A wind turbine rotor blade, with a length, a rotor blade root, a rotor blade tip, a pressure side, a suction side, a leading edge, a trailing edge, and an air guide for heated air to guide heated air inside of the rotor blade and along a longitudinal direction of the rotor blade from the rotor blade root in the direction of the rotor blade tip. The wind turbine rotor blade additionally comprises at least one aerodynamic mixer in the area of the air guide. The invention further relates to a wind turbine with at least one wind turbine rotor blade.

The invention relates to a wind turbine rotor blade with a length, a rotor blade root, a rotor blade tip, a pressure side, a suction side, a leading edge, a trailing edge and an air guide for heated air for guiding heated air inside of the rotor blade and along a longitudinal direction of the rotor blade from the rotor blade root in the direction of the rotor blade tip. The wind turbine rotor blade also comprises at least two air guide sections and at least one heat exchanger for conveying heat from one air guide section to another air guide section.

Wind turbine ice protection systems and methods are provided. An ice protection system for heating a wind turbine blade includes: a heater disposed in an interior of the wind turbine blade, the heater for heating air; a blower disposed in the interior of the wind turbine blade and for moving the air across the heater to generate a heated airflow; a duct disposed in the interior of the wind turbine blade, the duct for receiving the heated airflow and releasing the heated airflow into the interior of the wind turbine blade; and an electrical control subsystem disposed in the wind turbine for controlling one or more components of the ice protection system.

A method for operating a wind turbine is disclosed, wherein said wind turbine comprises a rotor having at least one rotor blade with a rotor blade surface and an icing detection device for detecting an icing condition for the rotor blade and/or for detecting the presence of icing on the rotor blade. Further, a controller configured for controlling a rotational speed of the rotor can be provided. The method comprises the steps of monitoring, via the controller and/or via the icing detection device, whether an icing condition for the rotor blade is present and/or if icing on the surface of the wind turbine is present, thus, that ice has been generated on the surface. If an icing condition is detected, or if it is detected that ice has generated on the surface of the rotor blade, the wind turbine is operated further according to a de-rated icing-mode having a reduced rotational speed, in particular while maintaining a generation of electrical energy by a generator of the wind turbine.