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1. (WO2010011133) A DEVICE FOR THE UTILISATION OF WAVE ENERGY AND A METHOD
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C L A I M S

1. A device for the utilisation of wave energy, which device comprises

- a Darrieus rotor having at least two Darrieus rotor blades, wherein the Darrieus rotor has a solidity σD, and

- a Wells rotor having at least two Wells rotor blades, wherein the Wells rotor has a solidity σW, wherein

- the Darrieus rotor and the Wells rotor are rotatable about a common axis of rotation A, and

- σW is larger than or equal to σD .

2. The device according to claim 1, wherein σW is at least 15% larger than σD, and preferably at least 25% larger.

3. The device according to claim 1 or 2, wherein at least one Wells rotor blade is directly connected to a Darrieus rotor blade.

4. The device according to claim 3, wherein the distal end of the Wells rotor blade is connected to the Darrieus rotor blade.

5. The device according to any of the preceding claims, wherein the device contains a generator selected from i) a generator for generating electricity, and ii) a generator for generating hydraulic pressure.

6. A method for generating energy by the utilisation of wave energy, wherein a device according to any of the claims 1 to 5 is placed in a body of water in which waves occur naturally.

7. A method according to claim 6, wherein the Wells rotor blades are situated at a depth between 0.5 and 2.0, preferably between 0.8 and 1.25 times the 5-minutes' average wave height below the level of the body of water.

8. A method according to claim 6 or 7, wherein the upper ends of at least two Darrieus blades extend to above twice the year-average wave height.

9. A method according to any one of claims 5 to 8, wherein the 5-minutes' average of the axis of rotation is in an orientation of less than 5° to the vertical.

10. A method according to any one of claims 5 to 9, wherein en-ergy selected from hydraulic energy, electricity or hydrogen gas is generated.