Patent ID: 8632303

Claim:
A wind turbine generator comprising: a tower; at least one blade; a hub which supports the at least one blade; a main shaft connected to the hub; a nacelle which is supported by the tower and has a duct part having an intake port and an exhaust port, the duct part being integrally-formed on a wall of the nacelle; and a heat exchanger which is provided in the duct part and cools a cooling medium having cooled a heat-producing component inside at least one of the tower and the nacelle by heat exchange with an ambient air introduced into the duct part through the intake port, wherein the nacelle includes a nacelle interior which is formed with a space inside the nacelle surrounded with a top surface, side surfaces, and a bottom surface of the nacelle, wherein, in an area where the duct part is provided, the wall of the nacelle has a double wall structure constituted of: an inner wall at least partially demarcating the nacelle interior from an outside of the nacelle interior, and an outer wall arranged outside the nacelle interior to cover at least a portion of an outer surface of the inner wall, wherein the inner wall of the nacelle forms a bottom surface of the duct part and has a curved portion which curves inward toward a center line of the nacelle with increasing distance from the hub, and wherein the duct part increases in cross-section from a side of the intake port to a side of the exhaust port at least in an area where the curved portion is formed.