large wind turbine
large wind turbine
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 NEW Large Wind Turbines - Harrison, Robert/ Hau, Eri... US $379.95 
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large wind turbine Frequently Asked Questions
which is more efficient small or large wind turbine?
I have a question for my assignment. I wanted to find out which turbine(small or large) was the most efficient at generating electricity. I carried out a experiment and found that large wind turbine produced more electricity at low wind speed and the small wind turbine produced more electricity but at higher wind speed. Which is better and why?
Hey Shalom, good day to you. Your question is not really answerable as it is written. From the standpoint of efficiency, fewer blades does translate to better efficiency, meaning how much energy you can extract from a given wind and swept area, I'll explain in a moment. Mike is correct that there is no one design that is best, whether you're speaking of cost per unit power, power per unit wind, man-hours of maintenance per unit power and so on. If there were one best design, all windmills would be the same. They aren't, and there's a very good reason. Mad Max is correct also, the utility sized turbines use less material per unit power output. The other advantage to them is you need fewer people to maintain them per unit power they put out, this is what really endures them to utility companies. They do cost more in terms of purchase price for manufacturing, shipping and installation, but once you have one of those beasts running, they look very good on the balance sheet for years to come.
When people in the wind business talk of efficiency, they are referring to amount of power you can extract from a given wind speed and swept area of the blades. The short answer is the most efficient wind turbine design is the horizontal axis single blade turbine. Most people have never heard of or seen one in North America, they were common years ago in many parts of Europe where the winds were very light, and so efficiency was a chief concern. The single blade extended only in one direction away from the hub, and on the opposite side was a large bowling ball shaped counter weight. The reason this type is most efficient is that the one airfoil has complete use of the passing air. When you add a second blade, you can capture the wind twice as often, but the combination of two blades to swing through the air creating drag, and the turbulence left behind from one blade interferes with the second one in its path, much like a boat leaving a wake behind for another one to pass through. The next most efficient design is the 2 blade, but it is nearly as efficient as the single blade, better for slightly higher and less steady winds. They work best in areas where the wind blows mainly in one direction all day and the rotor head does not have to change direction often. When you are in a situation where the wind changes direction frequently, like the upper midwest, the three blade units are the best, because no matter what orientation the blades are in, the gyroscopic moment on the tower is steady while the unit is turning to a different direction. This is the main reason the 3 blade units are so common in North America. The 5 or 10 percent loss in efficiency is more than offset by the longer longevity of the tower and equipment, they run much smoother. Once you get beyond the 3 blades, additional blades do not offer any additional advantages, but each additional blade costs a bit more in efficiency losses. For this reason, most wind turbine manufacturers today primarily make 3 blade units. There are a few 2 blade units out there, Southwest windpower has one I believe for home use. There are also a few very small units for remote applications with 6 or 8 blades, but these are made purely for extremely high wind applications, like an artic weather station or onboard an ocean going vessel.
The two people who are considered the gurus on this subject are Mick Sagrillo and Paul Gipe. Paul has written a book called, "Wind Power for Home and Business," and Mick has authored several papers and articles and written several books on renewable energy as well, and continues to teach workshops in Wisconsin on the subject. We were fortunate enough to go to one of his classes at the Midwest Renewable Energy Fair several years ago. I would suggest looking for Paul's book at the library, or anything by Mick, or surfing to one of the websites below, it's all very interesting reading, and you'll be getting better information on the subject this way. Hope this helps, take care, Rudydoo
wind turbines grid tie wattage?
i want to use a plug-in grid tie inverter. i'm seeing 250w ones on ebay. i'm not even sure they work as stated, if anyone has one i'd love to hear from you. my real question is, can you use a more poweful wind turbine like say 750w with this 250w inverter or would that damage it. reason is, if this plug-in inverter actually works, i would like to buy more and piggyback them, that's the reason for using the larger turbine. thank you.
No you have to match the inverter with the power it will see.
No, you can't piggyback them.
yes, you have to get permission from the utility company to do this. Some say NO, under no circumstances, others allow only equipment that they supply, others allow only equipment they approve. In most cases they require the installation be done by an electrician they approve.
Note that you may need a battery and a charge controller also. Inverters need to see a fairly constant 12v or 24v, which many wind turbines will not provide.
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