A shutter valve for alternatingly allowing and stopping a high pressure water flow, such as in a device for generating energy from sea waves, comprising a tube section (201) having a rectangular cross section, wherein a multitude of vanes (202) are rotatably mounted in the tube section (201), wherein the vanes have a relatively large rectangular longitudinal cross section in a first direction, a relatively flat rectangular longitudinal cross section in a second direction perpendicular to said first direction, and a generally flat cross section in a third direction perpendicular to said first and second directions, said third direction being the axis of the vane (202), wherein the circumferential wall around the axis of each vane forms a closed water impermeable surface, wherein the axes of said multitude of vanes all extend in a parallel manner, characterized in that the distances between the axes of adjacent vanes are approximately half the distance between the outer tips of the vanes, seen in the cross section in said third direction, such that when the vanes are rotated to the closed position the lower half of the front surfaces and upper half of the back surfaces of all vanes form a single closed front surface and a single closed back surface, each in substantially a single flat plane perpendicular to the flow axis of the valve, said surfaces closing the opening of said tube section, and the other half of said front surfaces and the other half of said back surfaces of said vanes rest against each other.

A hydropower system includes hydraulic ram system with a pressure vessel having a one-way inlet valve and an outlet valve controlling the release of pressurized water from the pressure vessel for use in a water turbine for providing electricity. A hydropower system may have two or more hydraulic ram systems with a first system feeding a first water turbine and a second and third system feeding a second water turbine. One or more siphons are provided to assist water flow, and an overflow pressure vessel captures and pressurizes waste water from the first hydraulic ram system for use in the third system, which releases pressurized water for the second water turbine. The second hydraulic ram system accepts spent water from the first water turbine and releases pressurized water for the second water turbine.

Wind driven apparatus is provided including upright support means and a plurality of wind directing wall members protruding outwardly from the upright support means at spaced apart intervals. The area between two adjacent wind directing wall members creates a wind collection section for collecting and directing wind in use. At least one opening is defined in the upright support means in each wind collection section for allowing wind, air and/or air pressure collected in the wind collection section to pass through said at least one opening and into an inner compartment defined in the upright support means. Drive shaft means provided in the inner compartment of the upright support means and rotatable means provided on and/or associated with the drive shaft means are rotatable as a result of air pressure and/or air flowing into the inner compartment via said at least one opening. Rotation of the drive shaft means can be used to drive electricity generating means, hydraulic pump means and/or drive transmission means in use.

A hydraulic rotating machinery (HRM) system provides optimal energy efficiency over a very wide conditions of service (COS) range by configuring a plurality of variable speed HRMs in a cluster. The HRMs are interconnected by one or more valves that can be actuated by a controller to configure and vary a flow path through which a process fluid flows from an inlet to an outlet. By actively selecting which of the HRMs are included in the flow path, the interconnections therebetween, and the operating speeds thereof, the controller ensures that the HRM cluster continues to operate at optimal efficiency as the COS fluctuates over a very wide range. The HRMs can be identical to each other, or can vary in design. The HRM system can be implemented for storage and retrieval of green energy. The controller can also monitor the health of the cluster and/or of the associated process.

Provided is a buoyancy engine (10) comprising a support frame (12) and at least two pairs of reciprocating arrangements (14) supported on said support frame (12). Each reciprocating arrangement (14) comprises i) a fluid cylinder (16) operatively filled with a fluid, such as water; ii) a float (20) arranged within the fluid cylinder (16) and defining a reservoir (22) with an exhaust valve (24) located at an upper portion and a charging aperture (26) at a lower portion via which said float (20) is chargeable with air; iii) an air injection assembly (28) comprising a pump (30) and an injection conduit (32), the pump (30) linked to the float (20) so that said pump (30) draws atmospheric air when the float (20) descends and charges said air via the injection conduit (32) when the float (20) ascends; iv) a force multiplier assembly (38) supported on the frame (12) and configured to apply mechanical advantage between the float (20) and the pump (30); and v) a power take-off (40) linked to the float (20) and configured to transfer energy from the float (20) as said float (20) ascends within the cylinder (16). Engine (10) further includes a flywheel (42) arranged on the support frame (12) and coupled to the respective power-take offs (40). In this manner, each pair of reciprocating arrangements 14.1 and 14.2 are opposedly arranged with their floats (20) linked in a reciprocating manner, wherein each air injection assembly (28) is arranged to inject air into the float (20), via the charging aperture (26), of an adjacent reciprocating arrangement (14) of the other pair, to facilitate continuous actuation of the flywheel (42) as the engine (10) operates.

A system for generating electrical power may include a flowline having an inlet that receives reservoir fluid at a first pressure, an outlet that outputs the reservoir fluid at a second pressure, a first flow path between the inlet and the outlet, and a second flow path between the inlet and the outlet, in parallel with the first flow path. The difference between the first pressure and the second pressure may include a pressure differential, and the system may include a valve that adjusts the pressure differential. Additionally, the system may include a turbine disposed along the second flow path that generates mechanical energy from a flow of the reservoir fluid induced by the pressure differential, and the mechanical energy may be converted to electrical energy.