08 Over Topping Wave Devices

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Overtopping Wave Devices

Wave Dragon ApS/LtdHWETTEI - WorkshopOctober 26-28, 2005, Washington, DC

Hydrok inetic Technologies Technical and

Environmental Issues Workshopthe Wave Dragon case

Erik Friis-MadsenWave Dragon ApS

Copenhagen, DK

H. C. Soerensen and Lars ChristensenSPOK/Wave Dragon ApS

Copenhagen, DK

Jens Peter KofoedHydraulics and Coastal Engineering

Aalborg University, DK


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Regions where wave energy is most feasible

1 TW 60o

30o

0o

30o

60o

The western w ind bel t w ith the wave energy density in kW/ m


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Wave Energy Conversion Techniques

Buoy

Seabed

WaveDirection

Heaving Devices Rambll, Denmark1:10 tests in open sea, 1:4scale model (2.5 m diameter)

OPT, USA, 2004

Teamwork Technology BV,The Netherlands

2 MW pilot plant deployed2004 in Portugal


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Buoyantsegments

Seabed

WaveDirection

Pitching Devices

Pelamis, Ocean Power Delivery Ltd (OPD), Scotland

Tank tests in small scales (1:80, 1:35, 1:20)

Open sea tests 1:7 (2001), 1:1 (2004), 750 kW scheme



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Air Column

WellsTurbine

Seabed

ConcreteStructure

Air Flow

Generator

Wave

Direction

Oscillating Water Column

400 kW (1998), Pico Island (Azores)Fully automated, full-scale testing facility

500 kW shoreline OWC (2000)Islay (Scotland)



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Wave

directionKaplanTurbine

ReservoirGenerator

Seabed

Buoyancy

Overtopping Devices

Pilot plant deployed in 80s Sweden,Sea Power Intl.,

15-year contract for 1.5 MW, Shetland.

Pilot plant 1:4 deployed 2003 Denmark,Wave Dragon ApS,

Prototype 1:1 planned by 2005 Wales, UK.


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Fixed wave energy devices


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Floating wave energy devices


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Tapchan


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SSG (Seawave Slot Cone Generator)


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Wave Dragon principle

Turbine outlet

Reservoir

Waves overtopping thedoubly curved ramp

The Wave Dragon is a slack-moored wave energy converter that can bedeployed alone or in parks wherever a sufficient wave climate and a water

depth of more than 20 m is found.

Climate Power production24 kW/m 12 GWh/y/unit36 kW/m 20 GWh/y/unit48 kW/m 35 GWh/y/unit

Wave reflector


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Wave Dragon objectives

To develop Wave Dragon to a power plant unit of4 to 11 MW with a production price of 0.04 /kWh

0,00

0,05

0,10

0,15

0,20

0,25

0,30

0,35

1985

1987

1989

1991

1993

1995

1997

1999

2001

2003

2005

/kWh Wind

Wave

Source:

EU Wave Net 2002 and Ris

Target year 2016


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WD turbine 340mm runner has been tested.The efficiency is very high (>90%) and the noise level is very low.


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The Wave Dragon scale 1:4.5prototype is deployed in a birdprotection area (Ramsar)


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Nissum Bredning, Denmark

The wave climate is like the test rig - scale 1:4.5 of the North Sea.

2


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Remote control


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Marine growthMarine growth on structure and mooringlines below waterline: 5-10 cm

Marine growth in turbine draft tubes reduces PTO. Non-toxic antifouling tested.


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Wild life


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Cylinder gate turbines running


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Power plant size

1 450 50 67 67

1 00133

2 00250

40 0

667

1000

0

5 01 0 0

1 5 0

2 0 0

2 5 0

3 0 0

3 5 0

4 0 04 5 0

5 0 0

5 5 0

6 0 0

6 5 0

7 0 0

7 5 0

8 0 0

8 5 0

9 0 0

9 5 0

1 0 0 0

N o . o f u n its t o fo rm a 100 M W p o w e r p lan t


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The Wave Dragon Vision

Seen from 100 feet above sea level and at a distance of 3 miles

One and a half year operational experience

Wave energy absorption performance verified

Offshore wave energy is a reality

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08 Over Topping Wave Devices