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Provided is a wind turbine generator system that can cool a nacelle interior by ventilation irrespective of the outside air temperature in various installation environments. In a wind turbine generator system in which equipment of drive and electricity generation mechanisms that are coupled to a rot

Provided is a wind turbine generator system that can cool a nacelle interior by ventilation irrespective of the outside air temperature in various installation environments. In a wind turbine generator system in which equipment of drive and electricity generation mechanisms that are coupled to a rotor head provided with wind turbine blades is disposed inside a nacelle, and in which, by driving a ventilation fan provided in the nacelle, outside air introduced from an air inlet provided in a front face of the nacelle is exhausted outside the nacelle from an air outlet that communicates with a fan outlet, to perform ventilation cooling of the interior, a side air inlet is additionally provided in a side face of the nacelle at a position where a negative pressure is generated by air flowing outside the nacelle.

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1. A wind turbine generator system comprising: a rotor head provided with wind turbine blades;equipment of a drive mechanism and an electricity generation mechanism that are coupled to the rotor head;a nacelle in which the equipment is disposed;an air inlet provided in a front face of the nacelle;an

1. A wind turbine generator system comprising: a rotor head provided with wind turbine blades;equipment of a drive mechanism and an electricity generation mechanism that are coupled to the rotor head;a nacelle in which the equipment is disposed;an air inlet provided in a front face of the nacelle;an air outlet provided on the nacelle;a ventilation fan provided in the nacelle and having a fan outlet communicated with the air outlet to exhaust air introduced from the air inlet through the air outlet to an outside of the nacelle, to perform ventilation cooling of the equipment;a side air inlet provided in a side face of the nacelle at a position where a negative pressure is generated by air flowing outside the nacelle;a rearward side air inlet provided in the side face of the nacelle at a position that is located rearward of the nacelle with respect to the side air inlet and where the negative pressure is eliminated; andswitching means for selecting an open or closed state of the side air inlet and the rearward side air inlet. 2. The wind turbine generator system according to claim 1, wherein the rearward side air inlet is positioned at an upper rearward portion of the side face of the nacelle. 3. The wind turbine generator system according to claim 1, wherein the switching means is provided with a front supported swing member that is attached to the side air inlet and is openable outward toward the rear side of the nacelle by using a front portion of the side face of the nacelle as a fulcrum and a rear supported swing member that is attached to the rearward side air inlet and is openable outward toward the front side of the nacelle using a rear portion of the side face of the nacelle as a fulcrum. 4. The wind turbine generator system according to claim 1, comprising a front hood member that is attached to the outside of the side air inlet and that is closed at the nacelle front side and opened toward the nacelle rear side and a rear hood member that is attached to the outside of the rearward side air inlet and that is opened toward the nacelle front side and closed at the nacelle rear side. 5. The wind turbine generator system according to claim 1, wherein the air inlet includes a louver having a cross-sectional channel shape in which an inlet opening area at an outflow side is larger than that at an inflow side. 6. The wind turbine generator system according to claim 1, wherein the air inlet includes a louver having a cross-sectional channel shape in which an inlet opening area at an outflow side is larger than that at an inflow side. 7. The wind turbine generator system according to claim 1, wherein, when a longitudinal length of the nacelle is defined as L and the length from the front face of the nacelle to a central axis of the side inlet in a longitudinal direction of the nacelle is defined as a, the side inlet is disposed such that a=0.1 L˜0.3 L. 8. The wind turbine generator system according to claim 1, wherein, when a longitudinal length of the nacelle is defined as L and the length from the front face of the nacelle to a central axis of the side inlet in a longitudinal direction of the nacelle is defined as a, the side inlet is disposed such that a=0.1 L˜0.3 L, andwhen the length from the front face of the nacelle to a central axis of the rearward side inlet in the longitudinal direction of the nacelle is defined as b, the rearward side inlet is disposed such that b=0.5 L˜0.8 L. 9. The wind turbine generator system according to claim 2, wherein the air inlet includes a louver having a cross-sectional channel shape in which an inlet opening area at an outflow side is larger than that at an inflow side. 10. The wind turbine generator system according to claim 3, wherein the air inlet includes a louver having a cross-sectional channel shape in which an inlet opening area at an outflow side is larger than that at an inflow side. 11. The wind turbine generator system according to claim 4, wherein the air inlet includes a louver having a cross-sectional channel shape in which an inlet opening area at an outflow side is larger than that at an inflow side. 12. The wind turbine generator system according to claim 5, wherein the cross-sectional channel shape inclines such that a center line of the cross-sectional channel shape descends from the inflow side to the outflow side, and a wall forming the channel cross-section is provided with a gutter at a lower portion thereof. 13. The wind turbine generator system according to claim 7, wherein the entirety of the side inlet is disposed within a range of 0.1 L˜0.3 L. 14. A wind turbine generator system, comprising: a rotor head provided with wind turbine blades;equipment of a drive mechanism and an electricity generation mechanism that are coupled to the rotor head;a nacelle in which the equipment is disposed and which includes a front face behind the rotor head,a top face facing the sky,a bottom face facing the ground, anda side face connecting the top and bottom faces and extending rearwardly from the front face;an air inlet provided through the front face of the nacelle;an air outlet provided on the nacelle;a ventilation fan provided in the nacelle and having a fan outlet communicated with the air outlet to exhaust air introduced from the air inlet through the air outlet to an outside of the nacelle, to perform ventilation cooling of the equipment; anda side air inlet provided through the side face of the nacelle in a negative-pressure region where a flow direction of an air flow outside the nacelle rearwardly from the rotor head is changed by being affected by edges of the front face of the nacelle such that the air flow is separated from the side face of the nacelle to generate a negative pressure. 15. The wind turbine generator system according to claim 14, wherein when the ventilation fan is not in operation, the negative pressure in the negative-pressure region is more negative than a pressure inside the nacelle, thereby causing the air inside the nacelle to exhausted through the side air inlet, andthe ventilation fan is arranged to, in operation, create a negative pressure more negative than the negative pressure in the negative-pressure region, thereby causing the air outside the nacelle to enter the nacelle through the side air inlet. 16. The wind turbine generator system according to claim 15, wherein the side air inlet is positioned adjacent to and rearward of the air inlet to, when the ventilation fan is not in operation, enable air entering the nacelle through the air inlet to directly flow out from the side air inlet without circulating inside the nacelle. 17. The wind turbine generator system according to claim 14, wherein the air inlet and the side air inlet are co-elevational.