An energy conversion system for converting wind energy into electrical energy includes at least one rotor having a substantially horizontal rotational axis and a plurality of rotor blades extending radially with respect to the rotational axis; a rotor mantle which fully surrounds the rotor; a plurality of wind funnels, including a first wind funnel arranged upstream of the rotor mantle and tapering towards the rotor mantle, and a second wind funnel arranged downstream of the rotor mantle and widening in a direction leading away from the rotor mantle; and a fixed frame which supports the rotor mantle and/or the plurality of wind funnels, wherein at least one adjustment device is provided, which is arranged and configured to orient the energy conversion system in a position corresponding to a prevailing wind direction.

The present invention provides a suction cover device for a kinetic tidal power plant, comprising: a flow inlet opening and a flow outlet opening arranged along a flow direction downstream of the flow inlet opening and a plurality of cover housing segments which extend between the flow inlet opening and the flow outlet opening substantially in the flow direction and are provided such that the plurality of cover housing segments collectively form a conically shaped cover body, wherein the plurality of cover housing segments are continuously movable relative to one another between a first extreme position and a second extreme position such that the flow velocity inside the suction cover device can be controlled compared to the surrounding flow.

A wind machine with aerodynamic elements to concentrate and accelerate an wind flow entering from outside, said machine having a housing, with an air intake, a first section converging up to an element having a substantially spherical or cylindrical section, a second and a third section, downwind said first converging section, each of said first section, said second section and said third section causing said wind flow to contact said element which has a substantially spherical or cylindrical section substantially up to its median line, a first and a second auxiliary air intake, coincident with said median line of said element having a substantially spherical or cylindrical section, said element having a substantially linear portion, being downwind of said first and second air intakes, and having a fourth and fifth section after said third section.