WHI G168 VAWT Specifications
The G168 VAWT is a straight-bladed, H-type vertical axis wind turbine, which has evolved from earlier versions produced by Wind Harvest International and directly from the G168 prototype, which was field-tested and modeled at the Nordic Folkecenter for Renewable Energy.
The G168 prototype at the Nordic Folkecenter in Denmark operating at 65 rpm in 14m/s (31mph) winds undergoing mechanical braking in the last 25 seconds of the video.
The G168 has three aircraft aluminum blades, each 14 m (46’) long, and three sets of horizontal arms with a rotor diameter of 12 m (39’). The G168 is cantilevered from the ground through two sets of radial thrust bearings and one set of axial load bearings resulting in a blade tip height of 18 m (59’) with a standard tower.
The rotor drives a gearbox driven synchronous generator in conjunction with a power converter that allows for variable speed operation. It has a redundant, fail-safe braking system using a resistor and a pair of spring-loaded caliper brakes as well as a regenerative electrical brake for stopping under normal operations.
Using strain gauges and other instrumentation on the G168 prototype that was tested at the Nordic Folkecenter in Denmark, sufficient data was secured to validate the aeroelastic modeling used to perfect the G168 VAWT. Now, the production turbine is contracted for manufacturing with a leading Texas based manufacturer and planned for installation and certification at the UL Advanced Wind Turbine Testing Facility in Texas this fall.
The G168 is designed to operate in IEC Wind Turbine Class II winds and withstand 50-year extreme wind speeds of 59.5m/s (133 mph). It has a total weight of 12,000 kg (26,500 lbs) and a design life of 25+ years with the blades and the core of the turbine capable of lasting significantly longer.
G168 Power Performance and Energy Output*
Annual Energy Production
* Predicted based on modeling of Coupled Vortex Effect and power performance in a Rayleigh Distribution wind resource at sea level.