Multi Function Wave Energy Devices

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INTERNATIONAL CONFERENCE

on

Port Engineering and

Coastal Development

MULTI FUNCTION WAVE

ENERGY DEVICES

AMETUNIVERSITY(Under Sec.3 of UGC Act 1956) 21st & 22nd February 2012

DANIAL CHAKKARAVARTHY. ASecond Year

Harbour Engineering & Offshore Technology


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Nature has its OWNBALANCE,When it is disturbed it finds a NEW BALANCE.

The Consequence of this REBALANCEis to be understood before we disturb the Balance.

From the work done for Rebalancingwe thus can HARNESS the ENERGY


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COASTAL EROSION A MAJOR CONCERN

Coastal Erosion is the wearing away of land and the removalof beach or dune sediments by wave action, tidal currents, wave

currents, or drainage (also thereby beach evolution).

Waves, generated by storms, wind, or fast moving motor craft,

cause coastal erosion, which may take the form of long-term losses of

sediment and rocks, or merely the temporary redistribution of coastalsediments; erosion in one location may result in accretion nearby.

The waters of the oceans can produce two types of energy: thermal

energy from the sun's heat, and mechanical energy from tides andwaves. We can harness the Wave Power due to the transport of energy

by ocean surface waves and convert it into Energy to do useful work.

Machinery able to convert is a wave energy converter (WEC).


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Environmental Considerations

Positive or negative impacts on marine habitat (depending on

the nature of additional submerged surfaces, above-water platforms,

and changes in the seafloor)

Toxic releases from leaks or accidental spills of liquids used in

those systems with working hydraulic fluids

Visual and noise impacts (device-specific, with considerable

variability in visible freeboard height and noise generation above and

below the water surface)

Conflict with other sea space users, such as commercial shipping

and recreational boating


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Waves are caused by the wind blowing over the surface of the ocean. In many areas of

the world, the wind blows with enough consistency and force to provide continuouswaves. There is tremendous energy in the ocean waves. Wave power devices extract

energy directly from the surface motion of ocean waves or from pressure fluctuations

below the surface. Wave power varies considerably in different parts of the world, and

wave energy cannot be harnessed effectively everywhere.

Ocean wave energy is captured directly from surface waves

or from pressure fluctuations below the surface.


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The Aguadoura Wave Farm was the world's first wave farm (Nov

2008). It was located 5 km offshore near Pvoa de Varzim north of

Oporto in Portugal. The farm was designed to use three Pelamis wave

energy converters to convert the motion of the ocean surface waves

into electricity, totalling to 2.25MW installed capacity.

Pelamis bursts out of a wave


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Wave technologies have been designed to be installed in near shore,

offshore, and far offshore locations. Offshore systems are situated in

deep water, typically of more than 40 meters.

While all wave energy technologies are intended to be installed at or

near the water's surface, they differ in their orientation to the waves

with which they are interacting and in the manner in which they convert

the energy of the waves into other energy forms, usually electricity.

Ocean Wave Energy Technologies

A point absorber is a floating structure with

components that move relative to each other

due to wave action.

(e.g., a floating buoy inside a fixed cylinder)

The relative motion is used to drive hydraulic

or electromechanical energy converters.

Point Absorber Wave Energy Farm


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Terminator devices extend perpendicular to the direction of

wave travel and capture or reflect the power of the wave. These devices

are typically onshore or near shore; however, floating versions have

been designed for offshore applications.

Wave Farm Made Up of Permanent Magnet Linear Generator Buoys


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The oscillating water column is a form of terminator in which

water enters through a subsurface opening into a chamber with air

trapped above it. The wave action causes the captured water column to

move up and down like a piston to force the air though an opening

connected to a turbine.

Attenuators are long multi-segment floating structures oriented parallelto the direction of the waves. The differing heights of waves along the

length of the device causes flexing where the segments connect, and

this flexing is connected to hydraulic pumps or other converters.

Attenuator Wave Energy Device

Source: Ocean Power Delivery, Ltd.


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Overtopping devices have reservoirs that are filled by incoming

waves to levels above the average surrounding ocean. The water is then

released, and gravity causes it to fall back toward the ocean surface.

The energy of the falling water is used to turn hydro turbines.

Specially built seagoing vessels can also capture the energy ofoffshore waves. These floating platforms create electricity by funneling

waves through internal turbines and then back into the sea.

Prototype Overtopping

Device Wave Dragon


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http://ocsenergy.anl.gov/guide/wave/index.cfm

Surge Driveis an innovative wave power technology which harnesses

the energy of ocean waves to produce calm water around the structure

, electricity or desalinated water.


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Countries utilizing this system


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How it works?

Surge Drive wave farm, the drives move in oscillation and the system

transfers the pure wave forces out of the water, via tension transfer

elements

the energy conversion module is able to use these forces to generate

electricity or desalinated water, using an innovative mixture of designand 'off the shelf' components.

This dramatically simplifies the capture of wave energy because

most components are above water and underwater components areminimized and simplified.


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Stable water


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Floating material


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Inside view

SALIENT FEATURES


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SALIENT FEATURES

High Power Extraction:

The floating modules are in the high energy surface region and can adjust

for optimal generation with changing tide and storm surge levels.

Low Capital & Maintenance Costs:

The higher maintenance components of the Surge Drivesystem

are out of the water resulting in significantly reduced capital andmaintenance costs.

Storm Survivability:

During extreme storm conditions, the Surge Drive control system

automatically repositions the buoyancy modules to avoid storm

damage and yet enable the continued generation of power.


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Storm survivability system


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ADVANTAGES:

Less expensive, corrosion resistant material

Maintenance costs is very low

The system is not only survive storms but it is capable togenerate electricity due to its mechanical action.

Storm survivability system easy to make water stable around

the offshore structures.

System provides conversion of energy like wave to

mechanical energy and mechanical energy to electrical

energy

DISADVANTAGES:

the system disturbs the ocean environment Implementation requires skilled labours


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CONCLUSION:

Due to Human Habitat and the connected activities thereon have

created ECOLOGICAL IMBALANCE.

As the Non - Renewable Energy source depletion and energy demand

increasing alarmingly newer and newer methods to harness all available

sources of Renewable and Sustainable Energy is given impetus and

prime importance.

Wave Energy is one such source to effectively harness.

Although Wave Energy has tremendous potential still all conversionmethods are in the Pilot Study Stage Only.


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Acknowledgement

Materials have been freely taken from the Internet and otherProprietary Sources. I totally acknowledge with gratitude to

the authors and companies here. Aqua genSite:[email protected]
mailto:[email protected]:[email protected]

Multi Function Wave Energy Devices

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