In order to negate the resulting vertical oscillation of the variable buoyancy in the case where it is reacting against a fixed buoyancy on the surface above, the fixed mass 28 may be extended so that its horizontal 20 dimensions with respect to the surface are substantially greater than its vertical dimensions. Research and development into wave energy converters (WECs) over the past twenty-five years, plus the knowledge and practical experience gained from the off-shore 5 oil and gas industries, has now reached a stage where robust and effective wave energy converters with installed capacities of one megawatt and greater are being developed. The volume changes may occur adiabatically or close to adiabatically and are governed by the elementary gas laws.
- Alteraciones radiológicas de intestino delgado
- Además, procura masajearlos un par de minutos cada uno, Luego, enjuaga
- El dolor agudo de rodilla comienza de repente, por ejemplo después de una lesión
- Portugal reabre este sábado las fronteras con España, cerradas desde enero
15 The primary excitation forces arise from the vertical displacement in the waves and corresponding changes in hydrostatic pressures below. The significant feature is that the floating vessel of fixed buoyancy 113 and the submerged variable buoyancy 6 with its counterbalancing mass tend to move in opposite phase as waves pass, thus being in effect a two-body oscillator. WO 95/17555 describes the wave energy transformer in terms of two similar containers, 15 horizontally displaced, such that the gas displaced from one container passes to the second. When a trough passes above it the reverse process occurs, and the vessel tends to rise to recover its rest position. 20 The whole device is suspended from the floating member of fixed buoyancy 113 and the predominant motion is along a vertical axis. 30 WO 99/28623 PCT/IE98/00101 8 Brief Description of the Drawings Figure la is a schematic showing the principle of operation of a single acting device of the present invention, 5 Figure lb is a schematic showing the principle of operation of a double acting device of the present invention, Figure 2a shows the device of Figure 1 a under a flat surface of liquid, Figure 2b shows the device of Figure I a under a crest, such that the head of liquid above is increased, 10 Figure 2c shows the device of Figure l a under a trough, such that the head of liquid above is reduced, Figure 3 shows an arrangement for the device of Figure lb combining a flexible vessel and a counterweight, Figure 4 shows a practical arrangement of the device of Figure 3, 15 Figure 5a shows an alternative embodiment of the device of Figure lb, Figure 5b shows an alternative embodiment of the device of Figure 5a, Figure 5c shows an alternative embodiment of the device of Figure 5a, Figure 6 is a schematic showing the principle of operation of an embodiment of the present invention wherein power is derived from the reaction against a floating vessel, 20 Figure 7a is a schematic showing the device of Figure 6 under a flat surface of liquid Figure 7b is a schematic showing the device of Figure 6 under a crest, such that the head of liquid above has increased, Figure 7c is a schematic showing the device of Figure 6 under a trough, such that the head of liquid is reduced, 25 Figure 8 shows a practical arrangement of the embodiment shown in Figure 6, Figure 9 is a schematic for a method of converting energy of motion using hydraulics and a motor alternator set, Figure 10 is a schematic of a modification of the device of Figure 6. 30 Detailed Description of the Drawings The invention provides a device for extracting energy from a fluid body based on WO 99/28623 PCT/IE98/00101 9 the reaction of a submerged, sealed, and elastic or otherwise compressible device partially filled with air or other gas, to changes in pressure around it. These changes in pressure result from an over-passing ocean swell or changing surface levels in a tank.
Dolor De Hombro
Figure 2a shows the variable buoyancy 6 moored, via an inelastic mooring line 2 (or cables) , to the bottom 3 of a liquid mass 4 , having a flat surface 5. In this single action embodiment, the variable buoyancy 6 is a balloon type structure, made of, or partly made of, elastic or otherwise flexible material that may change in 25 shape and size according to the pressure exerted on the gas 7 contained therein. The change in buoyancy, caused by the reduction in volume of the variable buoyancy 6, results in less tension T 2 being exerted on the hydraulic actuator 8. 20 Figure 2c shows an equivalent situation for when the device 1 is under a trough 11 of a wave. A double acting hydraulic cylinder 12 is attached to a hydraulic spring or counterweight 26 and has a self contained oil reservoir 18. The forces 30 exerted by the variable buoyant member (not shown) displaces high pressure oil from the pump 16 through high pressure oil lines 19 to a distribution manifold 20 and high pressure oil accumulators 21. The displaced hydraulic fluid, under pressure, drives a WO 99/28623 PCT/IE98/00101 15 hydraulic motor 22 which in turn powers an electricity motor-generator set 23, and is then returned to the low pressure side of the hydraulic pump 16 via a low pressure oil line 24. Dolor de espalda a la altura del pecho . 5 Although each wave energy converter device may be deployed as an independent single entity, it may be desirable and expedient to arrange a number of similar devices in an array.
Fisioterapia Querétaro Calendarios
The variable buoyancy 6 is attached to hydraulic actuators 8 via an anchoring cable 9. The pressure 30 exerted on the gas 7 in the variable buoyancy 6 is equivalent to atmospheric pressure plus the pressure exerted by the height of the water column hi. As the pressure increases the gas will expand, forcing the liquid to leave the container. Necessarily, the submerged variable buoyancy, which must be located where the hydrostatic pressures are also varying significantly, will experience these circular movements in the surrounding water. Figure 6 is a schematic indicating the basic form of an embodiment in which the wave energy converter reacts against a vessel floating on the surface of the body of 15 liquid. In a modification to this embodiment (not shown) the hydraulic cylinders may be located below the fixed mass, but the mode of operation is the same. 10 In a further embodiment said load is a buoyant member of non-variable buoyancy attached to said buoyant member of variable buoyancy by a cable passing a pulley-type structure which acts to balance the buoyancy of the variable buoyancy in its normal condition.