A de-icing system for a wind turbine blade

A wind turbine blade (10) having a blade de-icing system, the wind turbine blade comprising a root end (16) and a tip end (14), a leading edge (18) and a trailing edge (20), the blade having an outboard portion provided towards said tip (14) end and an inboard portion provided towards said root end (16), the blade de-icing system arranged to convey a heated fluid to provide heat to portions of the wind turbine blade, wherein the blade de-icing system comprises:

• an insulated outflow channel (70) flowing from said root (16) end to a location adjacent said tip (14) end;
• a heating channel (72) in the outboard portion of the blade, the heating channel flowing from said location adjacent said tip end (14) along the leading edge (18) of the blade in the outboard portion of blade;
• and
• an insulated return channel (78) in the inboard portion of the blade, the insulated return channel (78) extending from the root end side of the heating channel to the root end of the blade,
• wherein said de-icing system is arranged to convey heated fluid from said root end (16) through said outflow channel (70) to said tip end (14), from said tip end (14) through said heating channel (72) to said insulated return channel (78), and from said insulated return channel (78) to said root end (16), said de-icing system configured to heat the leading edge (18) of the blade in said outboard portion of the blade.