hydrokinetic technologies technical and environmental ... · the wave dragon case erik friis-madsen...

Overtopping Wave DevicesWave Dragon ApS/Ltd

HWETTEI - WorkshopOctober 26-28, 2005, Washington, DC

Hydrokinetic Technologies Technical and Environmental Issues Workshop

the Wave Dragon caseErik Friis-MadsenWave Dragon ApSCopenhagen, DK

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

Copenhagen, DK

Jens Peter KofoedHydraulics and Coastal Engineering

Aalborg University, DK



Regions where wave energy is most feasible

1 TW 60o

30o

0o

30o

60o

The western wind belt with the wave energy density in kW/m



Wave Energy Conversion Techniques

Buoy

Seabed

Wave Direction

Heaving Devices Rambøll, Denmark1:10 tests in open sea, 1:4 scale model (2.5 m diameter)OPT, USA, 2004

Teamwork Technology BV, The Netherlands2 MW pilot plant deployed 2004 in Portugal



Buoyant segments

Seabed

Wave Direction

Pitching Devices

Pelamis, Ocean Power Delivery Ltd (OPD), ScotlandTank tests in small scales (1:80, 1:35, 1:20)Open sea tests 1:7 (2001), 1:1 (2004), 750 kW scheme




Air Column

Wells Turbine

Seabed

Concrete Structure

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)





Wave direction

Kaplan Turbine

ReservoirGenerator

Seabed

Buoyancy

Overtopping Devices

Pilot plant deployed in ‘80s Sweden, Sea Power Intl., 15-year contract for 1.5 MW, Shetland.

Pilot plant 1:4½ deployed 2003 Denmark, Wave Dragon ApS, Prototype 1:1 planned by 2005 Wales, UK.



Fixed wave energy devices



Floating wave energy devices



Tapchan



SSG (Seawave Slot Cone Generator)



Wave Dragon principle

Turbine outlet

Reservoir

Waves overtopping the doubly curved ramp

The Wave Dragon is a slack-moored wave energy converter that can be deployed 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



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 Risø

Target year 2016



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



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



Nissum Bredning, DenmarkThe wave climate is – like the test rig - scale 1:4.5 of the North Sea.

2



Remote control



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

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



Wild life



Cylinder gate turbines running



Power plant size

1 450 5 0 67 6 7

1 0 013 3

2 0 02 50

4 0 0

66 7

1 0 0 0

0

5 01 0 01 5 0

2 0 02 5 03 0 0

3 5 04 0 04 5 0

5 0 05 5 06 0 0

6 5 07 0 07 5 0

8 0 08 5 09 0 0

9 5 01 0 0 0

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



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

hydrokinetic technologies technical and environmental ... · the wave dragon case erik friis-madsen...

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