Water wave energy harvester
A wave energy harvester includes an elongated coupler that extends horizontally above a body of water. The coupler includes a conveyor that translates along its length. Disposed on the conveyor a plurality of vanes that, when between the coupler and the water, are contacted by the peaks of waves passing beneath the coupler, resulting in the translation of the vanes and the conveyor. Translation of the conveyor rotates an output that performs work to store the harvested kinetic energy to stored energy and/or to use it for other purposes, such as in power generation.
1 . An apparatus for harvesting kinetic energy from wave peaks comprising:
a wave coupler;
a support frame for positioning the wave coupler above a body of water to permit water waves to propagate beneath the wave coupler; and
a plate coupled to the support frame below the wave coupler, the plate including a front plate end proximate a front end of the wave coupler and a back plate end proximate a back end of the wave coupler,
wherein the wave coupler comprises:
a closed-loop conveyor mounted to the support frame, the conveyor configured for translating along a front-to-back path on an underside of the wave coupler from the front end of the wave coupler to the back end of the wave coupler and returning to the front end of the wave coupler along a back-to-front path on a top side of the wave coupler;
a plurality of spaced-apart wave contacting surfaces connected for movement with the conveyor that are positioned below the conveyor as it translates along the front-to-back path to contact with water waves passing beneath the wave coupler, a force of impact from water waves on the wave contacting surfaces being transmitted to the conveyor;
a rotational output coupled with the conveyor that rotates in response to movement of the conveyor
wherein the plate slopes toward the wave coupler as it extends from the front plate end to the back plate end.
2 . The apparatus of claim 1 , wherein the conveyor comprises one or more chains or cables to which the wave contacting surfaces are connected.
3 . The apparatus of claim 1 , wherein the conveyor defines a substantially solid, continuous surface.
4 . The apparatus of claim 1 , further comprising a shield extending over the front end of the conveyor to block waves from impacting wave contacting surfaces positioned along the back-to-front path.
5 . The apparatus of claim 1 , further comprising a plurality of spaced-apart vanes connected for movement with the conveyor, wherein each of the plurality of vanes defines one of the plurality of wave contacting surfaces.
6 . The apparatus of claim 5 , wherein each vane is connected to the conveyor by a hinge to permit the vane to articulate selectively about a fixed point.
7 . The apparatus of claim 5 , wherein each of the plurality of vanes is adapted for connection with the conveyor to vary a distance that each vane extends below the conveyor along the front-to-back path.
8 . The apparatus of claim 5 , wherein the wave contacting surface of each vane becomes progressively lower with respect to the support frame as it moves along the front-to-back path.
9 . The apparatus of claim 5 , wherein each of the plurality of vanes is adapted for adjustment of one at least its geometry or orientation.
10 . The apparatus of claim 1 , wherein the wave coupler is oriented with respect to the frame such that the front end of the wave coupler is higher than the back end of the wave coupler.
11 . The apparatus of claim 10 , further comprising an actuator coupling the wave coupler to the support frame, wherein the wave coupler defines a longitudinal axis passing through the front end and back end thereof, and wherein the orientation of the longitudinal axis relative to the frame is adjustable by adjusting the actuator.
12 . The apparatus of claim 10 , further comprising an actuator coupling the wave coupler to the support frame and a controller configured to actuate the actuator to adjust at least one of the height and the orientation of the wave coupler based on changes in wave heights as they propagate from front to back under the wave coupler to optimize contact between waves and the wave contacting surfaces.
13 . The apparatus of claim 1 , further comprising an energy converter coupled with the rotational output.
14 . The apparatus of claim 1 , further comprising a controller responsive to one or more of: predicted or actual measurements of conditions indicative of expected or actual direction of propagation of waves, mean wave heights, median wave heights, the force of impact of waves on one or more of the wave contacting surfaces, and a speed of movement of the conveyor; the controller, in response, generating one or more outputs to adjust any one or more of: the orientation of the conveyor, the height of the conveyor, the path of the conveyor, an orientation of the wave contacting surfaces, a length of the wave contacting surfaces, and a shape of the wave contacting surfaces.
15 . The apparatus of claim 1 , further comprising an actuator coupling the wave coupler to the support frame, the actuator being adjustable to shift at least one of a height and an orientation of the wave coupler relative to the support frame.
16 . The apparatus of claim 15 , wherein the actuator is one of a plurality of actuators coupling the wave coupler to the support frame, the plurality of actuators being adjustable to shift at least one of the height and the orientation of the wave coupler relative to the support frame, with the wave contacting surfaces are configured to move along at least one of a straight path or a curved path.
17 . An apparatus for harvesting kinetic energy from wave peaks comprising:
a wave coupler;
a support frame for positioning the wave coupler above a body of water to permit water waves to propagate beneath the wave coupler;
a converter configured to convert kinetic energy of the wave to potential energy; and
an energy store capable of storing the potential energy:
wherein the wave coupler comprises:
a closed-loop conveyor mounted to the support frame, the conveyor configured for translating along a front-to-back path on an underside of the wave coupler from a front end of the wave coupler to a back end of the wave coupler and returning to the front the end of the wave coupler along a back-to-front path on a top side of the wave coupler; and
a plurality of spaced-apart wave contacting surfaces connected for movement with the conveyor that are positioned below the conveyor as it translates along the front-to-back path to contact with water waves passing beneath the wave coupler, a force of impact from water waves on the wave contacting surfaces being transmitted to the conveyor; and
a rotational output coupled with the conveyor that rotates in response to movement of the conveyor, the rotational output coupled to the converter.
18 . The apparatus of claim 17 , wherein the wave coupler is one of a plurality of wave couplers each including a closed-loop conveyor, a plurality of spaced-apart wave contacting surfaces, and a rotational output, wherein the rotational output of each of the wave couplers are coupled together to perform work.
19 . A method of harvesting energy from kinetic energy of waves on a body of water with a wave coupler, comprising:
supporting with one or more frames, at least one elongated, closed-loop conveyor in a generally horizontal orientation above a body of water to permit waves on the body of water to pass beneath it;
coupling movement of the conveyor with at least one rotational output and a converter configured to convert kinetic energy of the wave to potential energy;
performing work with the rotation of the at least one rotational output to convert kinetic energy of the wave to potential energy;
storing the potential energy in an energy store,
wherein the conveyor is configured for translating along a front-to-back path on an underside of the wave coupler from a front end of the wave coupler to a back end of the wave coupler and returning to the front end of the wave coupler along a back-to-front path on a top side of the wave coupler; and
wherein the wave coupler further comprises a plurality of spaced-apart vanes connected with the conveyor for movement with the conveyor when translating along the front-to-back path, the plurality of vanes extending downwardly from beneath the conveyor for contact with water waves passing beneath the coupler and transmit a force of impact of the water waves on the vanes to the conveyor.
20 . The apparatus of claim 17 , further comprising an actuator coupling the wave coupler to the support frame, the actuator being adjustable to shift at least one of a height and an orientation of the wave coupler relative to the support frame.