Frequent Q & A

How much energy will an ArborWind turbine produce?

Energy production is a site specific question but the dominant factor is wind speed. The power within wind is not linear to the wind speed but rather it is speed to the third power. Thus a locale with twice the average wind speed will typically produce approximately eight times the power. The PT180 by ArborWind is estimated to produce 180,000 kWhr per year when the average wind speed at a given site is 7 meters/second (15.7 mph).

Is an ArborWind vertical axis wind turbine (VAWT) friendlier for birds?

 The ArborWind PT180 VAWT, although fairly sizeable, is significantly more favorable to bird wildlife. Birds actually look downward and a vertically configured blade greatly increases its visibility. The bird therefore can avoid collision. An ArborWind turbine blade velocity is typically much slower at standard wind operating speeds. ArborWind has received endorsement from the Audubon Society for its design configuration.

How noisy is the ArborWind PT180?

ArborWind turbines change rotational velocity as the wind increases. So at lower speeds, the blade velocity is lower and noise is not noticeable, especially when compared to a traditional horizontal axis turbine. At high wind speeds, the noise increases but so does the background wind noise. At ground level, the noise is kept well below 45dB sound level even at the highest rotational speeds.

Why are wind turbines placed on high towers to be most successful?

There are fundamentally two reasons for wind turbines on towers. First is wind speed typically increases with height and therefore there is significantly greater access to higher energy output. The second is wind nearer ground, structures, and or a tree has more turbulence which reduces airfoil blade effectiveness. Although ArborWind’s VAWT is less susceptible to turbulent impacts than standard HAWT’s, it remains something to avoid if the goal is to maximize power and hence energy production.