Wind turbine cooling technologies - Wind Power Generation and Wind Turbine Design - page 638

Figure 16: Schematic diagram of the wind turbine system adopting heat pipe
cooling gearbox: 1, saddle piece; 2, impeller blade; 3, low-speed shaft;
4, gearbox; 5, lubricating oil; 6, gravity heat pipe; 10, temperature con-
troller; 11, electric heater; 12, high-speed shaft; 13, control converter;
14, generator; 15, nacelle cover.
Figure 17: Schematic diagram of gravity heat pipe: 7, working substance; 8,
shell of pipe; 9, radiating rib; a, evaporation zone; b, insulation zone;
c, condensation zone.
temperature controller and an electric heater aiming at preventing extreme cold of
the lubricating oil in winter. During the operation of the wind turbine, the heat
produced by the gearbox is fi rstly absorbed by lubricating oil, and then delivered
to the evaporation zone of the heat pipe. The working substance in the heat pipe
evaporates because of heat absorption. The vapor ascends in the axial direction
along the heat pipe, passing the thermal insulation zone, and then releases heat and