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Hollow Friends
In this Article Published in the Home Power Magazine Issue 158 Page’s 62 through 68. This article explains how a Turbine should be installed. When you read this article full of good info for those looking to buy and install a Wind Turbine, you will see it never says anything about installing on a roof. We never say you can’t, but realize you will not see the same results as you would if you install it at the proper height as stated in this article. So please read and learn before you buy.

Article Written by, Mick Sagrillo

Original Article Can be found here   Home Power

Wind Matters

 

1_Intro.fxd_The number and variety of wind turbine designs available has never been greater. With so many choices, it seems like we should be seeing all manner of wind turbines busily spinning and generating electricity. Yet too many sit idle—generating little, if any, electricity. That’s because a wind-electric system must encompass much more than just the turbine.

     Besides a turbine (aka wind generator), you’ll need an adequate wind resource, a properly sized tower, a suitable site, and the wherewithal to maintain and watch over the system.

Swept Area Matters
     A wind turbine’s blades are fixed to a hub. Together, they make up the rotor. The rotor turns in the wind, converting the kinetic energy in moving air (wind) into rotational momentum to spin an electrical generator. The rotor is the collector for a wind turbine, harvesting wind energy, which is then converted into electricity by the generator.

     Hundreds of different rotor designs have been invented, tried, and discarded over the past eight decades. Regardless, there are still all sorts of claims about unprecedented efficiencies of various new turbine designs. So how can you sort out fact from fiction?

swept area matters

     Let’s use a simple analogy to explain the concept of the rotor as a collector, using a solar hot water collector. A 4- by 8-foot collector is capable of collecting a certain amount of sunlight and converting that sunshine into a certain amount of hot water. If we double the size of the collector, it makes sense that the system would now be able to collect twice the sunlight and generate twice as much hot water.

     The bigger the renewable energy collector, the more energy it is exposed to that can be collected—and the more output the system will generate. The area of the wind that the rotor intercepts is called the swept area. Just as with solar collectors, increasing the swept area of the rotor increases the amount of wind the turbine can intercept and convert (to electricity). There is no circumventing this concept; it’s just simple mathematics. Doubling the diameter of the rotor results in a four-fold increase in the swept area—and potentially four times the electricity for any given wind speed.

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