Method of production work from thermal exchanging in counter- current streams is realised by recuperation of overflow internal energy from working mass. Inside countercurrent exchanger the overflow internal energy from the heated in a previous cycle working mass, will be transferred into the cool working mass for next cycle. An example of the heat engine, built on this method, includes two cylinders which are connected through countercurrent exchanger E. Under piston PC1 in cylinder C1 there is working mass in liquid phase. In the right cylinder C2 there is working mass in gas phase under piston PC2. The work W1xpended in C1 when the force acts on piston PC1 and liquid phase is moving from C1 into C2 through E, but gas phase is moving towards from C2 into C1. Overflow internal energy AU from gas phase transferred into internal energy of liquid phase. As result piston PC2 is moving up and producing positive work W2=ΔU>W1.

The invention relates to an underwater pumped-storage power plant for the temporary, reversible intermediate storage of electric energy from other power plants, in particular wind turbines and/or photovoltaic systems. The pumped-storage power plant comprises a pressure storing system with at least two pressure containers which can be filled with water and which form a common pressure storage volume; a water outlet for discharging water from the pressure storing system directly into the surrounding sea against the hydrostatic water pressure (PT) corresponding to the water depth (T); a pump which is arranged at the water outlet for pumping water out of the pressure storing system into the surroundings sea, said pump converting electric energy into corresponding potential energy of the displaced water column while the water is being pumped out against the hydrostatic water pressure (PT) of the surroundings sea; a water inlet for introducing water directly from the surrounding sea into the pressure storing system with the hydrostatic water pressure (PT) corresponding to the water depth; a common generator arranged at the water inlet, said common generator converting the potential energy of the previously displaced water column back into electric energy while the water is being introduced with the hydrostatic water pressure (PT) at the water depth (T); and electric lines for transmitting the electric energy from the water surface to the underwater pumped-storage power plant and back. The pressure containers are pressure-resistant such that said pressure containers can be pumped empty by means of the pump in a dimensionally-stable manner against the hydrostatic water pressure (PT) at the sea bed.

A wave-power device comprising a rotatable elongate part comprising axle and a buoyant structure helically coiled around the axle and extending at least part of the length thereof, the rotatable elongate part being connected to a power generator, characterised in that the buoyant structure has a cross-sectional shape having a width greater than its height.

Provided is a water intake device in which trash is less likely to accumulate and for which maintenance is easy, which has good usability without restriction of suitable installation locations, and which can be used in a water using device such as a small-scale water powered generator or in various water using facilities, etc. The water intake device (1) is provided with the following: a water intake chamber (4) the upstream side of which is closed by a cover member (8) and on the downstream side of which a water supply inlet (4a) is provided in an open state; a plurality of perpendicular plates (6) provided in a row along the lateral part of a portion of the water intake chamber (4) that is formed wider on the downstream side; a rotation roller (7) disposed on the upstream side of the cover member (8) and rotatable about a vertical line; and support plates (2, 3) that sandwich the water intake chamber (4) from above and below and support the perpendicular plates (6). The water of a river, channel, etc. flows into the water intake chamber (4) via openings (9) adjacent to the perpendicular plates (6), is discharged from the water supply inlet (4a), and is provided to a small-scale water powered generator, etc., or is drained.

The present invention pertains to a fluid power generation system, comprising: a shaft; a plurality of blade sections rotationally mounted on the shaft in a line and rotating by the flow of fluid; generators mounted on each of the blade sections for generating electricity by the rotation of the blade sections; a support section for supporting the shaft; a fixing block for fixing the support section on the surface of ground; a rotation section disposed between the fixing block and the support section for rotating the shaft in the horizontal direction; a direction-indicating section mounted on the support section for rotating the front portion of the shaft with respect to the fixing block in the flow direction of the fluid by the flow of the fluid; and a storage battery for charging the electricity which is generated by the generators, wherein the direction-indicating section is mounted to be slanted in the horizontal direction from the longitudinal direction of the shaft such that the shaft is located to be inclined towards the flow direction of the fluid.

A perpetual motion gravity & buoyancy engine consists of two wheels (4), two shafts (10), 2n number of capsules (1) with/without an airbag, a belt (5), shaft less dumbbell shape pistons (3) with/without a valve, a flywheel (11), and flexible pipes (8). The two wheels (4) are provided on the two shafts (10) with particular distance and connected with the belt (5). The flywheel (11) is connected with an upper side shaft which is further connected with a generator or gearbox (6). The shaft less dumbbell shape pistons (3) with the valve are provided inside the cylindrical shape capsules (1) which can move up and down by gravitational force with the valve. The generator or the gearbox (6) is provided between the two wheels (4). One end of the 2n number of capsules (1) is open and the other end is connected with the flexible pipe (8). The front side of the first capsule is connected with the front side of the second capsule through the flexible pipe (8). An air compressor (7) is provided to blow out the air to accelerate the circulation speed of the capsules.

Embodiments provide a friction disc component 100 which comprises a fastening possibility 120 for connecting two assembly parts 130; 130a, wherein the friction disc component 100 has a coating 125 which increases a frictional force between the friction disc component 100 and at least one of the assembly parts 130, 130a, and has, furthermore, a recess 115 for a seal 119, such that the friction disc component 100 can be connected to at least one of the assembly parts 130; 130a in a watertight manner.

The invention relates to a method and a system (10) for generating electric power and optionally heat from geothermal energy or terrestrial heat. The system (10) comprises a borehole (12) introduced into the ground and a circuit (14) for a working medium that contains at least one organic compound suitable as a refrigerant. The circuit (14) comprises, inside the bore hole (12), a pipe string (30) through which working medium can be made to flow, with a central downpipe (32) and a riser pipe (34) surrounding the downpipe (32) and communicating with the downpipe (32) at the lower end (16) of the borehole (12). The working medium flows in liquid form through the downpipe (32), from which it reaches the riser pipe (34) at the lower end (16) of the borehole (12), where it is heated by the geothermal energy or terrestrial heat and is vaporised. An expansion machine (36) is also provided, wherein the vaporized working medium under pressure, or an additional working medium heated and vaporised by the working medium by heat exchange, is decompressed and performs work.

The invention relates to a concept for sealing a bearing component (110; 110a; 110b) for a bearing (100), which bearing component has a fastening possibility (120) for fastening to a component (130) to be supported, wherein the bearing component (110; 110a; 110b) or the component (130) to be supported has a recess (115, 117) for a seal (119), in such a way that the bearing component (110; 110a; 110b) can be connected to the component (130) to be supported at least a watertight manner. The concept also provides for an underwater power plant having a bearing component (110; 110a; 110b) or a bearing (100) and a drive shaft (130), which are mechanically coupled to one another and between which a seal (119) is located for sealing.

Device (100) for conversion of mechanical energy from sea waves to electric energy, characterized by: - at least a float (101) and two rigid rods (102), (103), preferably anchored at one end to the seabed (108), and at the other end to the float (101) through flexible cables (106), (107); two respective masses (104), (105) keep the free ends of that rods (102), (103), constantly in traction condition pulled towards the sea bed (108); - at least a power generator (109), or other similar device suitable to convert and/or transmit energy, that is placed close to its respective hinge (110), (111), placed at the bottom parts of the rods (102), (103), so that the oscillatory motion of the float (101), following the waves level (112), causes a force with a vertical component that leads to a rotatory and oscillatory motion of the rods (102), (103), which are pivoted on its respective hinge (110), (111), and generates therefore electric energy by motion of gears of the same generator (109); the horizontal component of the force due to the float (101) oscillations is balanced by a system of counterweights, so that the same float (101) tends to place itself constantly on vertical line A-A'.