Chris;
The Fan impeller ( centrifugal impeller) as Carlos said ( he has vast experience with them) is limited to low power and low heads ) Not greater than about 10 meter (33 feet). The Nozzle to the impeller should be formed close to the blades ( following the circular curve of the impeller) and the Nozzle needs to be reduced at the impeller and not back away from the impeller. The impeller needs to have the Nozzle placed from above, coming from Quadrant I, like an overshot and supplying water for around 90 degrees on Quadrant II of the impeller and expanded horizontally to fulfill the proper Nozzle area that should be lower than the arriving pipe area to insure maximum pressure on the impeller blades. This way the water exiting the internal side of the Quadrant II can flow toward the internal side of Quadrant IV impeller blades to add additional power to the overall system power. The plastic pipes can be modified easily, with heat, to form the Nozzles as needed. I have used washed sand heated to insert the end of the pipe, in the heated sand, to soften the plastic and to mold it using wooden plugs or "plates" to conform the Nozzle as needed. Using blow torches is another way if done carefully. Right now I am assisting a friend that is setting a small hydro in his Canadian "lodge" to produce from 60 to 400 watts. The Nozzles ( 4 ) of different sizes for 2 to 10 l/s ( built using 2 " pipes) - 4 can be installed at the same time on the impeller frontal area for easy and future automatic selection of the proper number of Nozzles depending on the available water level. This system is using a brushless 3 phase PM motor as a generator, supplied by Michael Lawley from EcoInn in New Zealand, www.ecoinn.co.nz. directly driven by the turbine and set for Half voltage Delta configuration since the turbine is at some distance from the load ( a battery bank ). Stainless Steel Impellers are available in several diameters and widths, being about 1000 watts the maximum power that should be harvested to insure long life the impeller I hope this help Nando ----- Original Message ----- From: "Carlos Bonifetti" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Saturday, December 25, 2004 2:56 PM Subject: Re: [microhydro] Re: Digest Number 1025 > > > OK Chris, some later but... the end of the year did put me in troubles and backlogging. See my comments under your lines. > > Happy new year, > > Carlos > ----------------------------------------------- > ----- Original Message ----- > From: Hoppy > To: [email protected] > Sent: Friday, November 05, 2004 9:28 AM > Subject: Re: [microhydro] Re: Digest Number 1025 > > > > Carlos - thank you for the information... > > I have a small Do-it-yourself system using a squirrel cage fan. 27 feet > head. 4 inch penstock 430 feet long. Works best as an overshot wheel. I go > from 4 inch pipe to a 3 inch round nozzle aimed at the top center of the > blades. Gives me about 250 rpm at the turbine and enough torque to drive an > old generator. > > Be careful..less diameter...less flow. Perhaps the penstock willl be of greater diameter (6" or 8") for reducing down in the nozzle. > > For the home enthusiast, the squirrel fan has allowed me to create a system > and learn all about generating electricity without costing me an arm and a > leg. > > That's good > > The next step would be to upgrade the various parts to get better > efficiency - including a proper turbine - all in good time... > > Good luck, > Carlos > > Chris > > > > ----- Original Message ----- > From: "Carlos Bonifetti" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Tuesday, February 15, 2005 12:04 PM > Subject: Re: [microhydro] Re: Digest Number 1025 > > > > > > > > Hi Chris: > > > > As an industrial centrifugal, radial & backward curved blade impellers, > 'Sirocco' ones and cross flow turbine builder, I can tell you that squirrel > fan impellers (or 'Sirocco' type as commercial named) relatively narrow wide > could be used as simple/cheap and some poor reliability cross-flow turbine > runner, but only for small heads not greater than 8 - 10 meters and small > power, because the too thin impeller blades. The fan casing can't be used so > it could be made with welded or riveted steel plate. The nozzle must be made > with small angular arc very well adjusted to the impeller side plates and > without flow control valve thus for fixed flow operation. An epoxy paint, > some 5 mils, applied at the impeller will be good for corrosion protection. > The water must be very clear without any abrasive particle, sand, etc. Ball > bearings can be pillow blocks SKF 'SY' type or equal. > > > > Best Regards, > > > > Carlos Bonifetti > > Chile > > --------------------------------------------------------- > > ----- Original Message ----- > > From: Hoppy > > To: [email protected] > > Sent: Friday, October 29, 2004 3:10 PM > > Subject: Re: [microhydro] Re: Digest Number 1025 > > > > > > > > Has anyone responded to your question? Squirrel fans do seem like a > cheap > > way to set up a small system... > > > > Could you please keep me informed? > > > > Chris > > > > ----- Original Message ----- > > From: "The Dragon" <[EMAIL PROTECTED]> > > To: <[email protected]> > > Sent: Wednesday, October 27, 2004 2:51 PM > > Subject: [microhydro] Re: Digest Number 1025 > > > > > > > > > > > > > > > > Didn't anyone ever try using squirrel cage fans as a pass-thru wheel > > > when doing a really small hydro site? Seems like it would be a good > > > idea if they are short on funds or lack equipment. > > > The Dragon > > > > > > > > > > > > --- In [email protected], Max Klohn <[EMAIL PROTECTED]> > wrote: > > > > > > > > Dear all, > > > > > > > > Those peltric look good and and one might even be able to choose the > > > > right parameters per-site. The question is the costs for an import > > > > operation... Would probably need some volume to be cost-effective. > > > > > > > > IMHO the mising link here in Chile to locally produce peltrics is a > > > > reliable local or imported source for cheap IGC's (and their > > > replacement > > > > parts). The rest of the stuff is available, or ppl can be trained. > > > > > > > > I do *not* believe in plastic runners, at least the locally > > > supplied, > > > > after what I have seen here. And it would be hard to sell more > > > plastic > > > > runners, even sturdy ones, to the people who have had problems with > > > > previous ones. > > > > > > > > Let us talk... > > > > Regards, > > > > > > > > Max > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Does your company feature in the microhydro business directory at > > http://microhydropower.net/directory ? 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