Abstract: A system, composition and method for controlling fracture grown in the extraction of geothermal energy from an underground formation includes (i) introducing a first fracking fluid into an underground formation; (ii) introducing a second fracking fluid into the underground formation; wherein the specific gravity of the second fracking fluid is different from the specific gravity of the first fracturing fluid, thereby controlling the growth of at least one fracture in a downward direction, and wherein the fracking fluid in at least one of steps (i) or (ii) contains proppant particles having a thermal conductivity contrast of at least 5.

Abstract: The invention relates to a system that includes a wave energy converter and an assembly, adapted to be driven by the wave energy converter. The wave energy converter includes an array, in the form of rows and columns, of floating elements adapted to float on a sea surface in the vicinity of a shore. Each floating element has a first and a second end, each end being connected to a lever, the lever being connected through a bearing to a pivot point. Each lever is connected in an articulated manner to a piston rod in a wave-actuated liquid pump, that is in fluid communication with the pipe, adapted to lead a liquid to a workstation, wherein the workstation includes the assembly.

Abstract: A geothermal heat exchanger, a geothermal heat arrangement and to a method in connection with a geothermal heat arrangement. The geothermal heat exchanger includes a piping arrangement having a rise pipe and a drain pipe, and a first pump arranged to the piping arrangement. The rise pipe and drain pipe are arranged in fluid communication with each other for circulating the primary working fluid. The rise pipe is provided with a first thermal insulation surrounding the rise pipe along at least part of the length of the rise pipe and the first pump is arranged to circulate the primary working fluid in a direction towards a lower end of the rise pump.

Abstract: A support for an exhaust stack comprises a first bracket including a first base joining a first extension and a second extension, the first base being fixed to the vehicle, and a second bracket including a second base joining a third extension and a fourth extension, the second base being fixed to the exhaust stack. A member is disposed between the first base and the second base. The member has a first end and a second end. A first fastener is accepted by the first end and extends between the first extension and the second extension. A second fastener is accepted by the second end and extends between the third extension and the fourth extension.

Abstract: A scroll device has a fixed scroll, and orbiting scroll, and at least an integrated cooling loop configured to receive coolant to cool the fixed scroll and the orbiting scroll. A flexible conduit is provided that curves radially around an orbital axis of the orbiting scroll to transfer coolant along integrated cooling loop. The integrated cooling loop separates coolant used to cool the fixed scroll and the orbiting scroll from the involutes of the scroll device providing clean operation of the scroll device. The integrated cooling loop may be defined by the flexible conduit, one or more cooling chambers, and/or one or more cooling passageways.

Abstract: Provided is a helical strake set to reduce vortex induced vibrations of a tower, intended to be transported unassembled in a container, including a plurality of identical attachable segments, wherein each segment includes a main body of hollow pyramidal configuration including a wide polygonal end a narrow polygonal end and a narrow polygonal portion firmly attached to the narrow polygonal end, and each segment further including a cap including a wide polygonal portion able to fit in the wide polygonal end by a fastening element, wherein all main bodies and caps are able to be piled in one into another in a container yielding a significant reduction in seaborn transport volume and later assembled on site to reduce vortex induced vibrations of a tower.

Abstract: A system for offshore electricity generation and direct carbon dioxide sequestration includes an offshore marine platform on which is mounted a plurality of internal combustion engines. The marine platform is deployed above an offshore, subsea storage reservoir. The internal combustion engines drive electric generators to produce electricity. Flue gas from the internal combustion engines is directed to a carbon dioxide capture system adjacent the internal combustion engines and in fluid communication with the flue gas exhausts of the internal combustion engines. The carbon dioxide capture system captures gaseous carbon dioxide from the flue gas, and then injects the captured carbon dioxide directly into the offshore, subsea storage reservoir. Compressors in fluid communication with the carbon dioxide capture system may be utilized to increase the pressure of the captured gaseous carbon dioxide to a desired injection pressure.

Abstract: An energy storage system converts variable renewable electricity (VRE) to continuous heat at over 1000° C. Intermittent electrical energy heats a solid medium. Heat from the solid medium is delivered continuously on demand. An array of bricks incorporating internal radiation cavities is directly heated by thermal radiation. The cavities facilitate rapid, uniform heating via reradiation. Heat delivery via flowing gas establishes a thermocline which maintains high outlet temperature throughout discharge. Gas flows through structured pathways within the array, delivering heat which may be used for processes including calcination, hydrogen electrolysis, steam generation, and thermal power generation and cogeneration. Groups of thermal storage arrays may be controlled and operated at high temperatures without thermal runaway via deep-discharge sequencing. Forecast-based control enables continuous, year-round heat supply using current and advance information of weather and VRE availability.

Abstract: A pump stage assembly including at least two pump suction stages and at least one pump pressure stage. The pump suction stages and the pump pressure stage are arranged spaced apart from one another in a pump housing PG and have a common drive shaft. The pump suction stages are formed by a first assembly of intermeshing external gearwheels that lie in a first plane, and the pump pressure stage is formed by a second assembly of intermeshing external gearwheels that lie in a second plane. A first delivery volume flow can be drawn in from a first region of a dry sump by a first pump suction stage, and a second delivery volume flow can be drawn in from a second region of the dry sump by a second pump suction stage. The two delivery volume flows intermix in the pump housing before they reach an oil tank.

Abstract: An improved screw-spindle pump, particularly for cooling systems, includes a first screw, a second screw and a pump housing, inside which the first screw and the second screw are rotatably housed between the first screw, the second screw and the pump housing, being defined pumping chambers adapted to move, as a consequence of the rotation of the first screw and the second screw, a fluid from a suction area to a delivery area of the pump. The pump housing housing the first screw and the second screw is made in one piece.

Abstract: Energy harvesters (EH) which can effectively harvest wasted vibrational/kinematic energy and convert it into electrical energy for battery-free sensor operation are described herein. The target application of the energy harvesters includes powering wireless sensors used for wind turbine blade structural monitoring.

Abstract: A power system includes a liquid hydrogen fuel source including a fuel tank containing a volume of hydrogen fuel. The fuel tank includes two or more vacuum insulation layers, and a liquid insulation material positioned between the two or more vacuum insulation layers. A first power generator located fluidly downstream of the hydrogen fuel source. The first power generator utilizes a flow of hydrogen fuel from the volume of hydrogen fuel to generate electrical or mechanical power.

Abstract: Systems and methods for conditioning an aftertreatment system. For example, a computer-implemented method for conditioning an aftertreatment system of a hybrid system including an electric motor and a combustion engine includes: determining whether the aftertreatment system is in a first temperature zone below a first temperature threshold; determining whether a power demand corresponding to the operation of the hybrid system is in a first power demand zone below a power threshold; and if the aftertreatment system is determined to be in the first temperature zone and the power demand of the hybrid system is determined to be in the first power demand zone, setting the hybrid system to compressor mode to heat the aftertreatment system.

Abstract: A plant for storing and discharging thermal energy comprises a first heat exchanger coupled to a heat source, a second heat exchanger coupled to a heat user, a fluid configured to store thermal energy, a storage device for the fluid, a circuit configured to couple the first heat exchanger, the second heat exchanger and the storage device. The storage device comprises N+B storage sections fluidly connected to each other, where N is equal to or greater than two and B is less than N; each of the N+B storage sections has a same containment volume. The fluid occupies a volume substantially equal to N times the containment volume. A separation gas is inserted in the storage device, is in contact with the fluid and is configured to always keep separate a hot portion of the fluid from a cold portion of the same fluid.

Abstract: An internal combustion engine includes an engine body defining a combustion chamber, an ignition device configured to ignite mixture in the combustion chamber, an operation device configured to receive a stop operation to stop the internal combustion engine, a controller configured to stop the ignition device from igniting the mixture in response to reception of the stop operation by the operation device, a carburetor configured to supply fuel to an intake passage that communicates with the combustion chamber, a switching valve provided in the intake passage, and an adjustment device configured to adjust an opening degree of the switching valve, wherein the adjustment device is configured to close the switching valve in conjunction with the reception of the stop operation by the operation device.

Abstract: The present disclosure provides a comprehensive utilization method and test equipment for surface water, a goaf and geothermal energy in a coal mining subsidence area. The method comprises the following steps: determining a geothermal water collection area, arranging heat energy exchange equipment in a main roadway, and arranging a geothermal water extraction system, wherein the geothermal water extraction system comprises geothermal wells, extraction pipelines and tail water reinjection pipelines, the extraction pipelines are connected with the heat energy exchange equipment, and the tail water reinjection pipelines are connected with a water outlet of the heat energy exchange equipment; arranging a water channel on the surface, and arranging a drainage system on a subsidence trough to guide surface water to flow underground; and controlling directional and ordered flow of surface water through the coal mining subsidence area formed by ground mining to achieve sustainable mining of underground water.

Abstract: A thermal storage subsystem may include at least a first storage reservoir configured to contain a thermal storage liquid at a storage pressure that is greater than atmospheric pressure. A liquid passage may have an inlet connectable to a thermal storage liquid source and configured to convey the thermal storage liquid to the liquid reservoir. A first heat exchanger may be provided in the liquid inlet passage and may be in fluid communication between the first compression stage and the accumulator, whereby thermal energy can be transferred from a compressed gas stream exiting a gas compressor/expander subsystem to the thermal storage liquid.

Abstract: Provided is a motor-integrated fluid machine that has improved performance and reliability by efficiently cooling a fluid machine body and a motor without increasing an installation space. The present invention is characterized by being provided with: a fluid machine unit that compresses or expands a fluid; a motor unit that has a drive shaft connected to the fluid machine unit; and a cooling fan that cools the motor unit and the fluid machine unit by sucking cooling air from the motor unit side and that is connected to the drive shaft at the side opposed to that connected to the fluid machine unit, wherein between the motor unit and the cooling fan, the minimum sectional area of a cooling air passage from the outside in the radial direction toward the drive shaft is larger than that of a cooling air passage from the motor unit side toward the cooling fan.

Abstract: The present disclosure discloses a wind-solar reactor system and a working method thereof. The wind-solar reactor system comprises a nuclear reactor system, a wind power generation system, a solar power storage system and a balance energy system, wherein the nuclear reactor system uses an integrated small modular reactor design, the solar power storage system uses a tower-type solar power storage system design, and a hydrogen production system uses a copper-chlorine cycle hydrogen production technology. A reactor keeps rated full-power operation, generated electricity is adjusted and distributed through a power controller, most of the electricity is used for smoothing the fluctuation of wind power generation, and the excess electricity is used for hydrogen storage of the hydrogen system. Solar power is used for heating saturated steam generated by the reactor into superheated steam through a heater, and then the superheated steam enters a high-pressure cylinder to do work by expansion.

Abstract: A tidal power generation system has a vertical post being embedded in a sea floor and a floating barge operably coupled to the post. The floating barge has a gear rotationally driven by the post as the floating barge moves vertically with respect to the vertical post. An offshore hydraulic pump is operably connected to the gear, an onshore hydraulic motor operably connected to the offshore hydraulic pump by a hydraulic circuit; and an electric generator is operably connected to the onshore hydraulic motor.