Abstract: A semisubmersible offshore support structure for a wind turbine carries an adjustable-ballast reservoir above sea level fillable with water for providing extra load on a part of the support structure. By adjusting the water volume in the adjustable-ballast reservoirs, the wind turbine can be maintained in vertical orientation despite wind pressure. A drain is provided for draining water from the reservoir into the sea by gravity only for emptying the reservoir passively in case of power failure.

Abstract: In an assembly of an offshore support structure for a wind turbine, tubular members are interconnected in grouted connections where a first tubular member has fastened to it a shell-unit comprising a cavity into which an end-part of a second tubular member is inserted and fixed by grouting. The cavity is closed by a rigid entrance-flange that is fastened to the walls of the shell-unit. The design converts forces acting on the second tubular member to compression forces acting on the grout in the cavity.

Abstract: An electrolysis system with a buffer tank An electrolysis system for production of hydrogen and/or oxygen comprising a stack of electrolysis cells inside a pressure vessel (18). Each electrolysis cell in the stack comprises a membrane (82A, 82B) and a cassette (12) made of a bipolar plate (74) sand-wiched by a cathode (30B) and an anode (78) forming a cathode compartment and an anode compartment on each side of the bipolar plate (74). The stack is enclosed in a container constituting a buffer container for storing hydrogen released in the stack. The stack has an outlet constituting a hydrogen outlet for flow of hydrogen gas into said buffer container for filling the buffer container with hydrogen gas.

Abstract: Various embodiments of the present disclosure are directed to offshore frame construction. In one example embodiment, an offshore frame construction is disclosed including structural members and a structural joint connecting the structural members. The structural joint includes a fork part, an ear part, and a pin, where the fork part and the ear part includes a bore, and the pin is inserted into the bore. The pin has a non-corroding surface that is a cladding or bushing welded or shrunk or glued or otherwise affixed to the pin which consists of a different material, or the non-corroding surface is continuous with the pin and the pin consists of the non-corroding material. In some specific embodiments, the bore includes a sliding surface, which is fitted with a liner acting as a bearing, and the bearing is an elastomeric bearing.

Abstract: An offshore floating structure is provided including a floater with positive buoyancy and a keel with negative buoyancy, as well as active and passive suspenders connecting nodes of the keel and the floater with each other. When the keel at the offshore site is lowered by making the active suspenders longer, the passive suspenders, which have a fixed length and are held taut, causes the keel to rotate about the vertical during lowering.

Abstract: Electrolyzer comprising modules that sandwich ion-transporting membranes in between adjacent modules. The modules are formed as four-layer structures of four metal plates, typically steel plates, including two separator plates combined into a BPP and an anode plate and a cathode plate respectively on opposite sides of the BPP. The four plates are welded together to form a rigid module with three separate compartments, one anode compartment, one cathode compartment and a coolant compartment.

Abstract: An offshore wind turbine installation comprising a wind turbine on a support structure. A concrete-cast transition piece is provided in between the tower of the wind turbine and a tower support of the support structure. Flanges of the tower and the tower support are either bolted to each other, sandwiching the transition piece in between, or bolted into the transition piece for fixation.

Abstract: In the assembly of an offshore support structure for a wind turbine, tubular braces are interconnected or connected to a tower support in cast connections where an end part of the corresponding brace is inserted into a sleeve that is fixed in the interconnecting brace or in the tower support, and the volume in between the sleeve and the end part of the inserted brace is filled by a casting material, typically grout.

Abstract: In the assembly of the support structure of a wind turbine, N sets of a first tubular brace and a second tubular brace extend from a tower support. For each set, the second braces are connected at one or both of their end parts by a casted connection. The first brace or the tower structure has a casting cavity for accommodating an end of the corresponding second brace. In order to assemble the construction, the second brace is inserted into the cavity, after which the end of the first brace is lifted until the end of the second brace is inserted deeply enough into the respective cavity.

Abstract: An electrolysis system with a buffer tank An electrolysis system for production of hydrogen and/or oxygen comprising a stack of electrolysis cells inside a pressure vessel (18). Each electrolysis cell in the stack comprises a membrane (82A, 82B) and a cassette (12) made of a bipolar plate (74) sand-wiched by a cathode (30B) and an anode (78) forming a cathode compartment and an anode compartment on each side of the bipolar plate (74). The stack is enclosed in a container constituting a buffer container for storing hydrogen released in the stack. The stack has an outlet constituting a hydrogen outlet for flow of hydrogen gas into said buffer container for filling the buffer container with hydrogen gas.

Abstract: An energy storage system comprises a hot thermal energy storage medium and a cold thermal energy storage medium, which are interconnected in a thermodynamic gas flow circuit with gas as a working fluid. An energy converter with a motor/generator system is functionally connected to a compressor/expander system for converting between electrical energy and thermal energy of the gaseous working fluid in the thermodynamic fluid circuit. A latent TES medium is thermally connected to the thermodynamic circuit for providing a lower limit for the temperature in the cold TES medium. Specifically, the latent TES medium is liquid, typically water, which is sprayed as droplets into a tank through which the gaseous working fluid flows at subzero temperatures to produce snow in order to efficiently heat the gas to the freezing point or above.

Abstract: An offshore platform with a wind turbine is provided including three buoyancy modules arranged in a triangular configuration in corners of an equilateral triangle, in the center of which the tower support for the tower of the wind turbine is located. The tower support is fixed in a frame including three radial braces, each of the radial braces rigidly connecting the tower support with one of the three buoyancy modules. The radial braces are inclined upwards from the tower support towards the buoyancy modules.

Abstract: An offshore wind turbine system is provided including a wind turbine in combination with a floating platform. The platform includes three buoyancy modules in corners of a triangular configuration. The tower is located off-centered near a baseline of the triangle midway between two buoyancy modules that are located at the ends of the baseline.

Abstract: An energy storage system comprises a hot thermal energy storage medium and a cold thermal energy storage medium, which are interconnected in a thermodynamic gas flow circuit with gas as a working fluid. An energy converter with a motor/generator system is functionally connected to a compressor/expander system for converting between electrical energy and thermal energy of the gaseous working fluid in the thermodynamic fluid circuit. A latent TES medium is thermally connected to the thermodynamic circuit for providing a lower limit for the temperature in the cold TES medium. Specifically, the latent TES medium is liquid, typically water, which is sprayed as droplets into a tank through which the gaseous working fluid flows at subzero temperatures to produce snow in order to efficiently heat the gas to the freezing point or above.

Abstract: Operation of an energy storage system comprising a thermodynamic cycle including first and second thermal reservoirs and a turbomachinery as energy converter for two-way conversion between electrical energy and thermal energy. For controlling the temperature in the system, the compression ratio of the turbomachinery is adjusted in real-time during charging on the basis of temperature measurements downstream of the compression and/or during discharging on the basis of temperature measurements downstream of the expansion.

Abstract: Two adjacent pipe flanges are secured by a plurality of clamp units, where each clamp unit, in order to receive the adjacent flanges in its receptacle, is thermally expanded.

Abstract: Thermal energy storage system with phase change material and method of its operation An energy storage system (100) comprises a hot thermal energy storage medium (5?) and a cold thermal energy storage medium (4?), which are interconnected in a thermo-dynamic gas flow circuit. An energy converter with a motor/generator system (1A, 1B) is functionally connected to a compressor/expander system (2) for converting between electrical energy and thermal energy of the gaseous working fluid in the thermodynamic fluid circuit. A latent thermal energy storage working fluid is thermally connected to the gas flow circuit through heat exchanger (8) for providing a limit for the temperature in the cold TES medium (4?).

Abstract: A method of operating an energy storage system (100), the system (100) comprising a thermodynamic cycle including a first thermal energy storage container (5) and an energy converter (1, 2, 3) for converting between electrical energy and thermal energy of the working fluid in the thermodynamic fluid cycle. For controlling the thermocline in the system without large thermal energy loss, it is pushed only partially out of the first thermal energy storage container (5).

Abstract: A method of operating an energy storage system (100), the system (100) comprising a thermodynamic cycle including a first thermal energy storage container (5) and an energy converter (1, 2, 3) for converting between electrical energy and thermal energy of the working fluid in the thermodynamic fluid cycle. For controlling the thermocline in the system without large thermal energy loss, it is pushed only partially out of the first thermal energy storage container (5).

Abstract: Thermal energy storage system with phase change material and method of its operation An energy storage system (100) comprises a hot thermal energy storage medium (5?) and a cold thermal energy storage medium (4?), which are interconnected in a thermo-dynamic gas flow circuit. An energy converter with a motor/generator system (1A, 1B) is functionally connected to a compressor/expander system (2) for converting between electrical energy and thermal energy of the gaseous working fluid in the thermodynamic fluid circuit. A latent thermal energy storage working fluid is thermally connected to the gas flow circuit through heat exchanger (8) for providing a limit for the temperature in the cold TES medium (4?).