Talk:Wind turbine design

1608:

a clear view of part of a 6x1.8 MW farm, with apparently some form of synchronous generator, as the rotational speed is constant, no matter the wind speed. What intrigues me is that they often rotate with zero wind speed which suggests to me that either the generator acts as a motor or there must be a small motor to keep it turning in synchronism. I presume that the reason for this that the energy consumed in idling must be less than the energy needed to overcome the inertia of starting the blades from a standstill to working speed when the wind re-starts, so that if the average windspeed reaches the generation threshold of ~3.5 m/s, it can start producing immediately rather than wait until the blades reach synchronisation speed. This must consume quite some energy from the grid and this is never mentioned in the production figures. I feel that the article should contain some mention of wind turbine consumption. Unfortunately I do not feel competent to edit it myself.

956:(n): ω = 120f/n. When used as a motor, it runs at less than that speed. The difference is usually called slip. As slip increases, the motor will produce more and more torque till the maximum is reached. If connected to a load, the motor will then stall. When used as a generator, it must be driven at a speed greater than the synchronous speed. As with use as a motor (but in reverse), the power produced increases as the slip increases until it reaches a peak. If that slip rate is exceed, the generator will produce less power. If slip continues to increase, a point will be reached where no power is produced and if that slip is exceeded, it will start absorbing power from the grid. 1646:- there could be other references but I didn't have the time to seek them. I have made a deep study of the meteorological conditions in this region and roughly half the days (outside a few winter gale periods), my anemometer (at 22 m above ground level and approximately at hub level of the nearest turbine which is on lower ground) registers average daily wind speeds of <1 m/s. It often registers 0 m/s for hours on end in still anticyclonic conditions with isobar maps showing zero pressure gradient, yet the blades still turn. The 1057: 487:

that something is wrong here. Obviously, raising the turbine height from 50m to 70m can't give a 1000 fold increase in power. The 30MW figure might be the states current output capacity (although NRELs 2007 report doesn't even provide a figure for Indiana). The 40,000 MW figure might represent a theoretical maximum output capacity but the citation doesn't provide a link to the actual NREL data. Either way, it is at best very confusing and at worst completely wrong.

1029: 451:? That sounds like it could keep the energy from being wasted as heat and instead captured and trickled off slowly, still providing the needed braking and giving a boost to the turbine's efficiency and output. Only when the capacitors were topped out (and a great deal of capacitance could be used if wanted) would a resistor be used. Or am I misunderstanding how this works and this is not technically possible? 151: 67: 49: 77: 514:. However the durability (in years) or needed maintenance of the blades, the (steel) tower, or the internal parts is not discussed, but this information would be most welcome. (Any evaluation or cited experiences of the durability/maintenance would be turbine-type specific, so in my understanding this page would be the right place, instead of the more general "Wind turbine" page.) ( 22: 628:"Increasing the number of blades from one to two yields a six percent increase in aerodynamic efficiency, whereas increasing the blade count from two to three yields only an additional three percent in efficiency. Further increasing the blade count yields minimal improvements in aerodynamic efficiency and sacrifices too much in blade stiffness as the blades become thinner." 398: 1927:. When requesting whitelisting, be sure to supply the link to be whitelisted and wrap the link in nowiki tags. The whitelisting process can take its time so once a request has been filled out, you may set the invisible parameter on the tag to true. Please be aware that the bot will replace removed tags, and will remove misplaced tags regularly. 329:

Pressure Side in order to fix the Laminar-Turbulent transition location and allow the tripped (i.e. turbulent) boundary layer to attach to the rear part of the pressure side of the airfoil. If this part is cambered (i.e. S shaped trailing edge) then the fact that the BL is attached will lead to a lift increase due to the trailing edge camber.

1502:

mains power), induction directly connected to mains (they generate power only when they are spinning faster than their synchronous RPM). My understanding is that the induction-type is the only one of the 3 where it makes sense to try to maintain a fixed speed adjusting the blade pitch, which is what I thought we were talking about. --

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Which 1.8 MW Turbine has a constant rotor speed? In the beginning of wind power usage a lot of turbines had such technique, but nowadays not any more. It may appear, that the rotor speed is constant, but is usually is not. It doesn't make sense either, because a fixed rotor speed would cause enormous

1650:

would not indicate that 0 m/s at ground level would give 3.5 m/s at 70 m. Unfortunately, the owners of the farm are not open to discussion, hiding behind what I feel must be a loss-making venture. I cannot obtain figures for the individual farm but I do obtain country-wide wind generation figures and

1607:

Obviously, there is some consumption of electrical energy by the electronics, lights, orientation motors, hydraulic pumps (if fitted) etc. I presume the figures quoted for capacity or electricity generated are gross values. What is the average consumption of, say, a 2 MW turbine? Where I live, I have

1327:

I suppose what the original question was asking and what I don't yet understand either is why the optimums seem to be different for fans vs. turbines; now, a household fan operates in a vastly different way than a wind turbine, but it would be good to have some comprehension as to why the answers are

1305:

It comes down to aerodynamics. "The total blade area as a fraction of the total swept disc area is called the solidity, and aerodynamically there is an optimum solidity for a given tip speed; the higher the number of blades, the narrower each one must be. In practice the optimum solidity is low (only

876:

Surely if it was hard wired the wires would tangle? Some sort of slip ring to allow the transfer of power must exist, but not mentioned in the article. How about transferring the rotation of the power shaft through a crown gear - ie rotate 90 so as to be inline with the tower. then mount the genny on

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In the section on blade materials there is a piece which states : "One of the most important goals when designing larger blade systems is to keep blade weight under control. Since gravity scales as the cube of the turbine radius, loading due to gravity becomes a constraining design factor for systems

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If a three-blade turbine is good, why isn't a six-blade turbine twice as good? Is the only point of a wind turbine to turn the generator at a certain speed? Doesn't the electrical load on the turbine slow the blades down? If that was the case, one would think that twice as many blades would push the

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Among other issues, yes. Especially critical since in some sections the formulation of information is.. I'd call it haphazard. Written in a way not really meant to be understood; full of loose ends requiring additional foreknowledge. A huge pretense of complexity; and while I'm no enemy of technical

1501:

You may be right. My understanding is that practically all wind turbines are in one of those 3 types -- variable-speed (so they generate power at the mains frequency at any RPM), synchronous (as long as they are generating power, they are always spinning at some fixed synchronous RPM related to the

1290:

I still don't know the answer to this one and I've been intermittently looking for it for some time. The fluid dynamics explanations I've read so far talk about the significance of the "chord" (the width of the blades), but I haven't found an explanation I understand well enough to paraphrase here.

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generation, torque (which probably implies large blades), blade speed (which probably implies small blades), or availability (which probably implies lowering the stall windspeed, and thus blade mass and generator resistance and having variable pitch, so the turbine can generate power all the time)?

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I already took over the image myself, legally. Perhaps that the EERE_Illust_large_image may be imbedded to the image; the image I draw thus being the larger whole, and the with the EERE image as magnification of the head of the turbine (as it contains more info). The large picture has added info as

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Part of the current article says "Indiana had been rated as having a wind capacity of 30 MW, but by raising the expected turbine height from 50 m to 70 m, the wind capacity estimate was raised to 40,000 MW, and could be double that at 100 m.". The citation does indeed say this but I have to assume

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The title would invite consideration of design of any type of wind turbine, not just the towered HAWT. VAWT and other types ...belt, airborne are neglected. So, the sentence :"This article covers the design of horizontal axis wind turbines (HAWT) since the majority of commercial turbines use this

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Also utility companies rely on government subsidies to offset the cost of building wind farms which are two to three times the cost of equivalent capacity produced by coal fired units. After the subsidies run out the wind facility is normally sold to another utlity who begins to draw the subsidies

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Firstly, I do not think the term "gravity" is correct here. Gravity will not increase or decrease significantly depending on how big wind turbine blades are, it's weight may, yes but it's gravity.... I don't think so. Also, there is mention that it will increase with the cube of the radius however

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Cyberbot II has detected that page contains external links that have either been globally or locally blacklisted. Links tend to be blacklisted because they have a history of being spammed, or are highly innappropriate for Knowledge. This, however, doesn't necessarily mean it's spam, or not a good

1476:

You've been misinformed. Most energy is provided to the grid by synchronous machines, whose speed varies only in proportion to grid frequency (once synchronized). Induction machines are normaly smaller units, where the simplicity of control beats the efficiency loss. Variable-speed wind turbines

955:

As odd as this might seem, a Tesla motor/generator (so-called squirrel cage rotor) does not need to run at a constant speed. It does need to run at a narrow speed range to function as a generator. It has a synchronous speed (ω) which is a function of the AC frequency (f) and the number of poles

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Well, every type of large turbine needs pitch control - a synchronous generator (now rare) msut turn at synchronous speed and uses pitch control to regulate power output, an induction generator again needs pitch control to limit top speed, and variable-speed turbines would also need to limit top

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Ohh, finally I get it - you're taking things personally. No, that was a figure of speech, a rhetorical formulation or what have you. Not a personal comment to you, not at all. The comments were actually directed to the disembodied voice of the article text (and if you wrote that text, then sorry

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is completely wrong. First of all these is no "flat" airfoil surface, the terminology is Pressure Side and Suction Side. Then, the installation of VGs on the Pressure Side does NOT increase lift. What usually happens is that trip-stripes (i.e. zig zag tapes) are installed around mid-chord at the

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Does anyone else think that this page attempts to cover too many topics? I have noticed that the aerodynamics section contains a link to an article which explains the aerodynamics of wind turbines much better. However, the same cannot be said of other sections such as power control, generators,

1228:

I would question the statement in the current version (May 9) that the noise varies with the 5th power of the tip speed. If that were true the Vestas V47 (229 fps at nominal rotational speed) would be noisier than the Vestas V82 (202 fps at nominal rotational speed). There seems to be broad

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Could any body of you explain me how these cyclic forces vary? I am interested to know the basic mechanics of these forces for example what would be the stress level in a blade root when the blade is perpendicular to group (pointing towards ground or sky), or the stress level when a blade is

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Also, from a cursory reading of the article, I cannot figure out what are the primary, secondary, and tertiary design criteria for a windmill blade design. Thus, this article fails to address a fundamental question about turbine design. For example, what's more important to efficient power

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Well, I cannot quantify the losses. A fixed speed turbine as a lot of aerodynamic losses, because the rotor has only one (or 2) speed options and therefore operates most of the time out of its best Tip-speed ratio. On the other hand, with no electric power converters required there are less

1776:(2) If the wind suddenly stops, a typical rotor will continue to spin ("freewheel") for some time. Freewheeling generators don't generate any power, but they don't pull any power from the grid, either. How long will a rotor continue to freewheel in still air before a "noticeable" slowdown? 1428:

That would be true of machines with synchronous or induction generators; they regulate power into the grid just like a hydro turbine running at fixed speed, by adjusting their blade pitch angle to maintain the speed constant. If we don't explain this in the article, we should.

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My 81-yr old mom asks a very elementary and important question, "What was wrong with the 4-arm dutch windmills of the 1800's ?? Why do modern wind turbines have such a different shape?" We should try to address this question early in the subsection about blade shape.

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Also, what vortex generators do, is that they induce vorticity to the boundary layer thus improving the BL mixing and eventually allow the BL to "stick" to the wall (i.e. airfoil or wind turbine blade) withstanding more adverse pressure gradients. The whole statement:

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If the power-generating range was 40 RPM (synchronous speed, zero-torque, zero power) to 44 RPM (maximum torque, breakdown torque, max power), I suspect it would appear to be constant-RPM to the casual observer, and it may be reasonable to call it a "42 RPM turbine".

1805:

The section about Gearless wind turbines says "Gearless wind turbine are often heavier than gear based wind turbines." While this is true it might be good to mention that due to the missing gearbox a gearless wind mill is both lighter and require a smaller nacelle.

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Thanks for your view. I did a quick search and indeed found a reference to motoring, albeit with a smaller turbine: "Motoring starts the blades spinning so the turbine operates in lighter wind conditions than if it relied solely on the wind to start." at

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Vortex generators may be used to control the lift characteristics of the blade. The VGs are placed on the airfoil to enhance the lift if they are placed on the lower (flatter) surface or limit the maximum lift if placed on the upper (higher camber)

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I must agree that I don't feel that this article has answered the question fully: Why not have 6 blades? Indeed, small turbines seem to have more blades. Also, the bit about aerodynamic efficiency could be explained a little better I think. What

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in January 2006, well before the copyright date of the Castellano book. The Google preview of its contents shows me that this book section is substantially derived from Knowledge articles, not the other way around. I have reverted this edit

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losses. And I don't know any turbines, that really use a motor in low wind situations. But if you know the power of the turbines, you might also know the type? Or have a picture for us? That would help a lot in answering your question.

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The Castellano book appears to use large chunks of this article, but when I used Google Books to search its contents I was unable to find a Knowledge credit. I checked for the phrase "night time" and found it was added in this edit

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Apart from basic mechanics of these stresses I would also like to go in the details of mathematical analysis of this phenomenon. So could you please suggest me some good reference book, lecture notes or any other written material.

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The article does not make any mention of the dangers of employing a DFIG topology. For one, a DFIG draws reactive power from the grid. In light of this, a DFIG wind turbin can contribute to instability in a transmission system.

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suggests articles be split when 50-100k, so another action could be to expand and rename the other article to more technical content, and rewrite this article towards less technical content for the average reader.

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My understanding is that many (most?) so-called "constant speed" turbines connect the induction generator directly up to the grid, and their actual operating RPM (and power produced) varies slightly with the wind

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Stalling is simple because it can be made to happen passively (it increases automatically when the winds speed up), but it increases the cross-section of the blade face-on to the wind, and thus the ordinary

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https://archive.is/20131122140927/http://www.wspa.com/story/23564370/my-secures-off-shore-tender-in-zhuhai-guangdong-province-china-with-3mw-scd-wind-turbine-generators-construction-to-begin-in-october-2013

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Looking through the article it seems to only include the megawatt class turbines and not anything about kilowatt or even watt class turbines. Could someone try putting in more material on smaller turbines?

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If your average house fan has wide fan blades that are designed to *efficiently move air*, then why won't that same basic blade design also be *efficiently moved by air* when applied to a wind turbine?

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These assertions don't seem to be relevant, supported or even referenced further within the article - what utility companies? what government? How does this relate to the topic of wind turbine design?

923:

The generator explanation changes back and forth from asynchronous to synchronous machines and merges explanations from several different technologies. We should clearly define the different methods.

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again I guess :), asking the article to make itself more clear. I apologize for any misunderstanding, I'll plead the fact it took me this long to figure it out as evidence of my sincerity. Sorry :)

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This article is about "Wind Thingys." Because no one has come up with a neat sounding name for a device that operates on Bernoulli's principle is no excuse to gloom on to the word turbine.

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applies here. This article already has a reasonable size, and additions about VAWT, small or non-commercial types could be mentioned here but is best expanded upon in the relevant articles

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yes, but if the redundant content is eliminated, this article increase by a lot less than 15 k. We have some really stupid articles over 100 k, so it's more a guideline than a rule. --

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I try to approach technical questions directly, it's often the best way to get direct answers. Hopefully someone will tackle the questions because it's just not clear to me. Thanks.

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terms, the more obscure ones should either be linked, explained or not used at all on a general encyclopedia. I believe this article pretty much has to be rewritten piece by piece.

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Regarding the suction side I do not see how the VGs would "limit the maximum lift". What they would do is generally control the stall and the post-stall behavior of the airfoil.

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Vortex generators and micro-tabs should not be confused. I replaced the microtab references with vortex generators in the "Stall" section of the article. Micro tabs are serrated

459:"Due to the energy required to manufacture, transport, and erect the components of wind turbines it is debated if over the life of the turbine this energy will be recaptured. 2086:

http://www.wspa.com/story/23564370/my-secures-off-shore-tender-in-zhuhai-guangdong-province-china-with-3mw-scd-wind-turbine-generators-construction-to-begin-in-october-2013

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The anemometer on the turbine should be easily visible, and any wind that can move a 1 foot tri-cup should also move a 120-foot tri-blade. Whatever the case, we still need

2205: 1759:, I also would be interested in knowing how much power is consumed adjusting the nacelle yaw, adjusting the blade pitch, running the warning lights, "motoring" (?), etc. 1381:

are the most efficient. Blade design could elaborate on this. Power direction also means something, as much more wind speed (and power per area) can be transmitted from

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seems to say that often the wind speed at a turbine is adequate to drive a turbine even when the wind speed close to the ground is approximately zero. I agree with

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How can you extract the majority of energy in a circular field of wind by having narrow blades that occupy only a small fraction of that swept-area circular field?

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A turbine, by definition, is an exchange of momentum device. This whole article is about devices that operate on Bernoulli's Principle - not exchange of momentum.

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you improve the aerodynamic efficiency by lessening the friction forces (mostly), and looking at your other question, this was my last answer on this page. Cheers

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Does anyone have a reliable source for the difference in power produced between "comparable" fixed vs. variable-speed wind turbines? Elsewhere on this talk page

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When wind turbine rotor rotates it's blades especially blade roots undergo cyclic stresses. These stresses are due to gravitation forces and inertial forces.

1627:, where wind can feel still on ground but sufficient at hub height to move the blades, if not produce power. Some power is used for electronics and heating. 2200: 123: 1855: 659:

And what does thick/thin refer to - length of the blade (trailing not radial)? profile presented to the wind? aerodynamic thickness of the blade itself?

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It would be a good idea to have a reference for the increase in the aerodynamical efficincy of the wind turbine with the increasing number of blades

952:"Older style wind generators rotate at a constant speed, to match power line frequency, which allowed the use of less costly induction generators." 1410: 1125: 129: 1268:

Do water turbines have blades that only expose themselves to 10% or so of the total circular area of water rushing down a penstock water pipe?

560:"High efficiency 3-blade-turbines have tip speed/wind speed ratios of 6 to 7" is ambiguous: does the ratio range from 6.0 to 7.0 or is it 6/7? 902:

When the turbine controller detects that the power cables have been twisted by three rotations, it shuts the machine down and untwists them. --

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design" is POV on "commercial" and does not count well, as VAWT and other sorts have a count that might be more than the count of the HAWTs.

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different for fan blades and turbine blades. Though I suspect no household fan blade has ever been optimized for aerodynamic performance! --

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seem to think that a variable-speed wind turbine would only capture 2% or 3% more energy than a "comparable" fixed-speed wind turbine. --

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I'm sure I'm missing something here, but it's not completely clear from reading the article so I appreciate any explanation. Thanks!

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Some gearless are lighter and smaller (SWP), some are heavier and larger (Enercon) than gearbox turbines. In both cases, we need

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Does anyone know how the turbines work which rotate at a constant speed irrespective of the wind speed? See for example this one

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Two mundane possibilities for why the blades keep moving even when an anemometer 22 m above ground level reads zero wind speed:

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It seems to be a popular opinion among those who write about aerodynamics; I put the first ref I found into the article. --

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section of this page -- that discusses grid-connected wind turbines in general, both fixed-speed and variable-speed? --

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horizontal etc....(I am not much interested in Aerodynamics forces, since for steady mean wind flow they are constant)

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including connection to the electric grid, etc. Surely some of these pages are worthy of pages in their own right no?

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vary by more than 10% of their top speed so that they can collect more energy at the lower end of wind speed range. --

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to air than from air to rotor, affecting tip speed and therefore aspect ratio. Fan thrust depends on blade area, but

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and the like. The vast majority of wind energy production is made from large grid connected commercial HAWTs (as per

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is not about its title topic, but is about this topic. Any non-redundant useful content should be merged here. --

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to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the

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http://www.endurancewindpower.com/wp-content/uploads/2010/08/E-3120-Product-Brochure-NA-20-Feb-2012-Webready.pdf

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Yes, I gather most household fans are too compact and slow (for good reasons) to be aerodynamically optimal.

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Finally the citation provided by the author of that part does NOT state any of the above (false) statements.

2167: 2049: 1279: 1205:), they happen to be commercial because that is what is feasible. As for a non-commercial wind turbine, see 1117: 1078: 992: 888: 265: 251: 209: 165: 1450:

My understanding is that most electrical power produced on earth, including wind turbines, is generated by

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OK, so where do the friction forces lessen? Does that mean there is better balance on the central bearings?

656:- I told you to add more blades, I never asked you to make them thinner. What happens when they stay thick? 2045: 1647: 1624: 934: 787: 587: 472: 179: 1644:

http://www.endurancewindpower.co.uk/wp-content/uploads/2010/08/E-3120-Product-Brochure-UK-29-Aug-2011.pdf

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I believe that the stall description is very poor and generally inaccurate. Sections like this one:

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https://web.archive.org/web/20140209233955/http://www.indianacleanpower.org/renewableresources.html

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electrons through twice as hard (as it were), i.e. you could put twice the load on the generator.

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on Knowledge. If you would like to participate, please visit the project page, where you can join

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free to copy I guess, but so far feasibility seem to overwhelmingly prefer commercial solutions.

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How is the electricity from the head mounted Generator transmitted to the tower as the head yaws?

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before doing mass systematic removals. This message is updated dynamically through the template

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The "Materials" section of the article briefly discusses materials used for modern wind turbine

2152: 783: 583: 175: 1350:, but a wide range of designs are used there, and I don't know what they're all good for. --- 1988: 1959: 1893: 1859: 1518: 1478: 1447:

While adjusting the blade pitch is a big part of it, I think there's another effect at work.

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Can the dynamic braking resistor described in this article be at least partly replaced with

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a few percent) which means that even with only three blades, each one must be very narrow."

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for the construction and design section ? Upload at wikimedia commons and show image here

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http://www.power-technology.com/features/feature-global-wind-energy-market-gears-growth/

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the overall load factor for wind generation is typically, per month, 10-14%. For April:

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which rotates at a constant 42 rpm. If they do, it would be worth adding to the article

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link. If the link is a good link, you may wish to request whitelisting by going to the

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that the anemometer on the turbine is much more relevant than any anemometer elsewhere.

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If you found an error with any archives or the URLs themselves, you can fix them with

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since citing a source dervied from Knowledge isn't a citation to a reliable source. --

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I doubt that any turbine has a powered rotor - most likely it is a simple case of the

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https://web.archive.org/web/20090205054846/http://www.berr.gov.uk/files/file17821.pdf

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This keeps coming up on the Science Refdesk, so I'm going to try to figure it out.

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The 3rd paragraph in the Blade Count section especially needs more clarification.

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Is there a Knowledge page that discusses fixed-speed wind turbines, analogous to

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Qn: mathematical analysis of the cyclic stresses in the blade root while rotating

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might be the most similar to wind turbines. Efficiency can be more critical for

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to the subject of this article. Relevant policies and guidelines may include

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electrical losses. Maybe you can look that up in the literature. Greetings,

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https://web.archive.org/web/20060419225935/http://www.bwea.com/ref/faq.html

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If you would like me to provide more information on the talk page, contact

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I definitely agree, as far as I am concerned those numbers are made up

1828:(Please put the new section on a talk page at the END of a talk page.) 717:"I told you to add" , i'm not your dog, so please mind your language. 1022:

it mentions the nacelle, rotor blades, rotor hub and transformer. See

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implies that a fixed rotor speed would cause enormous losses; while

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sacrifices too much in blade stiffness as the blades become thinner

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This is terrible. This has nothing to do with wind turbines.

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speed (and adjust for best angle of attack at lower speeds). --

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No, because it is copyrighted, and belongs to the website... -

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http://express.howstuffworks.com/gif/wind-power-horizontal.gif

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contributor has declared a personal or professional connection

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Agree. The present article is 50k, and Feasibility is 15k.

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for additional information. I made the following changes:

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Below is a list of links that were found on the main page:

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Why are wide blades good for fans, but not wind turbines?

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http://www.indianacleanpower.org/renewableresources.html

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Percentage wind power/wind capacity: 12.8% (load factor)

649:- 6% of what? Where is "aerodynamic efficiency" defined? 1985: 1981: 1543: 412: 313:

should be explained better and in a more accurate way.

94:, a collaborative effort to improve the coverage of 2128:using the archive tool instructions below. Editors 2076:

http://energy.gov/sites/prod/files/DOE_CMS_2011.pdf

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wind turbine design#Connection to the electric grid

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may be too technical for most readers to understand

28:This article has not yet been rated on Knowledge's 362:the source cited does not confirm or deny this. 128:This article has not yet received a rating on the 814:Reference on the increased aerodynamic efficiency 1389:for this is not found in the propeller article. 647:a six percent increase in aerodynamic efficiency 2114:This message was posted before February 2018. 642:Yes, that's where my dumb questions multiply. 530:More in-depth version of article at powerpedia 8: 1567:Is there a Knowledge page -- other than the 2062:http://www.berr.gov.uk/files/file17821.pdf 1955:and ask him to program me with more info. 1856:Design feasibilIty of Wind turbine systems 43: 21: 19: 2206:Articles edited by connected contributors 2040:I have just modified 4 external links on 435:Learn how and when to remove this message 419:, without removing the technical details. 1910:Blacklisted Links Found on the Main Page 782:is the input power in this case? Thanks 1672:Percentage wind power/total power: 4.0% 877:the tower vertically, and wire it up? 582:I assume it means between 6:1 and 7:1. 45: 2033:External links modified (January 2018) 1053:Added this image, needs CGI'ing dough 664:Thanks for the quick response so far! 1958:From your friendly hard working bot.— 1663:Average power, all sources, MW: 424.1 1657:Total energy, all sources MWh: 305321 1229:agreement that the reverse is true. 1163:ARTICLE has focus challenge per title 977:Can someone take over the picture at 417:make it understandable to non-experts 298:Stall section needs major re-writing! 7: 1975:Uncredited use of Knowledge material 88:This article is within the scope of 34:It is of interest to the following 2201:Unknown-importance energy articles 1875:Knowledge:SIZERULE#A_rule_of_thumb 699:And I'm not sure what you mean by 14: 2044:. Please take a moment to review 1700:to state the direction of power. 2106:http://www.bwea.com/ref/faq.html 1373:(length/Chord) is important for 919:The generator section is unclear 536:The updated article of wikipedia 491:Emphasis on larger wind turbines 396: 353:Blade Materials Possible Fallacy 149: 75: 65: 47: 20: 2009:may provide info on design for 626:Wind_turbine_design#Blade_count 234:Connection to the electric grid 197:Level of detail of each section 1044:17:04, 12 September 2009 (UTC) 1013:13:08, 12 September 2009 (UTC) 997:10:49, 12 September 2009 (UTC) 477:02:08, 13 September 2009 (UTC) 1: 2017:This claims to go beyond Betz 1917:request page for whitelisting 1737:22:31, 30 November 2013 (UTC) 1660:Average power, wind, MW: 17.0 1360:16:27, 6 September 2011 (UTC) 1338:14:12, 6 September 2011 (UTC) 1323:04:38, 6 September 2011 (UTC) 1301:01:13, 6 September 2011 (UTC) 1218:13:18, 18 December 2010 (UTC) 1083:18:55, 27 February 2010 (UTC) 893:13:56, 24 February 2009 (UTC) 749:he, no hard feelings, Cheers 501:14:46, 2 September 2007 (UTC) 383:01:33, 21 December 2009 (UTC) 345:09:52, 10 February 2010 (UTC) 293:09:52, 10 February 2010 (UTC) 102:and see a list of open tasks. 2182:18:27, 25 January 2018 (UTC) 1902:20:25, 16 October 2013 (UTC) 1888:10:16, 16 October 2013 (UTC) 1845:18:57, 16 October 2012 (UTC) 1822:22:04, 15 October 2012 (UTC) 1181:Unconventional wind turbines 258:) 17:19, 17 April 2013 (UTC) 108:Knowledge:WikiProject Energy 1868:20:37, 9 October 2013 (UTC) 1654:Energy from wind MWh: 12231 1562:variable speed wind turbine 834:09:29, 19 August 2008 (UTC) 808:04:26, 5 January 2010 (UTC) 701:my last answer on this page 283:and not vortex generators. 111:Template:WikiProject Energy 2222: 2196:Unassessed energy articles 2145:(last update: 5 June 2024) 2037:Hello fellow Wikipedians, 1789:21:58, 19 March 2014 (UTC) 1637:18:59, 30 April 2012 (UTC) 1618:15:26, 26 April 2012 (UTC) 1597:21:24, 22 March 2014 (UTC) 1581:17:23, 20 March 2014 (UTC) 1556:19:23, 19 March 2014 (UTC) 1527:16:32, 20 March 2014 (UTC) 1512:21:58, 19 March 2014 (UTC) 1487:19:52, 19 March 2014 (UTC) 1472:19:23, 19 March 2014 (UTC) 1439:18:02, 11 March 2012 (UTC) 1423:04:09, 11 March 2012 (UTC) 1399:19:47, 30 April 2012 (UTC) 1185:Vertical axis wind turbine 624:Your first question is in 270:17:26, 17 April 2013 (UTC) 214:17:26, 17 April 2013 (UTC) 130:project's importance scale 1970:13:21, 3 April 2014 (UTC) 1942:\bpower-technology\.com\b 1835:to support those claims. 1767:wind turbine design#Tower 1284:21:46, 20 July 2011 (UTC) 1155:20:36, 30 July 2011 (UTC) 1106:thanks a lot in advance, 968:22:38, 31 July 2010 (UTC) 939:20:50, 13 June 2009 (UTC) 912:02:50, 2 March 2009 (UTC) 864:16:37, 8 April 2013 (UTC) 850:15:42, 8 April 2013 (UTC) 759:20:07, 22 July 2008 (UTC) 745:19:13, 22 July 2008 (UTC) 727:13:20, 22 July 2008 (UTC) 713:13:10, 22 July 2008 (UTC) 692:13:01, 22 July 2008 (UTC) 674:12:46, 22 July 2008 (UTC) 638:06:29, 22 July 2008 (UTC) 619:06:15, 22 July 2008 (UTC) 551:16:47, 4 April 2008 (UTC) 524:20:30, 7 March 2008 (UTC) 127: 60: 42: 2028:09:46, 31 May 2014 (UTC) 1997:15:54, 21 May 2014 (UTC) 1130:14:08, 26 May 2010 (UTC) 792:22:38, 19 May 2009 (UTC) 598:A dumb question (or two) 592:22:32, 19 May 2009 (UTC) 576:04:24, 4 July 2008 (UTC) 229:01:39, 9 July 2014 (UTC) 156:The following Knowledge 1710:17:06, 3 May 2012 (UTC) 1692:09:15, 3 May 2012 (UTC) 1405:Constant speed turbines 1250:22:43, 9 May 2011 (UTC) 1944:on the local blacklist 1921:blacklist request page 1666:Wind capacity, MW: 133 1648:Wind profile power law 1625:Wind profile power law 1060: 1032: 703:- an archived answer? 455:Wind turbine economics 326: 311: 1801:Gearless wind turbine 1603:Net energy production 1309:I found the comments 1193:Savonius wind turbine 1189:Darrieus wind turbine 1059: 1031: 949:This is NOT correct: 645:What does that mean, 482:Error in Indiana data 358:with larger blades." 319: 304: 170:neutral point of view 2126:regular verification 1925:request page on meta 1452:induction generators 1383:Propeller (aircraft) 1313:enlightening too. -- 162:conflict of interest 2116:After February 2018 2042:Wind turbine design 1698:WP:Reliable sources 1371:Aspect ratio (wing) 945:Induction Generator 800:Quantalume Wanderer 2170:InternetArchiveBot 2121:InternetArchiveBot 1953:User:Cyberpower678 1375:lift-to-drag ratio 1224:Wind Turbine Noise 1197:Small wind turbine 1109:regards, Milind. 1061: 1033: 91:WikiProject Energy 30:content assessment 2146: 1812:comment added by 1387:inline references 1274:comment added by 1253: 1236:comment added by 1143:This is improper 1133: 1118:Milindashokshende 1116:comment added by 987:comment added by 929:comment added by 883:comment added by 836: 824:comment added by 578: 566:comment added by 445: 444: 437: 386: 369:comment added by 275:Vortex Generators 260: 246:comment added by 194: 193: 144: 143: 140: 139: 136: 135: 2213: 2180: 2171: 2144: 2143: 2122: 2073: 1962: 1943: 1824: 1765:(1) The text at 1286: 1252: 1230: 1132: 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