The present invention relates to a hydroelectric power generation device using a multistage cascade structure. The hydroelectric power generation device includes: a support (10) having a predetermined length and installed in a vertical direction; a plurality of waterwheels (20) each including a horizontal axle (21) rotatably installed on the support (10) and a plurality of buckets (22) radially arranged around the axle (21); upper and lower water tanks (30, 40) respectively installed on upper and lower portions of the support (10) and respectively containing predetermined amounts of water; a pump (50) installed in the lower water tank (40) to supply water from the lower water tank (40) to the upper water tank (30); generators (60) respectively installed on the axles (21) of the waterwheels (20); and a charging battery (70) configured to store electricity produced by the generators (60). Thus, according to the present invention, electricity can be stably and effectively produced.

Systems for pumping water are described. The system can include a covered pool containing a first volume of water, an oared water pump with a plurality of radial oars, an upper reservoir configured in fluid communication with the covered pool, a lower reservoir and a hydroelectric system. The oared pump can pump water from the covered pool into the upper reservoir. The upper reservoir can be configured to communicate water to the lower reservoir through the hydroelectric system with the lower reservoir configured in fluid communication with the covered pool.

The present invention relates to an electric power generator system/set (40) configured to generate fuel-free electric power having a fairing (12), a turbine (1), a gearbox (6), an alternator (10) and a hydraulic pump motor (14). Said hydraulic pump motor (14) being configured to emit an oil jet against the vanes (2) of the turbine (1), causing it to rotate and generate mechanical power.

Said mechanical power generated by the rotation of the turbine (1) is transmitted to the gearbox (6), enhancing this mechanical power and transmitting it to the alternator (10), configured to transform the mechanical power generated by the turbine (1) in electric power.

A computer-implemented method of closed-loop dissolved oxygen monitoring and control at a hydroelectric plant includes: regulating at least one aeration valve coupled to a turbine using pattern recognition; wherein a target parameter for the regulating is a dissolved oxygen concentration of water downstream of the hydroelectric plant. The dissolved oxygen concentration may be at least 5.0 milligrams per liter. The pattern recognition may be performed using a neural network.

Rotary valve device for sequentially connecting an first line to a plurality of second lines, the rotary valve device comprising: a stationary structure comprising a first port for connection to the first line and at least two second ports for connection to a respective second line and a distribution rotor rotatably arranged within the stationary structure, the distribution rotor comprising at least one rotor opening, wherein the rotary valve device is configured such that the rotor opening sequentially establishes a fluid communication between the first port and the second ports as the distribution rotor rotates.

A convective power generation device is described based on thermal convection and thermal input energy. The energy generation device operates by heating wax and oil by heat from a solar concentrator or geothermal energy; as the weight of the wax becomes liquid that is lighter than the oil, the liquid wax moves up through a pathway; when the liquid wax reaches the top of the pathway, the cooler wax falls towards collecting cups mounted to a continuous belt and forces the belt downward to rotate the belt; when a collector cup of wax reaches the bottom of belt rotation, the wax falls to a reservoir; and the rotation of the belt drives a gearbox, which drives a generator to produce electric power. The convective power generation device has been shown to have higher energy conversion efficiency than photovoltaics.

A hydroelectric plant has concentric inner and outer pipes, an air flow channel allowing air flow between these pipes, and floodgate pipes with water flow channels where the water flow is allowed through the inner pipe, an air supply block with a multitude of air inlet vents-which supply air to the mentioned air flow channel and a multitude of water impact paddles upon which the water flowing out of the floodgate pipes via the air supply is impacted.

Disclosed herein is a hydropower electric generator, in accordance with some embodiments. Accordingly, the hydropower electric generator may include a closed conduit. Further, the closed conduit may include a reservoir, two downward flow pipes, two horizontal pipes, and two upward flow pipes. Further, the downward flow pipes may include turbines configured to intercept the downward flow of the water and generate rotational force. Further, the upward flow pipe may include an airlift assembly configured to receive compressed air into the upward flow pipe. Further, the hydropower electric generator may include an air pump configured to generate the compressed air based on electrical energy. Further, the hydropower electric generator may include an energy storage device.

An energy conversion system comprising: a riser conduit comprising a first liquid; a down-comer comprising a second liquid, the down-comer in fluid communication with the riser conduit, the second liquid comprising first liquid and finely divided material in suspension such that the second liquid has a higher specific gravity than the first liquid, the down-comer in fluid communication with a first tank and a second tank; a converter device arranged to convert energy of the first liquid into energy for output from the energy conversion system, and to discharge the first liquid thereafter; and a recirculator arranged to recirculate third liquid to maintain the finely divided material in suspension, the third liquid comprising second liquid and further finely divided material in suspension. The recirculator is arranged to discharge the third liquid to mix with the first liquid from the converter device to form the second liquid. The first tank and the second tank are arranged between the converter device and the down-comer, to receive the first liquid discharged from the converter and to supply the first liquid to the down-comer. Supply of first liquid to the first and second tanks is in use regulated to maintain the height of liquid in the first and second tanks below a predetermined threshold.

An apparatus for generating energy by intake and drainage of a fluid includes a reservoir and a pair of receptacles in fluid communication with the reservoir and mounted above the reservoir. Each of the pair of receptacles has a variable volume for holding the fluid. The variable volume is controlled by movable portions. The apparatus includes a lever rotatable about a lever pivot. The lever is coupled at a first side of the lever pivot to the movable portions associated with a first one of the pair of receptacles. The lever is coupled at a second side of the lever pivot to moveable portions associated with a second one of the pair of receptacles. The apparatus includes control valves controlling fluid communication between the pair of receptacles and the reservoir and a controller coupled to the control valves. The apparatus includes a generator coupled to moving portions.