Abstract: A serrated panel is for a trailing edge of a wind turbine rotor blade. The serrated panel includes a plurality of teeth, each tooth having a tip, a base, two edges running from the tip to the base, a longitudinal axis, a pressure side surface and a suction side surface, and a plurality of vanes arranged side by side with a gap between adjacent vanes, each vane beginning at one of the edges and extending in a rearward direction. Each vane has a vane length, a vane width and a vane height. The pressure side surfaces and/or the suction side surfaces of the teeth include wave elements beginning at or near one of the edges and extending in a forward direction. Each wave element has a crest which is aligned with one of the vanes and a wave element width which is larger than the vane width.

Abstract: A wind turbine rotor blade having a root section includes a blade root, an outer end and a root section length, a main section having an inner end, an outer end and a main section length, a tip section having an inner end, a blade tip and a tip section length. The outer end of the root section and the inner end of the main section are configured to be connected to one another. The outer end of the main section and the inner end of the tip section each have a cross section shaped as an aerodynamic profile and are configured to be connected to one another. The outer end of the root section and the inner end of the main section have a circular cross section.

Abstract: A heating element for an outer surface of a wind turbine rotor blade, wherein the heating element has a length and a width. The heating element includes a carbon fiber layer having a plurality of slots subdividing the carbon fiber layer into consecutive band sections defining a current path between a first connecting portion and a second connecting portion. The first connecting portion is adapted to be connected to a first power supply line and the second connecting portion is adapted to be connected to a second power supply line. The current path has a length of at least twice the length of the heating element.

Abstract: A heating element for an outer surface of a wind turbine rotor blade, wherein the heating element has a length and a width. The heating element includes a carbon fiber layer having a plurality of slots subdividing the carbon fiber layer into consecutive band sections defining a current path between a first connecting portion and a second connecting portion. The first connecting portion is adapted to be connected to a first power supply line and the second connecting portion is adapted to be connected to a second power supply line. The current path has a length of at least twice the length of the heating element.