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Vertical axis windmill prices

Discussion in 'Home Power and Microgeneration' started by The Master, Jun 11, 2008.

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  1. The Master

    The Master Guest

    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...
     
  2. You

    You Guest

    Did you try CALLING the OEM's, on the Phone, and asking them the price?
     
  3. Eeyore

    Eeyore Guest

    10 mph is a pretty slow wind to get much power from and at *ground level* too
    ?

    Graham
     
  4. RW Salnick

    RW Salnick Guest

    brought forth on stone tablets:
    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
     
  5. Guest

    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
     
  6. Guest

    Not if they are fast.

    Nick
     
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