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STICKY:
How Much Power Can You Extract from the Wind?
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from: http://www.thebackshed.com/Windmill/articles/WindPower.asp: "There is a limit to the amount of power we can extract from the wind. Imagine a circular column of moving air, or wind, 2 meters across. We can calculate how much power is in that moving column of wind with the following W...
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windgen
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STICKY:
Spinoff Results
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I'm creating this thread to hold the spinoff simulation results. I'm going to keep it protected so that this thread will only have results. All comments should be posted to Spinoff Discussion. For each turbine tested, I'm going to post as complete and consistent information package as I can. My...
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sjh7132
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STICKY:
Forum Guidelines
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This forum, and its' parent (www.windgen.org,) were started to encourage the development of wind turbines that can produce usable power in low winds. There are milestones in development in the form of sellable turbines and ancillary products (possibly spawned in part by this discussion.) Th...
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windgen
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STICKY:
Engineering Calculators and Tutorials
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Ed Lenz has worked tirelessly contributing to the education of people interested in wind generators. For real hands-on practical demonstrations, see: http://www.windgenkits.com/Tutorials.htm. For the theoretical side of things, the Danish Wind Industry Association has published a grea...
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windgen
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Torque measured or calculated?
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I am setting up a wind turbine for testing various blades. At the bottom of the VAWT there is a Boreas 3 style alternator. Wind will be controlled to a certain speed. The load will be a fixed resistive load to match that wind speed. The varaible will be the blade setup. If X number of output watts are obs...
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Lynx
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Can a Buck converter improve turbine performance???
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After watching Steves video on MPPT, I wonder if a Buck converter would improve turbine performance by limiting the affect of additional loading created by the stators internal resistance. http://en.wikipedia.org/wiki/Buck_converter I found a article in Power Electronics Technology_...
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GoVertical
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Ideal diode LTC4357 as a 3-phase rectifier or a buck/boost diode
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http://cds.linear.com/docs/Datasheet/4357fd.pdf Has anyone tried to use this ideal diode for 3-phase rectification, or in a buck/boost converter at high speed, like 40Khz? The application notes say it is used for ORing power supplies. Power supplies do not switch polarity often. So my guess i...
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definitionofis
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Performance Calcs
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I've been trying to apply equations from a paper to my 20" diameter turbine. I don't know why yet, but my Cp values seem to be quite high. I'm hoping it is simply a problem with a constant like I forgot to divide by 2 somewhere. However, the curves appear to be reasonable. If the calculations hav...
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Caleb
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vawts in use producing power- inspirational pictures, links, details
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perhaps as inspiration we should look at some who have had varying amounts of success in the developement of this " free" energy resource http://www.youtube.com/watch?v=csxl83XfyxA here is an installation in northern Canada.
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itsandbits1
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H-Darrieus design
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Hi, Greetings from Turkey, I was following the forum for a couple of months. I intend to build an H-Darrieus wind turbine. I chose the following design values. Number of blades:3 Blade type: NACA 0015 symmmetric airfoil Chord length: 10 cm (I think high blade thickness may be needed due to weakness of...
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ferroburak
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naive's helical vawt
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Naive was posting on Lynxs so I started this for him Hi Guys.. Remember me ... I've been working on a helical turbine.. It looks good... But it needs improvements... -- Edited by itsandbits1 on Sunday 4th of December 2011 05:04:50 AM
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itsandbits1
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VGOT Darrieus
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its kind of flattened Darrieus turbine, instead of rotating, during the fase you pick up most of the wind you straighten this out Gets Cp 55% http://www.intechopen.com/source/pdfs/14800/InTech-Innovative_concepts_in_wind_power_generation_the_vgot_darrieus.pdf -- Edited by broth...
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brother paul
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Fancy Serpen PMA
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i just want to share this Person's project. http://www.daswindrad.de/forum/viewtopic.php?f=8&t=938&start=330 http://www.youtube.com/watch?v=GUuRIPj77s4 I know that he spent along time to create this beauty. sam
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faroun
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A small disaster lesson about wind turbines
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A small disaster lesson about wind turbines Monday, January 16, 2012-21: 23' Snurran was at 3 kW with a wingspan of 3 m. Gängstav and generator was Rusty at delivery. That is, it started not good ... ShareTweetNEWS Own Electricity test new wind turbines on our Hill in Katrineholm. It is half the ide...
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Bob Mann
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SOPA
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This isn't a wind subject, but it could affect our forum. SOPA is legislation that the US Govt is trying to pass that could really affect our ability to have sites like this forum, where users are allowd to post content. [video=http://www.youtube.com/watch?v=9h2dF-IsH0I&feature=g-all-...
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sjh7132
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Wind Turbines using Hard Disk Drive Magnets
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Hello, Could anyone please direct me to a website or page where someone has succeeded in constructing a very simple wind turbine from hard disk magnets. I merely want to demonstrate to some of my students that it might be possible and hopefully if they can succeed in lighting a lightbulb they will be in...
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TeacherCZ
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MPPT Specs
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I'm staring this thread because I'm finishing up my MPPT design and wanted to get some feed back on some of the specs before I started to route the board. First voltages and currents: Max input voltage 600v (400v mppt range) Max input current 60A Max output voltage 100V Max output current 60A The 60 amp...
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sjh7132
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Big Lenz Turbine
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Found this video on Youtube. Hopefully it will get somewhere. The Ax. Flux alt looks pretty powerfull... http://www.youtube.com/watch?v=5D_lJka2wDg&feature=plcp&context=C3dbee43UDOEgsToPDskLc61TXvzClV2vb314tgkXF Warrior
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warrior77
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baker wind turbine (talk about inventive physics)
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http://www.youtube.com/watch?v=DprGpkMkacs here is the justification for his claimed power output. like a lot of the best ones, unfortunately they are never put into production. The inventors are either abducted by the big oil MIB or aliens, whoever gets to them first larryswindcatcher said....
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itsandbits1
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links to VAWT messageboards
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can everybody post the links of all different VAWT messageboards ?
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brother paul
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A turbines carbon footprint.
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I have been working on this for a few weeks now. As Marcus has said under his thread cost per KWh for the turbine. I also look at Co2 produced for the construction of the turbine this includes the making of the materials and transportation costs per ton mile etc, etc. For an example the turbine that is in th...
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MarkW
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Wind-powered aeration of water
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Hi all, I am looking into how to aerate water with wind power. Why? For growing algae for biofuel and/or nutritive products. This is not the only potential application however, since aquaculture and waste treatment require aeration of water as well. So what I hope to find is a practical design, much m...
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Adam
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What size rotor should I build?
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I finally have a rotor design that I want to scale up, now the question is how big to make it. My first goal is to build a system big enough to compare with other VAWTs being built by those on this board. It is a "drag" type rotor with good start up torque. I"m expecting it to run loaded at abou...
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fluitic
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A big battery system.
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A big battery system. http://www.youtube.com/watch?v=cv6XA1A7-rU It is a start.
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GoVertical
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Started New VAWT proto-type
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I completed fabricating a new VAWT. I still need to attach the PMA. I will first try direct drive and if that proofs not to provide enough RPMs it can easily be configure with a pulley and belt drive. The proto-type shows the hub needs a lot of improvement and I still need to add alignment braces to the top a...
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GoVertical
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How Efficient Can A Drag Machine Be?
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The discussion about the Baker Wind Turbine has me wondering how efficient a drag type of turbine can be? It seems that we can come up with a simple model and use some basic physics equations to figure that out. Imagine some object on a frictionless surface (ice rink). This object has area A for collec...
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sjh7132
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FIT Tariff review
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For all of us windy nuts out there. There is some good news in the UK. They are now cutting the the hand out for PV instalations from 43p per Kwh to 21p per Kwh. this now makes wind better than PV. this is for systems rated under 4Kw.
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MarkW
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Steves controller working WOW
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Hello Hello this is a controlled bench test of Steves Smart Controller A new type of controller for small wind turbines and Hydo and fuel fired power generators. I this has to be one of the most amazing product to come along for the DYI wind and Hydro world . By one hand I can make over 121 Watts from the Man...
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Bob Mann
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Wind Turbine Reveiws
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I was trying to find some information on the QR5 Vawt on this site, I just could not get over how bad this turbine is at 5ms. anyway if you look under green energy reviews, they have loads of information and test reports on loads of wind turbines if anyone is interested. http://www.bettergeneration.co...
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MarkW
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VAWT-DWFTTW
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ok i told onc it should be possible to do the same with a vawt ? and look at this picture the fifth car from the left... is a vawt -- Edited by brother paul on Monday 9th of January 2012 03:49:32 PM
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brother paul
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