Abstract: An apparatus for generating electricity from a flowing stream of water is disclosed. A rigid frame is fixed with a pair of wheels, or with two linkages in circuit around two pairs of wheels. A plurality of blades are fixed between the wheel or linkages at their side edges, a cross-sectional area of each blade being substantially comparable to the cross-sectional area of the stream of water. An orientating mechanism is adapted to maintain the orientation of each blade such that rotation of the wheels or linkages results in an opposite rotation of each blade to maintain the orientation of the blade. As such, each blade “stabs” orthogonally into and out of the flow of water edge first, minimizing the displacement and disruption of the water upon entering. Each wheel or linkage, when mechanically coupled with a generator, results in the production of electricity.

Abstract: An underwater placed assembly produces gas or gas and oil/condensate from a subsea gaseous reservoir, where at least one production well is provided from the seabed to a production zone and at least one water injection well is provided from the seabed to an injection zone. The assembly includes: a pressure increasing device connected to the outlet of the production well in order to increase the pressure in a production flow from the production well, and a water turbine that is connected to and driving the pressure increasing device.

Abstract: The invention is an apparatus and method for harnessing wave energy by transforming it in a continuous flow of water to be converted in mechanical energy through a water turbine. The energy wave device maximizes the throughput by discharging the water crest in a continuous flow through turbines into the trough, absorbing the water of the neighboring wave's crest and sharing the facilities.

Abstract: The innovation herein proposed describes a plant to produce electricity by the sea waves. The plant is designed to be installed on shore, near shore and offshore scenarios: on the coast line, in shallow waters and in deep waters. The plant is operated by action of the sea waves on a series of floaters (A). The resultant force on each floater (A) acts on a mechanical load amplifier (B) which moves two vertical high pressure piston pumps (C). These pumps (C) send pressurized fresh water to a hyperbaric system (E). The hyperbaric system (E) supplies an outflow water jet through a controlled valve that moves a conventional turbine (G). This turbine (G) connected to the electric generator (H) produce electricity.

Abstract: In one embodiment, a hydraulic circuit has an input shaft, at least one positive displacement hydraulic pump, a plurality of positive displacement hydraulic motors, and at least one fluid line operatively connecting the at least one positive displacement hydraulic pump to the positive displacement hydraulic motors. In operation, the at least one positive displacement hydraulic pump is placed in an operative condition. At least one of the positive displacement hydraulic motors is also placed in an operative condition. A flow rate of fluid in the fluid line is measured, and the remaining positive displacement hydraulic motors are switched between an operative condition and a bypass condition according to the measured flow rate of the fluid.

Abstract: Systems, methods and apparatus for subjecting high-pressure fluids to a fluid flow assembly that generates or extracts work/energy using a work producing machine. Kinetic energy from the work producing machine is converted to electricity using a generator or similar apparatus.

Abstract: A pressure accumulator (10) to establish the necessary power to drive and operate external equipment is described, such as hydraulic and/or mechanical systems comprising a main body (12) with an inner, longitudinal, main chamber (14) that is divided into several sub-chambers. The inner, main chamber (14) comprises at least three sub-chambers (14a, 14b, 14c) that are separated from each other with the help of mutual, intermediate pistons (16,18), where the first of said chambers is a compensating chamber (14a) arranged to take up the same pressure as the surroundings, the second of said chambers is a gas expansion chamber (14b) encompassing a gas generator (20) with an initiator/detonator (22), and the third of said chambers is a pressure chamber (14c) arranged to be pressurized with the help of the gas expansion chamber (14b) and to exert a force on the external equipment.

Abstract: Systems and methods for recovering power fluid used to power a device under water and for pumping the recovered power fluid to a fluid container above a surface of the water, the method in certain aspects including: flowing fluid from a subsurface apparatus to a subsurface recovery system, the fluid initially provided to the subsurface apparatus to power the subsurface apparatus; and the subsurface recovery system including a pump system for selectively pumping recovered power fluid to a fluid container above a surface of the water, the pump system having at least one pump and, in some aspects, a first pump, a second pump, and a valve system; the valve system controlling the first pump and the second pump to allow only one pump of the first pump and the second pump to pump recovered power fluid to the fluid container above the surface of the water; and pumping recovered power fluid to the fluid container with only one pump at a time.

Abstract: A wave energy converter includes a housing having a forward end and an aft end. Three upstanding air chambers are located in the housing and three corresponding water accommodating ducts extend aft from the air chambers and terminate in aft water accommodating openings for accommodating water into and out of the air chambers as the housing oscillates by pitching in response to passing waves. An air accommodating duct communicates with the air chambers through a manifold for accommodating air into and out of the air chambers as the water level falls and rises within the air chambers as the housing oscillates. A self-rectifying turbine in the air accommodating duct powers an electrical generator. A first stabilizing plate extends forwardly and downwardly from the forward end of the housing for controlling the oscillating motion of the housing.

Abstract: A wind turbine has a rotor; a hydraulic pump coupled to the rotor, two or more variable displacement hydraulic motors which are driven by fluid flow from the hydraulic pump, at least one generator coupled to the variable displacement hydraulic motors and a closed loop hydraulic oil circuit for carrying pressurized oil from the hydraulic pump to the motors and to return oil to the pump from the motors. A controller in the closed loop hydraulic oil circuit controls the flow of oil in the closed loop circuit and displacement in each of the variable displacement hydraulic motors. Control of flow in and out of the motor for each revolution of that motor controls the flow to the hydraulic pump which has a fixed displacement, thereby controlling its rpm, thereby controlling the rotor rpm. A hydraulic accumulator can be provided in the closed loop.

Abstract: Sea Electrical Energy Production (SEEP”) unit (12) is disclosed for using the rise and fall of ocean waves to drive a hydraulic pump (18) which draws water through a turbine (14) to drive an electric generator (16). The crests and troughs of the ocean waves drive the hydraulic pump (18) which both draws suction on and pressurizes a reservoir (50) that receives water discharged from the turbine (14). A suction stroke of the hydraulic pump (18) draws water from the ocean through the turbine (14), through a first one-way valve (54) and into a pressure reservoir (50). A pressure stroke of the hydraulic pump (18) pushes water from the pressure reservoir (50), through the second one-way valve (56) and back into the sea. The turbine (14) is preferably directly connected to the electric generator (16) by gears to increases the rate of rotation of applied to the electric generator (16) when low pressure heads are applied across the turbine (12).

Abstract: The present invention is comprised of a wind powered energy amplification method and systems for capturing wind power and harvesting tangentially amplified energy. The harvested tangentially amplified energy is converted, processed and stored for use for generating continuous, on demand and stand by electricity to supply electricity. The present invention is further comprised of methods and systems for extracting, processing and storing water and carbon dioxide to supply water and supply carbon dioxide.

Abstract: An offshore floating wind farm producing compressed air in varying quantities depending on the wind speed, the compressed air being delivered to a large-volume, thin-walled, underwater storage bladder or tank, the compressed air then being delivered to an electricity-generating power plant to power generators as needed. The system may also include an onshore wind farm that produces compressed air in varying quantities depending on wind speed, the compressed air being delivered directly to the power plant. When compressed air production exceeds the needs of the power plant, the excess compressed air is delivered to the underwater storage tank. When onshore production is inadequate, compressed air is brought from the underwater storage tank to the power plant.

Abstract: A cluster of thrust rods are disposed in a module oriented to extend somewhat beyond the surface of a road or trackway adapted to receive vehicular traffic thereon, the thrust rod fastened to reciprocate in the presence of vehicular traffic and spring biased to return the thrust rod to an original, unstressed position. Each deflection of an associated thrust rod causes a fluid contained within a hydraulic piston/cylinder to be pulsed in response to pressure formed from a piston associated with the thrust rod, the thrust rod operating against spring tensioning to return to its unstressed state. Each fluid pulse is allowed to communicate through a single fluidic line to a second piston/cylinder arrangement having reduced cross section for a pulse of greater intensity and deflection, and spring biased to return to an original, unstressed position simultaneously with the thrust rod.

Abstract: Methods and apparatus for improved power generation through movement of water retrofitting existing hydroelectric dams with draft tube inserts and tailrace walls to increase water velocity for production of power using hydrokinetic turbines installed in the tailrace. By initial design or by draft tube inserts and tailrace walls, increased and streamlined water flow leads to higher efficiencies of the hydrokinetic turbine, thus more efficiently converting available kinetic energy of the water into usable energy.

Abstract: The present invention relates to a centripetally acting type of water turbine which uses low-head and low-speed water flow and which comprises a rotational force generating device having an inner and an outer centripetal canister rotatably supported by means of a stand and a securing shaft either vertically or to left and right in a straight line, and having a plurality of blades fixedly joined in a radiating fashion between the inner and outer centripetal canisters, and in which the combined shape of the inner and outer centripetal canisters and neighbouring individual blades is constituted as a lower surface which inclines such that water or steam flows at an incline downwardly and, as it does so, the rotational radius progressively reduces.

Abstract: Higher pressure exists at the bottom of deep water (including other fluids). This system utilizes machinery to compress a compressible fluid matter such as air with deep water high pressure so as to store the energy in the compressed air having a smaller compressed volume. The compressed air is subsequently injected into an expansion chamber in which it releases the stored energy and returns to its original volume. In constant temperature, a 10 m3 volume of water provides 10 times pressure to compress a single volume to 1/10 its volume. When the pressure is reduced 10 times, the compressed air would return to its original volume to release the stored energy which can be utilized to rotate a turbine and in turn a power generator to generate electric power.

Abstract: The present invention, called a sludge rotary motor, pertains to an apparatus for generating power which generally comprises a wheel assembly including a wheel, an axle, a ring gear, and a plurality of paddles extending outwardly from the wheel. A housing is provided to deliver a liquid-based material from a storage tank to the paddles, and the housing includes an arcuate portion and an inlet portion. The arcuate portion is positioned around an arcuate segment of the wheel and includes a substantially tubular curved inner surface, and the paddles pass through the arcuate portion. A liquid-based material is stored in an elevated storage tank to increase the weight of the liquid and delivered to the arcuate portion of the housing, thereby forcing the paddles downward and rotating the wheel assembly, which in turn can be used to drive a generator.

Abstract: A hydraulic electricity generator has a drive device, a hydro-generator and a recovering tank. The drive device has at least one compressing unit, and each compressing unit has a storage tube and a compressor. The storage tube has a chamber, an inlet pipe, an outlet pipe and a nozzle. The pipes are connected to the storage tube. The compressor is connected to the storage tube. The hydro-generator is connected to the at least one compressing unit and has a casing, a hydraulic turbine, a windmill and a draining pipe. The hydraulic turbine is rotatably mounted in the casing and has a spindle and multiple blades. The spindle has an outer end extended out of the casing. The windmill is mounted on the outer end of the spindle. The recovering tank is connected to the draining pipe of the hydro-generator and the inlet pipe of the drive device.

Abstract: The invention pertains to a device and method for generation of electrical power from sea waves, with either simultaneous or no desalination of seawater. The device comprises a seaborne portion and a shore-side portion. The seaborne portion of the device comprises a float, an anchor and a pumping mechanism. Seawater and air are drawn in and pumped through pipes and respectively to a shore-side compressor system. The compressor system is adapted to provide pressurized water of constant pressure to the next stage, which is either the desalination assembly through which potable water is produced using the reverse-osmosis method or the water-motor, which drives a generator that provides electrical power or both.

Abstract: An energy conversion system, including a wave chamber, and a turbine wheel coupled to a shaft and fluidly coupled with the wave chamber. The energy conversion system may also include a first radial flow passage fluidly coupled with the wave chamber and the turbine wheel, and first vanes disposed at least partially in the first radial flow passage, each of the first vanes being compliantly mounted and pivotal between first and second positions, the first vanes being configured to allow a motive fluid to flow in a first radial direction through the first radial flow passage when the first vanes are in the first position, and the first vanes being configured to substantially prevent the motive fluid from flowing through the first radial flow passage in a second radial direction when the second vanes are in the second position.

Abstract: Systems and methods for operating a hydraulically actuated device/system are described herein. For example, systems and methods for the compression and/or expansion of gas can include at least one pressure vessel defining an interior region for retaining at least one of a volume of liquid or a volume of gas and an actuator coupled to and in fluid communication with the pressure vessel. The actuator can have a first mode of operation in which a volume of liquid disposed within the pressure vessel is moved to compress and move gas out of the pressure vessel. The actuator can have a second mode of operation in which a volume of liquid disposed within the pressure vessel is moved by an expanding gas entering the pressure vessel. The system can further include a heat transfer device configured to transfer heat to or from the at least one of a volume of liquid or a volume of gas retained by the pressure vessel.

Abstract: A power generating apparatus of renewable energy includes a tower, a nacelle provided at the tower, a main shaft housed in the nacelle and rotating with a blade, a hydraulic pump housed in the nacelle and connected to the main shaft, a hydraulic motor driven by operating oil supplied from the hydraulic pump, a generator connected to the hydraulic motor, and a piping between the hydraulic pump and the hydraulic motor. The hydraulic motor is housed in at least one of the nacelle and the end part of the tower, the generator is housed in at least one of the nacelle and the end part of the tower, and at least one of the hydraulic motor and the generator is arranged in a space excluding an area between the main shaft and the hydraulic pump; and a rear end wall surface of a wall of the nacelle.

Abstract: An ocean tide energy conversion system is disclosed which uses incoming and outgoing tidal flows into a flume with a power wheel and power increaser to furnish power to a turbine pump to lift ocean water into an elevated holding reservoir. Electrical energy is produced when the water in the reservoir flows through a penstock to operate a generator before it is returned to the ocean. This system is completely operated by tidal flows.

Abstract: The present invention refers to a underwater unit (1) for a hydroelectric power plant and a modular hydroelectric power plant (2) comprising a plurality of such units. The unit (1) according to the invention uses the principle of functioning of the traditional hydroelectric power plants and comprises a penstock (200) which involves a “head” of at least 100 m, and preferably of about 150-300 m, and carries elevated kinetic energy water masses from the surface of a water basin down to one or more turbines (301a-301f) provided in depth under the surface of the basin itself, so as to transfer the kinetic energy from the water to said turbines and to transform then the kinetic energy into electric power. Thanks to the use of variable volume discharge tanks (313a,313b) positioned downstream the turbines, it is possible to easily and effectively return the water masses used for the actuation of turbines themselves to the surrounding environment.

Abstract: The water powered hydraulic ram, when housed in a supporting water-tight structure deep within a moving body of water, functions essentially as a four cycle engine with water as it prime mover. It is a linear motor, just as if it were powered by ordinary fossil-based fuels. It harnesses the force of moving water and the pressure of water at a depth and becomes a prime mover whose output is hydro-power. The component parts of this linear motor are a hydraulic ram cylinder, sliding ram pistons, a venturi/eductor jet pump, electronic piston positioning sensors, solenoid controlled valves and process program software. It is positioned to face an oncoming, irresistible downstream water force. It may be either singular or in plurality as an array. The ideal application is for a reverse osmosis membrane to remove the salt from seawater providing unlimited quantities of potable, fresh drinking water.

Abstract: A wave energy conversion apparatus comprises:-a mechanical element arranged in operation to move repeatedly in a cycle in response to wave motion, wherein the speed of the mechanical element varies between a maximum and a minimum during each cycle; power extraction means arranged to extract energy from the movement of the mechanical element; and movement assistance means arranged to assist the movement, in response to the wave motion, of the mechanical element, during at least one part of the cycle during which the speed of movement of the mechanical element is substantially equal to the minimum for that cycle, wherein the power extraction means comprises a fluid pressurisation system that is arranged so that in operation fluid in the fluid pressurisation system is pressurised in response to movement of the mechanical element, the fluid pressurisation system comprises a one-way valve for transferring pressurised fluid from the fluid pressurisation system and the movement assistance means is located upstream o

Abstract: A system includes a collection of water at a first elevation, an aquifer at a second elevation lower than the first elevation and one or more fluid communication channels that facilitate fluid communication between the collection of water and the aquifer. A turbine-generator is in one of the fluid communication channels to convert kinetic energy of fluid that has flown out of the collection of water into electrical energy. A fluid collection area is downstream of the turbine-generator that at least temporarily collects fluid that has passed through the turbine-generator. An injection pump is provided to pump fluid that has accumulated in the collection area into the aquifer.

Abstract: A wave responsive electrical generator device having a buoyant member connected to an anchor by a tether line member, the line member passing through a sheave mounted within the buoyant member and descending to a counterweight, whereby vertical motion of the buoyant member results in rotation of the sheave, which in turn operates hydraulic cylinders to deliver hydraulic fluid under pressure to an hydraulic motor, which drives an electrical generator.

Abstract: Systems and methods for using instream water flow velocity to increase hydro turbine output is provided. In one implementation, the system and method are adapted to harness the kinetic energy in flowing water, preferably in waste water spilling over low-head dams or flowing from pump discharge at reservoir pumping stations, and using such energy in conjunction with differentials between head water and turbine location to improve turbine output. In certain implementations, the novel technology can be used to establish dispersed small-scale hydroelectric generation units at existing low-head dams. Preferably, the dispersed small-scale hydroelectric generation units can be connected to the existing power grid, thus providing a new source of sustainable alternative energy.

Abstract: The flow of fluid into energy capture machines is crucial for determining the amount of energy extracted, particularly in the field of renewable energy resources. The current invention describes devices and methods for applying the physics of flow to energy capture machines, most commonly wind and water turbines, by enhancing the flow into the energy capture component by the appropriate placement of various objects called flow deflection devices (FDD). FDDs can make a highly significant improvement in power output.

Abstract: A wave energy electric power generation system has a buoyant body responsive to wave movement and an associated, relatively vertically stationary body, a compressor, a pressure regulator, and an impulse air turbine/generator set. The compressor has a piston that moves reciprocally relative to a cylinder to alternately compress air in opposed chambers. A pressure regulator tank defines a chamber in communication with the compressor for alternately receiving compressed air from opposed compression chambers, a floating piston within the tank applying pressure to compressed air in the chamber, a pressure regulator controlling pressure applied by the piston to the compressed air, and an hydraulic dampening system coupled to the floating piston to restrict unwanted vertical oscillations of the piston, for output of a continuous flow of compressed air at relatively constant pressure.

Abstract: A bidirectional axial flow turbine with self-pivoting blades is provided for use in a central opening of submerged horizontally-aligned structure forming a wave energy conversion device. Entry and exit inner guide vanes are positioned on opposite sides of the vertically-aligned central opening, for directing the bidirectional fluid flow into and out of the central opening and inducing a vortex swirl in both directions of fluid flow that has the same direction of rotation. Within the opening, a turbine hub is mounted with a plurality of uniformly spaced self-pivoting blades that have a symmetrical blade profile to the bidirectional flow. The self-pivoting blades automatically change their blade angle in response to the force of water flow on the blades, so that they turn the turbine shaft in the same rotational direction in both flow directions.

Abstract: A compressed-air wind turbine generator system is provided. The system includes a wind turbine, a plurality of compressors for providing compressed air to the wind turbine, a left sail, a right sail, and a rear sail. The center shaft of the wind turbine is connected to the input shaft of a generator set. The plurality of compressors, the left sail, the right sail, and the rear sail are integrally assembled so that they rotate together under the action of the sails within a range of 360 degrees relative to the wind turbine and so that the air inlet surfaces of the compressor always face maximum wind. The system has advantages of low cost, high wind energy utilizing efficiency, large installation capacity, and long service lifetime.

Abstract: A power generating apparatus includes a rotating shaft, a hydraulic pump driven by the rotating shaft, a hydraulic motor driven by operating oil supplied from the hydraulic pump; and a generator coupled to the hydraulic motor. The apparatus further includes an oil line connected to the hydraulic pump and the hydraulic motor for circulating the operating oil between the hydraulic pump and the hydraulic motor, an oil cooler connected to the oil line for cooling the operating oil by heat exchange with a cooling medium, a cooling-medium line supplying the cooling medium to the oil cooler; a bypass line diverging from at least one of the oil line and the cooling-medium line and merging into at least one of the oil line and the cooling-medium line to bypass the oil cooler; and a flow regulating valve in at least one of the oil line and the cooling-medium line.

Abstract: It is intended to provide a power generating apparatus of renewable energy type that has a fixation structure of the hydraulic pump that can transmit large torque and can be processed with ease and at low cost even when the main shaft has a large diameter, as well as a method of installing such hydraulic pump. In the power generating apparatus, a connecting member 20 is provided on the outer periphery of a main shaft 4 to engage with a cylindrical member 10 provided on the outer periphery of the main shaft 4. The connecting member 20 includes a fixing part 21, a first spline part 22 and first pins 23. The fixing part 21 is fixed to the outer periphery of the main shaft 4 by means of the first pins 23 disposed along a circumferential direction of the main shaft 4.

Abstract: In an energy extraction device and method for extracting energy from a fluctuating energy flow from a renewable energy source, a hydraulic pump is driven by a rotating shaft, driven in turn by a renewable energy source. A hydraulic motor drives a load and a high pressure manifold communicates between the pump, motor and an elastically deformable fluid retaining body. The hydraulic pump and hydraulic motor comprise working chambers displacing a volume of working fluid selectable on each cycle of working chamber volume by the control of electronic valves. The pressure in the high pressure manifold is measured and the net rate of displacement of working fluid by the hydraulic pump is selected responsive thereto to regulate the torque applied to the said rotating shaft.

Abstract: The present technology is directed generally to pneumatic gearbox systems with variable speed transmission and associated systems and methods. In selected embodiments, pneumatic gearbox systems can include a variable input power source and a compressor operatively coupled thereto. The compressor can be configured to compress a fluid at a first cyclic frequency from the variable power input power source. The system can further include a storage vessel in fluid communication with the compressor and an expander in fluid communication with the storage vessel. The storage vessel can be configured to retain a volume of the fluid after compression until the expander draws upon it to expand the fluid at a second cyclic frequency different from the first cyclic frequency. The second cyclic frequency can be configured to synchronize with that of an electrical generator.

Abstract: An object of the invention is to provide a wind turbine generator or a tidal current generator which is equipped with a hydraulic transmission and achieves a superior power generation efficiency, and a operation method thereof. The wind turbine generator 1 comprises a hydraulic pump 12 of a variable displacement type which is rotated by the main shaft 8, a hydraulic motor 14 of a variable displacement type which is connected to the generator 20, and a high pressure oil line 16 and a low pressure oil line 18 which are arranged between the hydraulic pump 12 and the hydraulic motor 14. The pump controller 32 obtains a target torque of the hydraulic pump 12 at which a power coefficient becomes maximum, and then sets a displacement Dp of the hydraulic pump 12 based on the target torque and the pressure in the high pressure oil line 16.

Abstract: A method of operating and a pump storage arrangement are disclosed. The arrangement includes a main flow machine arranged between an energy store and an energy sink such that a fluid medium is conveyed out of the energy sink through the main flow machine into the energy store during pump operation while converting electrical energy into kinetic flow energy. The fluid medium is conveyed out of the energy store through the flow machine back into the energy sink during turbine operation while converting the stored potential energy into electrical energy. An auxiliary flow machine is arranged in series with the main flow machine and a conversion means is provided such that the fluid medium is conveyable through the main flow machine and the auxiliary flow machine during pump operation and the fluid medium is only conveyable through the main flow machine during turbine operation.

Abstract: Provided is a wind powered system for reducing energy consumption of a power source, such as an internal combustion engine or an electric motor. In one embodiment, the wind powered system comprises a wind turbine operatively connected to an internal combustion engine, for example via a direct mechanical connection, a hydrostatic drive system or a pneumatic drive system in order to reduce the amount of fuel required by the engine to operate an electricity generating means. A controller may be optionally provided to modulate the load on the wind turbine in order to maximize the extraction of available power according to local wind conditions. In another embodiment, the wind turbine is connected to an air compressor for providing a supply of air in order to offset energy consumption of a conventional compressed air system.

Abstract: Ancient Hydroelectric Company comprises a portable hydroelectricity producing system. Consumers are provided with a cost-effective and reliable system for providing substantially clean electricity generation without obstructing the water source or negatively affecting the environment. The high efficiency portable hydro-electric producing system is for use with a moving water source. The system uses antifreeze with water to provide a more thermally efficient working fluid as used to improve the system's pressure and volume capacity in use.

Abstract: The present invention provides a potential energy regenerating system and method and an electricity regenerating system and method. The potential energy regenerating system comprises: a liquid storage bag module, having a compressible liquid storage bag; a pipe line module, including a liquid access opening switch control device and a pipe line connected to the liquid access opening control device; a liquid storage tank module, including a liquid storage tank with a bottom higher than the highest position where the liquid storage bag module can reach; and a squeezing weight module, including a squeezing weight mass and a control device, wherein the squeezing weight mass is placed on a top of the compressible liquid storage bag, and the control device controls to lift and release the squeezing weight mass. The electricity regenerating system uses the foregoing potential energy regenerating system to generate electricity.

Abstract: It is intended to provide a power generating apparatus of renewable energy type that has a fixation structure of the hydraulic pump that can transmit large torque and can be processed with ease and at low cost even when the main shaft has a large diameter, as well as a method of installing such hydraulic pump. In the power generating apparatus, a connecting member 20 is provided on the outer periphery of a main shaft 4 to engage with a cylindrical member 10 provided on the outer periphery of the main shaft 4. The connecting member 20 includes a fixing part 21, a first spline part 22 and first pins 23. The fixing part 21 is fixed to the outer periphery of the main shaft 4 by means of the first pins 23 disposed along a circumferential direction of the main shaft 4.

Abstract: In various embodiments, energy storage and recovery features energy conversion to and from gravitational potential energy.

Abstract: A wave energy converter has a shell, a pendulum pivotally positioned in the shell, a magnet thereon, a variable inductor positioned in the shell, a pendulum adjustor for changing a center of gravity of the pendulum, a motion sensor positioned in the shell, a position sensor connected to the pendulum, a rotation sensor connected to the pendulum, and a controller connected to the motion sensor and the position sensor and the rotation sensor. The pendulum has a magnet thereon. The magnet of the pendulum oscillates adjacent the variable inductor. The variable inductor can adjust the inductive capacity.

Abstract: For reducing the number of anchors required for mooring a plurality of WECs in a body of water, the WECs are arrayed in two patterns enabling the sharing of anchors among the WECs. One pattern comprises pluralities of WECs disposed in polygonal shaped cells with an anchor disposed beneath each cell connected to all the WECs in the cell. A second pattern comprises a tessellated pattern of contiguous cells with WECs at the interface between contiguous pairs of cells being common to both cells of the pairs.

Abstract: A plant for producing electrical power from the movement of waves. An offshore dam has a fixed generally vertical surface which is located in open water having wave movement and located vertically at the water surface. A submerged part which is fixed relative to the dam has an opening below the waves and in close proximity to the plane of the vertical surface to receive sea water. A force exerting structure such as a hydraulic pump or a thrust arrangement receives the water through the opening and forces that water through a one-way valve beyond which it is led to a turbine for producing electric power.

Abstract: A compressed-air energy storage system according to embodiments of the present invention comprises a reversible mechanism to compress and expand air, one or more compressed air storage tanks, a control system, one or more heat exchangers, and, in certain embodiments of the invention, a motor-generator. The reversible air compressor-expander uses mechanical power to compress air (when it is acting as a compressor) and converts the energy stored in compressed air to mechanical power (when it is acting as an expander). In certain embodiments, the compressor-expander comprises one or more stages, each stage consisting of pressure vessel (the “pressure cell”) partially filled with water or other liquid. In some embodiments, the pressure vessel communicates with one or more cylinder devices to exchange air and liquid with the cylinder chamber(s) thereof. Suitable valving allows air to enter and leave the pressure cell and cylinder device, if present, under electronic control.

Abstract: Systems for circulation a fluid through a system and substituent component systems of the same. In one example, a pressure input system includes a bladder support, an expelling element, and a roll-up bladder configured to spool about the expelling element. The bladder support can rotate about an axis of rotation between at least a first configuration and a second configuration. The bladder support can include a first end and a second end opposite the first end. A distance between the first end and a ground surface when the bladder support is in the first configuration can be greater than a distance between the second end and the ground surface and a distance between the first end and the ground surface when the bladder support is in the second configuration can be less than a distance between the second end and the ground surface.