Abstract: A method or apparatus that uses a fluid in a closed loop well system to extract heat from geothermal resources that are located in or near high-temperature, low-permeable geologic formations to produce power. In some embodiments, the closed loop system may include one or more heat exchange zones, where at least a portion of the one or more heat exchange zones may be disposed within a subterranean region having a temperature of at least 350° C. The subterranean region may be within a plastic zone or within 1000 meters of the plastic zone, the plastic zone having a temperature gradient of at least 80° C. per kilometer depth.

Abstract: An apparatus includes a generator configured to generate electrical power. The apparatus also includes first and second tanks each configured to receive and store a refrigerant under pressure. The apparatus further includes a first piston assembly having a first piston that divides a volume within the first piston assembly into first and second spaces each configured to receive refrigerant from at least one of the tanks. In addition, the apparatus includes a second piston assembly having a second piston coupled to the first piston. The generator is configured to generate the electrical power based on movement of at least one of the first and second pistons. During use, flows of the refrigerant between the tanks and the spaces can be created based on a pressure differential, such as a pressure differential created by a temperature difference between the tanks.

Abstract: An evaporator which heats working fluid with high-temperature fluid to evaporate the working fluid includes: a working fluid channel arranged in a flow direction of the high temperature fluid and through which the working fluid flows; and a temperature sensor provided for the working fluid channel. A part of the working fluid channel is exposed to outside of a housing of the evaporator, and the temperature sensor is provided in the part of the working fluid channel exposed to the outside of the housing of the evaporator in a region other than an inlet of the working fluid channel into which the working fluid flows from the outside of the evaporator and other than an outlet of the working fluid channel through which the working fluid flows out of the evaporator. The output value of the temperature sensor is used to adjust the temperature of the working fluid.

Abstract: A wave energy collector placed in ocean water a given distance from a shoreline, the wave energy collector formed by at least one parallelogram structure with an even number of mechanical actuators are positioned within the parallelogram structure. Each mechanical actuator has a respective hose with a check valve to suck ocean water in and blow ocean water out under pressure for energy conversion.

Abstract: In a compressed air energy storage and power generation device, a compressed air energy storage and power generation method defines, as a reference storage value, a storage value indicating that a storage amount of air in an accumulator tank is in a predetermined intermediate state. At the reference storage value, at least one of a motor and a generator rotates at a rated rotation speed. When a storage value indicating a current storage amount in the accumulator tank is larger than the reference storage value, at least one of the motor and the generator is controlled to rotate at equal to or less than the rated rotation speed. When the storage value indicating the current storage amount in the accumulator tank is smaller than the reference storage value, at least one of the motor and the generator is controlled to rotate at equal to or more than the rated rotation speed and equal to or less than a maximum permissible rotation speed.

Abstract: A valve module is provided in a steam turbine and a power generation system. The valve module includes a stop valve, a control valve, and a case. The stop valve includes a stem to reciprocate rectilinearly between a first position and a second position, a stop valve disc mounted to an upper portion of the stem, to pass fluid when the stem is in the first position and to block fluid flow when the stem is in the second position, and a sealing member surrounding the stem and configured to prevent exposure of the stem when the stop valve disc is located at the first position. The valve module is capable of protecting a stem from high-pressure fluid that is introduced to the stop valve.

Abstract: The present disclosure relates to apparatus and methods of generating power that utilise the flow of vapour between two or more liquid bodies having different vapour pressures. Power is generated as a result of the flow of vapour from a liquid body having a higher vapour pressure to a liquid body having a lower vapour pressure.

Abstract: The present invention relates to a soft actuator moving linearly against external stimuli whose expansion and contraction can be actively controlled, suggesting that the actuator of the invention overcomes the problems of the conventional soft actuators, The soft actuator of the present invention can be repetitively driven quickly and accurately by controlling heating and cooling by using thermoelectric effect and, the soft actuator of the present invention can realize bending, tensioning, compression, and rotational driving of a tubular device containing a driver.

Abstract: The invention relates to a method for obtaining energy from the Earth's gravitational force, in particular for producing a rotational movement, which method is designed in such a way that working bodies (7) are introduced into a liquid column (1) or into communicating liquid columns (1) by introducing devices (11), the action of which is oriented toward one another, counter to the water pressure, in such a way that the force/energy needed for the introduction into the (one) liquid column (1) is at least partly compensated by a force/energy resulting from the same or other liquid column (1). A device for producing rotational movement uses the method according to the invention.

Abstract: A radiant heat recovery heater includes U-shaped heat transfer tubes each including a first path and a second path arranged on a mounting section. The U-shaped heat transfer tubes are housed in a container fixed to the mounting section. The first paths and the second paths of the U-shaped heat transfer tubes are arranged on the mounting section at equal intervals with a pitch angle ?. The first paths are each arranged on the mounting section at a position offset from the pitch angle ? for the associated second path by a predetermined angle ?, so as not to completely overlap a projection of that second path, the projection extending from the container toward the center C of the container.

Abstract: An apparatus powered by piston buoyancy is provided to generate rotary power by utilizing the effects of buoyancy and includes a tank containing a volume of liquid below a liquid level. A crankshaft is provided and is rotatably mounted to the tank above the liquid level. The crankshaft includes a rotatable main shaft. A hollow piston is disposed within the liquid in the tank and is provided having an interior cavity, an open bottom and one or more movable trap doors located at the top of the piston. A piston rod connects the hollow piston to a section of the crankshaft offset from a longitudinal axis of the main shaft. A gas supply system is provided having an outlet positioned beneath the open bottom end of the piston to supply gas to the interior cavity of the hollow piston and cause the piston to move upward and rotate the crankshaft.

Abstract: Systems and methods disclosed herein provide a tidal power generator including a first container, a second container coupled to the first container, a frame pivotably coupled to the second container, a first valve, associated with the second container, configured to selectively control ingress of a first volume of a fluid into the second container, and a second valve, associated with the second container, configured to selectively control egress of a second volume of the fluid out of the second container.

Abstract: A supercritical CO2 generation system using plural heat sources, includes: a pump configured to circulate a working fluid; heat exchangers configured to heat the working fluid using an external heat source; turbines configured to be driven by the working fluid heated by passing through the heat exchanger; and recuperators configured to exchange heat between the working fluid passing through the turbine and the working fluid passing through the pump to cool the working fluid passing through the turbine, in which the heat exchanger includes constrained heat exchangers having an emission regulation condition of an outlet end and heat exchangers without the emission regulation condition.

Abstract: Heat transfer fluid in vapor only state is cycled through solar collector(s) (12) and a sensible heat storage medium (14) to transfer heat from the solar collector(s) (12) to the sensible heat storage medium (14). The heat transfer fluid is a liquid at ambient temperature, but substantially in the vapor state throughout the entire cycle when in operation.

Abstract: A device for controlling a supply of a working fluid to a power generation cycle with a compressor compressing the working fluid and a precooler cooling the working fluid supplied to the compressor comprises a storage tank storing the working fluid supplied to the power generation cycle and a flotation tank disposed between the precooler and the compressor to flow or temporarily store the working fluid, wherein a pressure within the flotation tank and a flow rate of the working fluid are controlled based on pressures at an inlet of the compressor and an outlet of the precooler.

Abstract: The present application relates to a modular tower-type solar thermal power generation system, which comprises: a solar thermal collector device configured for collecting solar thermal energy, a heat exchanger connected to the solar thermal collector device and configured for producing superheated saturated steam, and a thermal power conversion device connected to the heat exchanger and configured for converting the superheated saturated steam into electrical energy; the solar thermal collector device comprises a plurality of tower-type solar thermal modules.

Abstract: A Rankine cycle apparatus includes a pump, an evaporator, an expander, a condenser, and an internal heat exchanger. The internal heat exchanger allows heat exchange to take place between a working fluid discharged from the expander and a working fluid discharged from the pump. A temperature of the working fluid at an inlet of the expander is set so that a temperature of the working fluid at an outlet of the expander be higher than a saturation temperature on a high-pressure side of the cycle.

Abstract: The present application discloses an energy harvesting system for harvesting energy from water waves, such as ocean waves. The energy harvesting system comprises: a base rotational mechanism comprising a first shaft and a positive rotational direction about the axis of the first shaft; an electricity generator configured to generate electricity from the rotation of the first shaft in the positive rotational direction; and a plurality of rotation driving apparatuses. Each rotation driving apparatus comprises a freewheel mechanism whose axis of rotation is the same as the axis of the first shaft, a swing component which may make a two-way rotation of limited angular range, a floating component comprising a buoy which is connected to an of the swing component, and a spring or weight which directly or indirectly exerts a force on the swing component.

Abstract: A combined heat and power system, or an energy system, is provided. A four-stroke opposed-piston engine provides efficient power from a generator set or genset. A heat exchange system is provided within the energy system to provide efficient waste heat recovery as the engine is operated.

Abstract: A wax filled actuator includes a piston in direct contact with the thermally responsive wax material. A cup containing the wax is mechanically secured to a guide that receives and controls axial movement of the piston in response to expansion and contraction of the wax. A seal between the cup and guide prevents leakage of the wax. Another seal surrounds the piston and prevents leakage of the wax around the piston. In a disclosed embodiment, the piston has a cylindrical, polished outside surface that aids in preventing adhesion of the wax to the piston. In a disclosed embodiment, the seal surrounding the piston is a radially compressed annular elastomeric member. The seal surrounding the piston may be disposed between flat, annular wipers. The seal and wipers may be axially retained between the guide and a washer trapped between the cup and guide.