them.

Electricity generation from wave energy A linear generator is the easiest solution but the least efficient.The bidirectional oscillating air flow from the water piston is switched by a series of valves to provide a unidirectional flow through a Turbine . The turbine is connected to a dc generator to provide the electrical power output.

An offshore buoy farm

Initial prototype was 50 Watts: Scaled capacity for a 12 x15 foot cylinder is 250 KW (on paper) 4000 for 1000 MW farmPrinciple Advantage: Can Withstand severe Weather

Design considerationsNo complex mechanical or electrical equipment should be located at the ocean surfaceThe device must deliver energy continuouslyEnergy storage should preferably be a future of the designControl of wave device should be land-basedIt must be possible to remove surface mounted equipment from the path of severe storms The device should be of the terminator type to optimize energy harvesting.

AdvantagesLow costZero pollutionSignificant energy productionEasily predictableZero waste ,renewable &safeAbundant &widely variable.

DisadvantagesConstruction cost maintenance due to environment is highNoise

All these studies have confirmed the suitability of the resources for utilization for various purposesPlans are being made to undertake further research and development studies in the area of wave energy conclusion