Vertical axis windmill prices

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Subject Author Date Vertical axis windmill prices The Master 06-11-2008  Re: Vertical axis windmill prices You 06-11-2008  Re: Vertical axis windmill prices Solar Flare 06-11-2008  Re: Vertical axis windmill prices Eeyore 06-11-2008  Re: Vertical axis windmill prices Anthony Matonak 06-12-2008  Re: Vertical axis windmill prices Solar Flare 06-12-2008  Re: Vertical axis windmill prices Ron Rosenfeld 06-12-2008  Re: Vertical axis windmill prices nicksanspam 06-12-2008  Re: Vertical axis windmill prices RW Salnick 06-12-2008  Re: Vertical axis windmill prices nicksanspam 06-12-2008  Re: Vertical axis windmill prices Ken Maltby 06-12-2008  Re: Vertical axis windmill prices Ken Maltby 06-12-2008  Re: Vertical axis windmill prices daestrom 06-13-2008
Posted by Solar Flare on June 12, 2008, 8:26 am Please log in for more thread options You just have to chop a lot of wood and live in Mexico. > Eeyore wrote: >> >> The Master wrote: >> >>> Does anyone by chance have a price, or know of a place selling them that >>> actually tells you the price up front, for a vertical axis windmill >>> large >>> enough to power a 2,000 square foot grid connected home in a 10 MPH >>> average wind? >> >> 10 mph is a pretty slow wind to get much power from and at *ground level* >> too >> ? > > I don't have the numbers in front of me, but I seem to recall the last > time one of those criminal MLM scams for windtree came up I figured that > the wind turbine would have to be about as big as the house itself. > > Anthony Posted by Ron Rosenfeld on June 12, 2008, 8:30 am Please log in for more thread options On Wed, 11 Jun 2008 18:06:40 +0000, The Master > >Does anyone by chance have a price, or know of a place selling them that >actually tells you the price up front, for a vertical axis windmill large >enough to power a 2,000 square foot grid connected home in a 10 MPH >average wind? > >I have been able to locate several makers of vertical axis windmills, but >I have been unable to locate any sort of a price quote. And I get enough >spam e-mail as it is, without having to sign up for more just to get a >price... There are too many unknowns in your question to predict what size wind turbine you might require. Given that, I would wonder if your 10 MPH average wind speed is accurate. Also, VAWT's have had a bad reputation in the past. I don't know the current status, having not looked into it for some years. But be sure to investigate thoroughly any company with which you might want to do business. It had been my impression that The level of efficiency, reliability and cost-effectiveness found in horizontal turbines is far greater than that of verticals, though you would never know this from the claims of many vertical manufacturers. The size turbine you might require depends NOT on the size of your house, but rather on the amount of energy your house requires. A European home in that size range might consume 5 kWh/day; a US home in certain parts of the country might consume ten times as much! The amount of energy you might be able to harvest from the wind depends importantly on turbulence (higher closer to the ground), altitude, and other factors. There are some wind-energy groups on Yahoo that you may find of value. Is your goal to lower your energy costs? Or are you primarily interested in tinkering and experimenting? --ron Posted by on June 12, 2008, 11:48 am Please log in for more thread options >Does anyone by chance have a price, or know of a place selling them that >actually tells you the price up front, for a vertical axis windmill large >enough to power a 2,000 square foot grid connected home in a 10 MPH >average wind? An average US house uses about 800 kWh/mo, about 1100 watts on a continuous basis, and page 36 of Paul Gipe's 1993 Wind Power book says the wind power density with a Rayleigh speed distribution is 0.104V^3 W/m^2, where V is the average windspeed in mph and the best rotors achieve 40% efficiency (vs the 60% Betz limit)... 90% efficiencies for the transmission, generator, and power conversion make the wind power density 0.0303V^3 W/m^2, or 30.3 W/m^2 at 10 mph, so you might have 1100/30.3 = 36 m^2 of swept area, eg a 22 foot diameter circular windmill, comparable to the size of the house. I don't know where to buy one of these, but you might make a high-speed, 6-blade double-delta Darrieus rotor with 2 tetrahedra joined on a horizontal face, rotating on 2 points, with an automobile wheel at the top and another at the bottom, attached to a 5:1 step-up auto rear with the spider gears welded together, with more stepup for an induction motor that could act as a motor to start the rotor. It might have 6 galvanized steel tubes and 6 thin, low-solidity dacron sailcloth sailblades with the leading edges wrapped around the tubes and trailing edges attached to 6 wires. A tension ring with 3 horizontal wires could connect 3 points halfway up to give the windmill vertical support, and 3 guy wires could hold down a pillow hlock at the top. Good luck :-) Nick Posted by RW Salnick on June 12, 2008, 11:00 am Please log in for more thread options nicksanspam@ece.villanova.edu brought forth on stone tablets: > > >>Does anyone by chance have a price, or know of a place selling them that >>actually tells you the price up front, for a vertical axis windmill large >>enough to power a 2,000 square foot grid connected home in a 10 MPH >>average wind? > > > An average US house uses about 800 kWh/mo, about 1100 watts on a continuous > basis, and page 36 of Paul Gipe's 1993 Wind Power book says the wind power > density with a Rayleigh speed distribution is 0.104V^3 W/m^2, where V is > the average windspeed in mph and the best rotors achieve 40% efficiency > (vs the 60% Betz limit)... 90% efficiencies for the transmission, generator, > and power conversion make the wind power density 0.0303V^3 W/m^2, or 30.3 > W/m^2 at 10 mph, so you might have 1100/30.3 = 36 m^2 of swept area, eg > a 22 foot diameter circular windmill, comparable to the size of the house. > > I don't know where to buy one of these, but you might make a high-speed, > 6-blade double-delta Darrieus rotor with 2 tetrahedra joined on a horizontal > face, rotating on 2 points, with an automobile wheel at the top and another > at the bottom, attached to a 5:1 step-up auto rear with the spider gears > welded together, with more stepup for an induction motor that could act as > a motor to start the rotor. > > It might have 6 galvanized steel tubes and 6 thin, low-solidity dacron > sailcloth sailblades with the leading edges wrapped around the tubes and > trailing edges attached to 6 wires. A tension ring with 3 horizontal wires > could connect 3 points halfway up to give the windmill vertical support, > and 3 guy wires could hold down a pillow hlock at the top. > > Good luck :-) > > Nick > Interesting design. But multiply by two for required area - VAWTs only use half the swept area (in fact, it is worse than that, since the advancing side adds drag, but who's counting?) bob Posted by on June 12, 2008, 2:54 pm Please log in for more thread options >... VAWTs only use half the swept area Not if they are fast. Nick Similar Threads Posted Residential small vertical axis wind turbine December 21, 2008, 12:16 am Re: Peak oil/oil prices.....??? April 20, 2008, 2:31 am Kill-a-Watt prices August 21, 2007, 12:43 pm Vertical borehole ground source heat pumpts January 2, 2008, 5:32 am North/South (elivation) Single-axis Tracking December 18, 2007, 3:57 pm Brake for small windmill? 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