A method to determine a dry-out period of a converter of a wind turbine is provided. A time dependent chronology of data is measured in the converter. The measured data-chronology reflects the actual humidity and the humidity-history in the converter cabinet. The measured data-chronology is used to determine a dry-out period of time, which is needed to reduce the humidity inside the converter below a given value by circulating heat inside the converter.

A wind turbine assembly including a rotor system, a generator, a first converter, a second converter, and a controller system. The first converter includes a first bridge circuit having a plurality of switch members each having a controllable switch. The second converter includes a second bridge circuit having a plurality of switch members each having a controllable switch. The controller system is adapted to provide a drying operation for second converter including short circuiting the second converter with the controllable switches of the second bridge in circuit, and supplying power from the generator through the first converter to the short circuited second converter for drying the second converter.

A wind turbine blade having an elongated blade body extending along a longitudinal axis and having an upper skin and a lower skin, the lower skin spaced from the upper skin in a thickness direction of the blade body, the upper skin and/or lower skin having a laminated layer, the laminated layer having an outer layer wherein the outer layer forms part of the upper and/or lower skin respectively, an inner layer spaced from the outer layer in the thickness direction; and an intermediate layer sandwiched between the outer layer and inner layer, the intermediate layer having a plurality of heat transfer paths within the intermediate layer for transferring heat.

Disclosed herein are systems for controlling the amount of airflow across a radiator within an aerial vehicle radiator duct. A rigid member of a moveable flow restrictor is rotatable between an open position and a closed position. While subject to a g-force less than a threshold value in a triggering direction, the rigid member is oriented in the open position and, while subject to a g-force greater than the threshold value in the triggering direction, the rigid member is oriented in the closed position. The amount of the airflow across the radiator while the rigid member is in the open position is different than the amount of the airflow across the radiator while the rigid member is in the closed position.

A method and system are provided for cooling a heat-exchanger in a wind turbine that has an electric generator with a cooling air flow directed therethrough. Effluent cooling air flow from the electric generator is directed into an air ejector pump and acts as motive air through the air ejector pump. Cold air is drawn into the air ejector pump by the vacuum generated by the motive air moving through the air ejector pump. The heat exchanger is disposed in-line with the cold air flow so that the cold air is drawn through the heat-exchanger, removes heat from the fluid circulated through the heat-exchanger, and becomes heated air that is combined with the motive air and discharged from the nacelle.

A self-orienting gas evading intake for a submersible pump provides an efficient, reliable and inexpensive system for pumping a downhole fluid to a surface. An intake section of a submersible pumping system may comprise a blocker sleeve disposed between an external housing and an eccentric intake. The intake section may be self-orienting such that a gas component of the fluid ascends the borehole to separate from a liquid component of the fluid. Actuation of a blocker sleeve exposes one or more ports of the external housing while blocking one or more other ports. The liquid component is drawn into the intake section through an exposed port and through one or more openings of the eccentric intake. The liquid component may then be drawn into the pump. As the liquid component comprises non-detrimental amounts, if any, of a gas component, the pump operates efficiently and effectively.

A power generating roof ventilation device for venting a structure and generating an electrical current includes a tube, which is mountable to a roof of a structure so that the tube is in fluidic communication with an interior space of the structure. The tube extends from the roof. A generator is engaged to and is positioned within the tube so that a drive shaft of the generator extends from the tube. A plurality of blades is engaged to the drive shaft. The blades extract energy from air passing over the blades. The drive shaft is rotated and an electrical current is generated by the generator. Simultaneously, air is extracted from the interior space of the structure.

A wind turbine including: a pressure supply system for operating the actuator of at least an aerodynamic device by means of a pressurized gas, wherein the pressure supply system includes: a pressure generator for pressurizing the pressurized gas, a pressure supply line connecting the pressure generator and the pneumatic actuator for providing the pressurized gas to the pneumatic actuator, the pressure supply line including a pressure reservoir, a return line connecting the pressure generator and the pneumatic actuator for returning the pressurized gas to the pressure generator, the return line including a return reservoir having a negative relative pressure, is provided.

The present disclosure relates to fastener assemblies (400) for a wind turbine blade (22) to rotor hub (20) connection, wherein the fastener assembly (400) comprises a fastener (401) and one or more sleeves (410) configured to absorb the ingress of liquid into a blade root insert (220). The present disclosure also relates to wind turbine hub assemblies (1000) and associated methods (700).

A machine and process to compress ambient air using natural swell of ocean waves to store energy. The devise is a bi-directional air pump operated by ocean wave power of water buoyancy as well as earth gravity in a pressure vessel using a piston. The machine uses a large surface area as float connected by a rod to a small area as piston, housed in a pressure vessel to multiply compression of air. The compression of air is directly proportional to the respective surface areas of float to the piston attached with a rod inside the pressure vessel. An array of similar machines can be employed to multiply potential energy output.