Abstract: The invention concerns a centrifugal filtering device for filtering a fluid. The device comprises a rotatable inner casing forming an inner space and a rotatable outer casing forming an outer space. The device further comprises a fluid inlet, at least one filter and drive means. The drive means is configured to rotate the inner casing to create a centrifugal pressure. The pressure forces a part of the fluid contained in the inner space through the filter and to a radially outer position of the outer space. The filtered fluid forms a filtrate, the filtrate having a kinetic energy. The outer casing is configured to transport the filtrate from the radially outer position to a radially inner position of the outer space, permitting transfer of the kinetic energy from the filtrate to the outer casing, thereby permitting regaining of mechanical energy.

Abstract: A hydropower device for generating electric power comprises a pipe having an upstream portion and a downstream portion and being arranged to convey water. A valve is provided at the downstream portion and adjustable between a closed position hindering the water and an open position permitting the water to flow. A cylinder member defines an inner space and having a first end and a second end. The inner space extends away from the pipe along a centre axis (x) and receives water from the pipe via the first end when the valve is in the closed position. A piston is disposed in the inner space and movable back and forth along the centre axis. The piston moves away from the pipe by means of an overpressure arising when the valve is in the closed position.

Abstract: The invention concerns a centrifugal filtering device for filtering a fluid. The device comprises a rotatable inner casing forming an inner space and a rotatable outer casing forming an outer space. The device further comprises a fluid inlet, at least one filter and drive means. The drive means is configured to rotate the inner casing to create a centrifugal pressure. The pressure forces a part of the fluid contained in the inner space through the filter and to a radially outer position of the outer space. The filtered fluid forms a filtrate, the filtrate having a kinetic energy. The outer casing is configured to transport the filtrate from the radially outer position to a radially inner position of the outer space, permitting transfer of the kinetic energy from the filtrate to the outer casing, thereby permitting regaining of mechanical energy.

Abstract: A hydropower device for generating electric power comprises a pipe having an upstream portion and a downstream portion and being arranged to convey water. A valve is provided at the downstream portion and adjustable between a closed position hindering the water and an open position permitting the water to flow. A cylinder member defines an inner space and having a first end and a second end. The inner space extends away from the pipe along a centre axis (x) and receives water from the pipe via the first end when the valve is in the closed position. A piston is disposed in the inner space and movable back and forth along the centre axis. The piston moves away from the pipe by means of an overpressure arising when the valve is in the closed position.

Abstract: The present invention is a device and a method for protecting part of a coastline against erosion. The method uses the device as an elongated fin with a longitudinal axis lying generally in a horizontal plane. The fin is supported by a suspension arrangement so that it can swing in the horizontal plane. Adjusting the longitudinal axis of the fin, in the horizontal plane, causes the fin to deflect from the water flow a component that counteracts with a generally coast-parallel water flow component. This component originates from the water flow and/or from a wave that is not parallel with the coastline. The fin is carried by a suspension arrangement which enables the fin to swing in the horizontal plane. The suspension arrangement is constructed to increase the fin angle relative to the coastline when the direction of the waves relative to the coastline increases, and to decrease the fin angle relative to the coastline when the direction of the waves relative to the coastline decreases.