Rotor blade of a wind turbine

Rotor blade for a wind turbine, with - two in the longitudinal direction of the rotor blade (10) extending partition walls (18, 20) which open at its ends center channel (16) and an open at its ends nose edge channel (28), wherein the central channel (16) and the nose edge channel ( 28) are interconnected at their ends, - generates a blower device (30) an air stream (40) through the central channel (16), wherein the air current (40) in the rotor blade via the central channel (16) and the nose edge channel (28) circulates, and - at least one heating device (38) of the circulating air stream (40) flows around and this heated, wherein the heating means (38) separate from the fan means (30) in a blade tip side portion of the central channel (16) is disposed whose cross-section compared to tapering the cross-section of the central channel (16) in the blade root.