GB2459112A - Control for hydraulic system of wave energy device - Google Patents

Control for hydraulic system of wave energy device Download PDF

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Publication number
GB2459112A
GB2459112A GB0806487A GB0806487A GB2459112A GB 2459112 A GB2459112 A GB 2459112A GB 0806487 A GB0806487 A GB 0806487A GB 0806487 A GB0806487 A GB 0806487A GB 2459112 A GB2459112 A GB 2459112A
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United Kingdom
Prior art keywords
primary circuit
fluid
pressure
power take
flow rate
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Granted
Application number
GB0806487A
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GB2459112B (en
GB0806487D0 (en
Inventor
Vladimir Kalinin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wavebob Ltd
Original Assignee
Wavebob Ltd
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Filing date
Publication date
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Priority to GB0806487A priority Critical patent/GB2459112B/en
Publication of GB0806487D0 publication Critical patent/GB0806487D0/en
Publication of GB2459112A publication Critical patent/GB2459112A/en
Application granted granted Critical
Publication of GB2459112B publication Critical patent/GB2459112B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
    • F03B13/12—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy
    • F03B13/14—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy
    • F03B13/16—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem"
    • F03B13/20—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem" wherein both members, i.e. wom and rem are movable relative to the sea bed or shore
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
    • F03B13/12—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy
    • F03B13/14—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy
    • F03B13/16—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem"
    • F03B13/18—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem" where the other member, i.e. rem is fixed, at least at one point, with respect to the sea bed or shore
    • F03B13/1845—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem" where the other member, i.e. rem is fixed, at least at one point, with respect to the sea bed or shore and the wom slides relative to the rem
    • F03B13/187—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem" where the other member, i.e. rem is fixed, at least at one point, with respect to the sea bed or shore and the wom slides relative to the rem and the wom directly actuates the piston of a pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B15/00—Controlling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/40—Transmission of power
    • F05B2260/406—Transmission of power through hydraulic systems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/30—Energy from the sea, e.g. using wave energy or salinity gradient

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)

Abstract

A power take off system 100 comprises a hydraulically driven power generator 121 for generating electrical energy. A pump 120 is driven by wave energy for pumping the hydraulic fluid. The pump 120 and power generator 121 are in fluid communication via primary hydraulic circuit 125. A sensing unit 140 senses hydraulic pressure and flow rate in the primary circuit, and controls a valve 150 and pressure control unit 145 to vary the pressure in the primary circuit 125 so that there is a linear relationship between the flow rate and the pressure of the hydraulic fluid 125.

Description

A power take off system for harnessing wave energy.
Field of the Invention
The present invention relates to a power take off system for harnessing wave energy. In particular the present invention relates to a power take off system which includes a pressure controller for varying the pressure within a hydraulic circuit that may be usefully employed within a wave energy convertor.
Background
Wave energy convertors are known in the art. Examples of such arrangements include those described in our earlier patents EP1439306, EP1295031 and EP1 036274. Such arrangements are usefully deployed in a maritime environment and generate energy from wave motion.
To provide such generation it is known for such convertors to employ power take off systems. Typically such systems comprise a hydraulic circuit which is powered by the wave energy which in turn drives a power generator to generate electricity. The hydraulic circuit is controlled such that it remains at a constant pressure irrespective of the quantity of wave energy available so that the electrical power generated by the generator is of a stable frequency. By generating power at a stable frequency permits the power to be readily used in a power grid. The main disadvantage of providing a constant pressure hydraulic circuit is that all the available wave energy is not maxim ised.
There is therefore a need for a system which maximises wave energy for generating electricity.
Sum mary These and other problems are addressed by providing a power take off system which includes a pressure controller which is operable for varying the pressure within a hydraulic circuit.
Accordingly, a first embodiment of the invention provides a system as detailed in claim 1. Advantageous embodiments are provided in the dependent claims.
These and other features will be better understood with reference to the followings Figures which are provided to assist in an understanding of the teaching of the invention.
Brief Description Of The Drawings
The present invention will now be described with reference to the accompanying drawings in which: Figure 1 is a diagrammatic view of a power take off system in accordance with the present invention.
Figure 2 is a wave energy conversion system which drives the power take off system of Figure 1.
Detailed Description Of The Drawings
The invention will now be described with reference to an exemplary system thereof which is provided to assist in an understanding of the teaching of the invention.
Referring to Figure 1 there is illustrated a power take off system 100 for obtaining electrical power from a wave energy conversion system. Wave energy conversion systems are known in the art, an example of which is shown in our earlier patent EP 1295031 and replicated in Figure 2 of the instant application.
This exemplary wave energy conversion system or apparatus 105 comprises at least two devices 110, 111. Each of the two devices comprises a surface float and/or at least one submerged body below the surface of the body of liquid.
Linkages are provided between the at least two devices. By configuring each of the two devices to oscillate at different frequencies relative to one another in response to passing waves, the at least two devices move relative to one another in response to passing waves. This relative movement between the at least two devices effects an energy transfer which may be harnessed by the linkages between the at least two devices. The linkages may be coupled to a power take off system that harnesses the energy generated by the wave energy conversion system 105 and converts the energy into electrical energy.
While the convertor of EP 1295031 is described as employing a power take off system -an example of which is described in Figure 7 of EP 1295031, such a system utilises a hydraulic circuit that is controlled such that it remains at a constant pressure irrespective of the quantity of wave energy. The present inventors have realised that such an arrangement does not optimise the power take off with respect to the available wave energy. In contrast, the power take off system 100 of Figure 1 of the instant application is specifically configured to maximise the available power take off. Such a system 100 comprises at least one hydraulic pump 120 which is driven by a wave energy convertor such as the convertor 105. The hydraulic pump operably pumps hydraulic fluid from a reservoir (not shown) to a power generator 121. The pump 120 is in fluid communication with the power generator 121 via a primary hydraulic circuit 125.
The fluid pumped by the pump 120 to the power generator 121 causes a turbine (not shown) in the power generator 121 to rotate thereby generating electricity.
The hydraulic pump 120 comprises a hydraulic cylinder 122 and a piston 124 operably coupled to the float 110 of the wave energy conversion system via a coupling shaft 126. Thus, as the submerged body 115 reciprocates it causes the piston 124 in the hydraulic cylinder 122 also to reciprocate. The reciprocating movement of the piston 124 within the cylinder 122 forces hydraulic fluid from the reservoir (not shown) into the primary circuit 125 under pressure. Hydraulic pumps are well known in the art and it is not the intention to describe them further.
The power generator 121 comprises a secondary circuit 130 which is in fluid communication with the primary circuit 125 through a unidirectional pneumatic valve 133. A flow control means, namely, a rotatable swash plate is located in the secondary circuit 130 for controlling the flow rate of the fluid in the secondary circuit 130, which in turn controls the flow rate of the fluid in the primary circuit 125. The swash plate 135 provides resistance to the flow of fluid in the secondary circuit 130. The angular position of the swash plate 135 determines the level of resistance to the flowing fluid. This angle of the swash plate 135 is chosen based on the characteristics of the wave regime where the wave energy conversion system 105 is operating. The swash plate 135 remains stationary once its angular position is selected. The angle of the swash plate 138 is determined by a controlling function: F= pII-f Where: F is the control function for determining the angle of the swash plate; p is the pressure of the fluid in the primary circuit; I is the flow rate of the fluid in the primary circuit; and is a predetermined constant associated with the characteristics of a predetermined wave regime.
A sensing unit 140 located intermediate the hydraulic pump 120 and the power generator 121 in the primary circuit 125 is operable for reading characteristics of the fluid as it is pumped through the primary circuit 125. In this exemplary embodiment, the sensing unit 140 generates a first signal representative of the pressure of the fluid in the primary circuit 125, and a second signal representative of the flow rate of the fluid in the primary circuit 125.
A pressure control unit 145 is operably coupled to the primary circuit 125 for controlling the pressure of the fluid within the primary circuit 125. The pressure control unit 145 comprises a third circuit 148 which is in fluid communication with the primary circuit 125 through a connecting means, in this case, a bi-directional pneumatic valve 150. It will be appreciated that wave energy varies significantly depending on the conditions in the ocean. In periods of large swells the wave energy conversion system 105 generates a large amount kinetic energy which drives the pump 120 at a high rate so that the fluid in the primary circuit 125 is under high pressure. While in periods of relatively small swells the kinetic energy generated by the wave energy conversion system 105 is significantly less than periods of large swells resulting in less kinetic energy and as consequence the pump 120 is driven at a slower rate resulting in the fluid in the primary circuit 125 being under less pressure. The pressure control unit 145 regulates the pressure within the primary circuit 125 to optimise the kinetic energy generated by the waves. In order to maximise the wave energy the pressure control unit 145 varies the pressure in the primary circuit 125 for maintaining a linear relationship between the flow rate I and pressure P in the primary circuit 125 so that: P=fI The pressure control unit 145 comprises a housing 153 defining a hollow interior region 155. A first piston 160 which is axially moveable within the housing 153 divides the hollow interior region 155 into an oil accommodating chamber 162 for storing oil, and a compression chamber 164 for accommodating a compressed medium, typically gas. The oil accommodating chamber 162 is in fluid communication with the primary circuit 125 via the third circuit 148. The volume of the compression chamber 164 is the volume between the first piston 160 and an axially spaced apart adjusting means, namely, secondary piston 170 which is also axially moveable within the housing 153.
The volume of the oil accommodating chamber 162 is the volume between the first piston 160 and an inlet/outlet port 172 of the housing 153.
A controller 175 of the pressure control unit 145 is in communication with the sensing unit 140 for reading the first and second signals. The controller 175 is operable to move the secondary piston 170 in response to reading the first and second signals generated by the sensing unit 140. If the secondary piston is urged towards the inlet/outlet port of the housing 172 it causes the first piston 160 to also move towards the inlet/outlet port 172 of the housing 172 thereby reducing the volume of the oil accommodating chamber 162. Similarly, if the secondary piston 170 is urged away from the inlet/outlet port of the housing 172 it causes the first piston 160 to also move away from inlet/outlet port 172 of the housing 172 thereby increasing the volume of the oil accommodating chamber 162. It will be appreciated by those skilled in the art that by varying the volume of the oil accommodating chamber 162 that the pressure of the oil in the primary circuit 125 is also varied. The pressure control unit 145 operates as a pressure accumulator which stores pressure in periods of high wave energy. The accumulated pressure in the pressure control unit 145 is released to the primary circuit 125 in periods of low wave energy. The controller 175 is programmed to regulate the pressure in the primary circuit 125 so that there is a linear relationship between the flow rate I and the pressure P of the fluid in the primary circuit 125. While a preferred arrangement for a pressure control unit has been described it will be understood that a standard pressure accumulator of the type well known in the art may be used for varying the pressure in the primary circuit. However, it will be appreciated that a standard pressure accumulator will not be as effective as the pressure control unit 145. It is not intended to limit the teaching of the present invention to a specific type of pressure control unit.
In operation, the angle of the swash plate 135 is selected for optimum power generation based on the characteristic of the wave regime where the wave energy conversion system 105 is moored. The wave energy conversion system 105 generates kinetic energy from wave energy which is then harnessed by the hydraulic pump 120. The wave energy causes the piston 124 to reciprocate in the hydraulic cylinder 122 resulting in hydraulic fluid being pumped from a reservoir (not shown) to the primary circuit 125. The power generator 121 generates electricity in response to receiving the pumped fluid. In periods of high wave energy the pump 120 is driven at a corresponding high rate resulting in high pressure in the primary circuit 125. The swash plate 135 restricts the flow of the fluid in the secondary circuit 130 received from the primary circuit 125. If the pressure within the primary circuit exceeds a threshold level determined by the angle of the swash plate 135 some of the fluid from the primary circuit 125 is forced into the oil accommodating chamber 162 via the third circuit 148 as the secondary circuit 130 is unable to receive all the fluid from the primary circuit 125 due to the flow resistance caused by the swash plate 135. In this scenario, the pressure control unit 145 operates as oil pressure accumulator as pressurised oil is stored in the oil accommodating chamber 162.
In periods of low wave energy the pump 120 is driven at a corresponding lower rate resulting in low pressure in the primary circuit 125. In this scenario the secondary circuit 130 is not operating at full capacity due to the reduced pressure. However, the pressurized oil within the oil accommodating chamber 162 can now flow from the oil accommodating chamber 162 via the third circuit 166 into the primary circuit 125 which increases the pressure in the primary circuit 125, which in turn increases the pressure within the secondary circuit 130. Thus, the pressure control unit 145 regulates the pressure within the primary circuit 125.
The sensing unit 140 monitors the primary circuit 125 and generates the first signal representative of the pressure within the primary circuit 125, and the second signal representative of the flow rate within the primary circuit 125. The controller 175 of the pressure control unit 145 reads the first and second signals. The controller 175 axially moves the secondary piston 170 in response to reading the first and second signals which in turn axially moves the first piston 160 for varying the volume of the oil accommodating chamber 162. The controller 175 varies the volume of the oil accommodating chamber 162 thereby varying the pressure within the primary circuit 125. The controller 175 varies the volume of the oil accommodating chamber 162 which ensures that there is a linear relationship between the flow rate I and the pressure P of the fluid in the primary circuit 125.
It will be understood that what has been described herein is an exemplary embodiment of a power take off system. While the present invention has been described with reference to exemplary arrangements it will be understood that it is not intended to limit the teaching of the present invention to such arrangements as modifications can be made without departing from the spirit and scope of the present invention. For example, instead of providing a second piston 170 a combination of springs could be provided as means for actuating the first piston 160. In this way it will be understood that the invention is to be limited only insofar as is deemed necessary in the light of the appended claims.
The words comprises/comprising when used in this specification are to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps, components or groups thereof.

Claims (11)

  1. Claims 1. A power take off system for harnessing wave energy, the system comprising: a power generator being driven by fluid for generating electrical energy, at least one pump being driven by wave energy for pumping fluid to the power generator, a primary circuit arranged so that the pump and the power generator are in fluid communication, a sensing unit for sensing at least one characteristic of the fluid in the primary circuit, and a pressure control unit being operably coupled to the primary circuit and being responsive to the sensing unit for varying the pressure of the fluid in the primary circuit so that there is a linear relationship between the flow rate and the pressure of the fluid in the primary circuit.
  2. 2. A power take off system as claimed in claim 1, wherein the sensing unit is operable for sensing pressure of the fluid in the primary circuit and generating a first signal representative thereof.
  3. 3. A power take off system as claimed in claim 2, wherein the sensing unit is operable for sensing the flow rate of the fluid in the primary circuit and generating a second signal representative thereof.
  4. 4. A power take off system as claimed in claim 3, wherein the pressure control unit is operable for reading the first and second signals.
  5. 5. A power take off system as claimed in any preceding claim, wherein the pressure control unit regulates the pressure of the fluid in the primary circuit such that pressure of the fluid in the primary circuit is a constant times the flow rate of the fluid in the primary circuit.
  6. 6. A power take off system as claimed in any preceding claim, wherein the pressure control unit comprises: a housing defining an oil accommodating chamber in fluid communication with the primary circuit, and an adjusting means for adjusting the volume of the oil accommodating chamber.
  7. 7. A power take off system as claimed in claim 6, wherein the pressure control unit further comprises a connecting means for connecting the oil accommodating chamber with the primary circuit such that the oil accommodating chamber is in fluid communication with the primary circuit.
  8. 8. A power take off system as claimed in any preceding claim, wherein a flow rate control means is provided for controlling the flow rate of the fluid to the power generator.
  9. 9. A power take off system as claimed in claim 8, wherein the flow rate control means comprises a rotatable plate.
  10. 10. A power take off system as claimed in claim 9, wherein the angle of the plate is determined by the characteristics of the waves used to drive the pump.
  11. 11. A power take off system substantially as hereinbefore described with reference to the accompanying Figures.
GB0806487A 2008-04-10 2008-04-10 A power take off system for harnessing wave energy Expired - Fee Related GB2459112B (en)

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Application Number Priority Date Filing Date Title
GB0806487A GB2459112B (en) 2008-04-10 2008-04-10 A power take off system for harnessing wave energy

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GB0806487A GB2459112B (en) 2008-04-10 2008-04-10 A power take off system for harnessing wave energy

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GB0806487D0 GB0806487D0 (en) 2008-05-14
GB2459112A true GB2459112A (en) 2009-10-14
GB2459112B GB2459112B (en) 2010-04-07

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2491026A (en) * 2011-05-16 2012-11-21 Bosch Gmbh Robert Pressure of hydraulic flow from wave energy converters is proportional to flow rate
WO2014052004A1 (en) * 2012-09-28 2014-04-03 Murtech, Inc. Articulated-raft/rotary-vane pump generator system
US8778176B2 (en) 2012-07-05 2014-07-15 Murtech, Inc. Modular sand filtration—anchor system and wave energy water desalination system incorporating the same
US8784653B2 (en) 2012-07-05 2014-07-22 Murtech, Inc. Modular sand filtration-anchor system and wave energy water desalinization system incorporating the same
WO2015149806A1 (en) * 2014-04-03 2015-10-08 Faatek Aps System for pumping a fluid in response to natural wave action on a body of water
US9334860B2 (en) 2014-07-11 2016-05-10 Murtech, Inc. Remotely reconfigurable high pressure fluid passive control system for controlling bi-directional piston pumps as active sources of high pressure fluid, as inactive rigid structural members or as isolated free motion devices
US9702334B2 (en) 2015-03-16 2017-07-11 Murtech, Inc. Hinge system for an articulated wave energy conversion system
US10155678B2 (en) 2012-07-05 2018-12-18 Murtech, Inc. Damping plate sand filtration system and wave energy water desalination system and methods of using potable water produced by wave energy desalination
US10359023B2 (en) 2017-01-18 2019-07-23 Murtech, Inc. Articulating wave energy conversion system using a compound lever-arm barge

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2641399C (en) * 2006-02-27 2015-11-24 Basf Se Use of polynuclear phenolic compounds as stabilisers

Citations (3)

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Publication number Priority date Publication date Assignee Title
WO1995010706A1 (en) * 1993-10-13 1995-04-20 Friedman, Mark, M. System for conversion of sea wave energy
JP2002142498A (en) * 2000-11-01 2002-05-17 Tomiji Watabe Controller of pendulum type wave power generator
EP1295031A1 (en) * 2000-06-16 2003-03-26 Wavebob Limited Wave energy converter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995010706A1 (en) * 1993-10-13 1995-04-20 Friedman, Mark, M. System for conversion of sea wave energy
EP1295031A1 (en) * 2000-06-16 2003-03-26 Wavebob Limited Wave energy converter
JP2002142498A (en) * 2000-11-01 2002-05-17 Tomiji Watabe Controller of pendulum type wave power generator

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2491026A (en) * 2011-05-16 2012-11-21 Bosch Gmbh Robert Pressure of hydraulic flow from wave energy converters is proportional to flow rate
US10029927B2 (en) 2012-07-05 2018-07-24 Murtech, Inc. Modular sand filtration-anchor system and wave energy water desalination system and methods of using potable water produced by wave energy desalination
US10766793B2 (en) 2012-07-05 2020-09-08 Murtech, Inc. Damping plate sand filtration system and wave energy water desalination system and methods of using potable water produced by wave energy desalination
US8778176B2 (en) 2012-07-05 2014-07-15 Murtech, Inc. Modular sand filtration—anchor system and wave energy water desalination system incorporating the same
US8784653B2 (en) 2012-07-05 2014-07-22 Murtech, Inc. Modular sand filtration-anchor system and wave energy water desalinization system incorporating the same
US10155678B2 (en) 2012-07-05 2018-12-18 Murtech, Inc. Damping plate sand filtration system and wave energy water desalination system and methods of using potable water produced by wave energy desalination
US8866321B2 (en) 2012-09-28 2014-10-21 Murtech, Inc. Articulated-raft/rotary-vane pump generator system
AU2013324081B2 (en) * 2012-09-28 2017-05-04 Murtech, Inc. Articulated-raft/rotary-vane pump generator system
AU2013324081B9 (en) * 2012-09-28 2017-05-25 Murtech, Inc. Articulated-raft/rotary-vane pump generator system
WO2014052004A1 (en) * 2012-09-28 2014-04-03 Murtech, Inc. Articulated-raft/rotary-vane pump generator system
WO2015149806A1 (en) * 2014-04-03 2015-10-08 Faatek Aps System for pumping a fluid in response to natural wave action on a body of water
US9587635B2 (en) 2014-07-11 2017-03-07 Murtech, Inc. Remotely reconfigurable high pressure fluid passive control system for controlling bi-directional piston pumps as active sources of high pressure fluid, as inactive rigid structural members or as isolated free motion devices
US9845800B2 (en) 2014-07-11 2017-12-19 Murtech, Inc. Remotely reconfigurable high pressure fluid passive control system for controlling bi-directional piston pumps as active sources of high pressure fluid, as inactive rigid structural members or as isolated free motion devices
US9334860B2 (en) 2014-07-11 2016-05-10 Murtech, Inc. Remotely reconfigurable high pressure fluid passive control system for controlling bi-directional piston pumps as active sources of high pressure fluid, as inactive rigid structural members or as isolated free motion devices
US10030645B2 (en) 2014-07-11 2018-07-24 Murtech, Inc. Remotely reconfigurable high pressure fluid passive control system for controlling bi-directional piston pumps as active sources of high pressure fluid, as inactive rigid structural members or as isolated free motion devices
US9702334B2 (en) 2015-03-16 2017-07-11 Murtech, Inc. Hinge system for an articulated wave energy conversion system
US10508640B2 (en) 2015-03-16 2019-12-17 Murtech, Inc. Hinge system for an articulated wave energy conversion system
US10359023B2 (en) 2017-01-18 2019-07-23 Murtech, Inc. Articulating wave energy conversion system using a compound lever-arm barge

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Publication number Publication date
GB2459112B (en) 2010-04-07
GB0806487D0 (en) 2008-05-14

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