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 ? If not, please register free of > charge and be exposed to the microhydro community world wide! > > > > NOTE: The advertisements in this email are added by Yahoogroups who > provides us with free email group services. 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