VAWT
Vertical Axis Wind Turbines (VAWTs) have been used in urban areas for lighting, home powering, large outdoor billboards, telecon stations, oil fields, wind energy buildings, highway monitoring systems, etc. VAWTs are recognized as energy conversion efficiency, noise-free, safe, reliable and little maintenance.
VAWT categorizes in various shapes and sizes due to design concepts and manufacturing capabilities. Comparing to traditional Horizontal Axis Wind Turbine (HAWT), VAWT has unique advantages that make it more efficient in power generation. There are currently two types of VAWT in the wind turbine market. First, the Drag-type VAWT, also referred as Savonius or S-shape VAWT. The advantage of Savonius VAWT is its larger starting torque, but a drawback is vibrating badly and low power efficiency during rotation due to sideway push produced by the asymmetric airflow. Based on calculation, the wind utilization rate for Savonius VAWT is lower than 2/27, which is very low efficiency on energy conversion. In comparison, the Lift-type VAWT use the lift of the airflow to rotate, the blades are based on aerofoil theory design while driving torque is created by resultant force when the air flows across the blades. Darrieus and H-shape are typical Lift-type VAWTs. Darrieus turbines only have two or three blades, the advantage of Darrieus is low costs due to simpler design structure with no supporting tower needed, but they require external force to get started, and must shut down under gusty winds for safety reasons.
Among all H-shape VAWTs, the best design is the straight-shape blade design model. Due to self-start capability, a minimum of 4 blades are required, 3 or less blade models are not recommended due to extensive number of “dead-points” (at the position the VAWT has to use external force to get started). For a 5-blade model, the VAWT is basically “dead-points” free. Since the straight-shape blade type of VAWTs maintain air pressure inside of windmill in maximization, they have the best performance out of all other H-shape VAWTs, aerodynamically speaking.
Talos’ new designs for H-shape VAWT are monumental innovation in the wind turbine industry. Talos’ unique technologies are patented in many countries including United States.
TALOS' KEY PATENTED DESIGNS:
1) Blade Shape Perfection
2) Golden Ratio (blade wide over length)
3) Auto-adjust blade angle for most efficient power generation
4) Overspeed Regulation Structure
- Auto-adjust blade angle to reduce speed
- Overspeed auto-brake control
