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New Darrieus Turbine | 31 comments (31 topical)

Re: New Darrieus Turbine (3.00 / 0) (#20)
by IntegEner on Wed Sep 07, 2005 at 09:01:47 AM MST

My reputation usually precedes me and if it hasn't there, here it is. I am just some dumb guy. Even so, I have run small verticals wind turbines and have seen profound differences due to blade thickness, preferring now thin blades exclusively. The Savoniuses have a champion in the Windside company in Finland and their website shows an example of the best of them having 252 watts of rated power at 15 m/s (33.5 mph) wind from 4 square meters of swept area and weighing 700 kilograms (1543 pounds). I have been in contact with Ed Lenz and respect the approach of running special designed machines to extract energy from light breezes with their combinations of lift and drag aerodynamics. His approach derives, in detailed information provided, from flight and special high lift wings of aircraft he has put together and flown. This same information includes disclaimers that such aircraft cannot fly but so fast with such wings. This focus is well and good, reflecting however difficulties with scaling up. I hope to find mutual accommodation with these views as time proceeds. If you have some insights to offer about how I "know more than you", I would like to hear them, even privately through e-mail.

Anthony Chessick
www.integener.com

[ Parent ]

Re: New Darrieus Turbine (3.00 / 0) (#30)
by free energy64 on Wed Oct 19, 2005 at 05:25:39 PM MST

Hi, I too am intrigued by the Windside design and wish to try and duplicate the design for my own turbine.
The simplicity and very low cut-in speeds, coupled with the fact that they would be much quieter than a horizontal turbine and thus would be suitable for suburban installations really appeals to me and I wish to try and manufacture one for myself.
I would really appreciate if you had more detailed plans and or drawings of these units as the web site does not give enough detail of the actual blade details.

Look forward to your comments.

Regards
Paul

[ Parent ]

Re: New Darrieus Turbine (3.00 / 0) (#31)
by IntegEner on Thu Oct 20, 2005 at 08:07:52 AM MST

I take this request seriously and here is a like answer. Constructing a Savonius requires heavy machine work even in the cases of just cutting and welding 55 gallon drums to a rotating shaft in an offset geometry. Your handle of "free energy 64" seems to indicate you are more the theoretical type. I have seen good and bad Savoniuses here in the U.S. west. The good: Moriah Power by Dave Timothy in Toquerville, Utah at (435) 635-2247 who has a couple of them in plain view near the Interstate. Call him. The bad (I won't say whose): a very large, nonoperational, bird's nest of a unit on a steel stand readily seen in Chowchilla, CA in the central valley. 252 watts of power at 33 mph windspeed, remember, is just a few light bulbs. Something else happening is that a modified rotator that uses the Savonius principle in a multibladed (but blades of a narrower width) configuration is being developed. These are otherwise known in smaller versions as ordinary roof ventilators, the kind that look like small domes that rotate. A website that features these is at www.globalwindtech.com and a fairly large unit is running (so they tell me) in Hesperia, CA near San Bernardino. As these grow in size, the same comment can be made about them as with the rest - the wind drag on the side moving upwind exacts a toll that can't be designed out. You may also try others who have come up with a variant known as the "Benesh" rotator, a Savonius with specially shaped blades, some of whom have been linked to on my website, www.integener.com, on the Customer Data Base page. Plans are only a small part of the story in making them and perhaps the easiest part. Most Savoniuses are someone's "creation", even "artistic creation". Let's see what you can do. I almost forgot the www.aerotecture.com website. They have a power curve to be viewed on it indicating the same thing - a 50 square foot unit full of carefully bent tubing that must be replicated many times on rooftops to produce cost effective power. Air is heavy - 2 pounds per cubic yard - and, when given a chance if moving at a respectable speed, create much energy from being simply deflected by a few more or less quickly moving blades horizontally or vertically that don't need to be very cumbersome.

Anthony Chessick
IntegEner-W
Tehachapi
www.integener.com

[ Parent ]

New Darrieus Turbine | 31 comments (31 topical)

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