Introducing Reinventing Fire.. with Amory Lovins

[indiage]

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[kelekokerupuk]

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[tresenglish]

I believe the horizontal wind turbine is more efficient when the wind speed is high and from a relatively constant direction. The vertical-axis systems will produce more power if the directions change rapidly, like an urban area.

[JBC814]

One question (which I doubt you'll answer): Why is the inefficient propeller windmill used instead of the vertical-axis windmill? The prop windmill is dangerous (top heavy), hard to maintain, kills birds, and needs much more wind to produce power. The vertical-axis windmill has none of those problems, and is much safer. It's a no brainer. For what possible reason would they not use the vertical-axis windmill?

[RockyMtnInstitute]

@JBC814

Vertical Axis Wind Turbines (VAWTs) are very difficult to mount on a tower and are typically mounted on a base, resulting in less wind speed that the turbine is able to harness, which translates to lower energy production than Horizontal AWTs. In addition, most VAWTs require external power to start-up due to their low starting torque. Lastly, VAWTs suffer from the inefficiency of having to drag each blade back through the wind every rotation

[JBC814]

@RockyMtnInstitute : You could mount the VAWT's at the top of a hill or mountain. Have you seen the latest developments? I think sauerpower(dot)com has a lot of potential. Also, you could shroud half of the impeller so it wouldn't face the wind, and install a funnel on the other half. It would need a big tail-fin or vane to allow it to follow wind direction also. In any case, the top-mounted generator is absurd no matter what your reasoning is, and the props kill birds.