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Thread: Wind power

  1. #1
    Join Date
    Nov 2009
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    Saskatchewan
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    Wind power

    Anyone figure out how to turn an old fan blower into a windmill to make power?
    Or work on any wind systems?

  2. #2
    Join Date
    Nov 2008
    Posts
    1,673

    back of the envelope calc.

    40'/sec wind
    13 sq. ft blade swept area
    air weighs 1# for each 13 cu. ft.
    40x13 = 520 cu. ft. per second = 40# of air per second through the fan =1.3 hp but you can only get half of this, maximum, out of the wind.

    Make a prototype.
    A battery powered drill run in reverse is a DC generator.
    You hang a smaller version of this large fan out of the window of a car moving at 40'/sec.
    Don't get on the evening news.

  3. #3
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    Nov 2009
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    Saskatchewan
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    Sooooo....... what does that mean for me?

    Just curious because I tore an old leibart out and those fans spun! I left in the customers scrap iron pile for a month and I mean those fans spun! Fast, and with little wind.

  4. #4
    Join Date
    Nov 2008
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    1,673
    Quote Originally Posted by deux View Post
    Sooooo....... what does that mean for me?

    Just curious because I tore an old leibart out and those fans spun! I left in the customers scrap iron pile for a month and I mean those fans spun! Fast, and with little wind.
    You need to hook it up to a generator (a junkyard auto DC generator?) with a load and a wattmeter. Try a prototype. The most difficult part may be finding a gear train/belt drive that gives you max. power into the gen.

    Or hook it to a home-made Prony Brake
    http://media-2.web.britannica.com/eb...4-F70AE81F.gif
    You'll need a tach in any case.

  5. #5
    Join Date
    May 2000
    Location
    Urbandale IA. USA
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    4,962
    I took an ECM - put a large squirl cage blower wheel on it - put a belly band mounting on the motor - placed it 3 ft away from an old belt driven blower and produced 60Vac 3ph (with the end bell off the motor)
    It may have been more efficient with a BLADED fan, but I am interested in VAWT tecnology so I don't have to commutate with the wind dirrection.

    I have been told those ECMs are 3/4 HP so you do the math.
    Check into VAWT (Vertical Axis Wind Turbine) on Youtube.

    Or check this site out
    http://www.helixwind.com/en/index.php
    http://www.everwindpower.com/
    Those who dance, appear insane to those who do not hear the music.
    Those who believe, appear ignorant to those who do not know God.

  6. #6
    Join Date
    Nov 2008
    Posts
    1,673
    Quote Originally Posted by cehs View Post
    I took an ECM - put a large squirl cage blower wheel on it - put a belly band mounting on the motor - placed it 3 ft away from an old belt driven blower and produced 60Vac 3ph (with the end bell off the motor)
    It may have been more efficient with a BLADED fan, but I am interested in VAWT tecnology so I don't have to commutate with the wind dirrection.

    I have been told those ECMs are 3/4 HP so you do the math.
    Check into VAWT (Vertical Axis Wind Turbine) on Youtube.

    Or check this site out
    http://www.helixwind.com/en/index.php
    http://www.everwindpower.com/
    You need to load down the 60v with a variable resistor. When it drops to 30v you have found the maximum power point.

    30v into a 120v 1200w 12 ohm non-electronic toaster is (30^2)/12 = 75w.

    Alternatively, if you short the 60v gen. and you get 1A, the max power you can get from this gen. is 900/60 = 15w.

    The average house presents a 1 kw avg. load; (240^2)/1000 = a 60 ohm load at 240v. Peak load may be 40 kw but you could handle this with a battery bank and invertor.

    Are we doin' DIY?

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