ROBERT: I am based in USA and retired, but I assist many in different countries.
Regards Nando ----- Original Message ----- From: "Simpson, Robert" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Wednesday, September 07, 2005 7:03 AM Subject: RE: [microhydro] boat propellers as runners > As yet, I do not have an information package available to be distributed > but that is indeed the objective over the next year. > > I'm sure there are manufacturers in Peru with casting facilities and I was > just using this as an example. Would a design procedure involving casting > as the manufacturing process be of more use for you? In which country are > you based? > > > -----Original Message----- > From: [email protected] [mailto:[EMAIL PROTECTED] > Behalf Of HYDRO > Sent: 07 September 2005 12:12 > To: [email protected] > Subject: Re: [microhydro] boat propellers as runners > > > Robert: > > The basic question is : How can us attain the technical information to > define and conform the metal to the necessary shape, some countries do > have > capability to do metal casting, > > How can we obtain the technical ( mathematical formulas and processes) for > such endeavor. > > I find that many have to use Bankis ( locally built) and adapt to the > situation due to the lack of the necessary info to fabricate the > propellers. > > If you have such information available, I will be one requesting it, and > as > an Engineer I would assist others to become proficient in the use of the > information package. > Strange that Peru does not have metal casting capabilities, unless it is a > local problem and not a national lack of capabilities. > > So, can you send to me a technical package, I can take in English, Spanish > (native language), French, and, as well, Italian and Portuguese. > > Regards > > Nando > > > ----- Original Message ----- > From: "Simpson, Robert" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Wednesday, September 07, 2005 4:38 AM > Subject: RE: [microhydro] boat propellers as runners > > >> The existing turbine has a rotor diameter of 300mm for a speed approx. >> 800 >> rpm, H=4m and Flow=150-180 l/s. Which should produce about 4kW-5kW, >> without generator and mechanical efficiency included. If you increase the >> operating speed for the same site conditions, the diameter needed >> decreases and the blade angles need to be recalculated. A similar powered >> turbine with a lower head of say H=2m but with a larger flow rate of 340 >> l/s would require a larger diameter runner and a slower operating speed >> (maybe 400-500rpm). In this case, the diameter could be as high as 500mm >> depending on what specific speed you choose. So I suppose, propeller >> diameter anywhere up to 500mm might be of potential use if they match the >> blade angles needed for a specific set of turbine operating conditions. >> >> The main constraint with regard to developing countries is that the >> method >> of manufacture is cost-effective for local manufacturers and the >> equipment >> and materials are readily available. For example, the manufacturer we are >> working with in Peru only has basic equipment such as sheet metal bender, >> welder and a method to heat the metal for shaping. No casting or milling >> processes are required. >> >> Another low-cost option might be to use a suitable boat propeller but as >> was outlined in the previous post by Eilrem it can be difficult to source >> a specific prop that suits the diameter and blade angles that you require >> for the site conditions. It is an iterative process to a certain extent >> so >> if a suitable prop is sourced then the speed of the turbine can be >> adjusted to suit within limits. >> >> regards >> Robert >> >> >> >> -----Original Message----- >> From: [email protected] [mailto:[EMAIL PROTECTED] >> Behalf Of Girish Kharel >> Sent: 04 September 2005 22:05 >> To: [email protected]; Simpson, Robert >> Subject: Re: [microhydro] boat propellers as runners >> >> >> This sounds like an interesting project. For a range of head (say up to >> 10m) >> and flow conditions in the 0-5 kW power range, what would be the >> corresponding speed and rotor diameter? This would then give an >> indication >> of the sizes of propellers that we are interested in. I am assuming that >> you >> have already done the theoretical work on the application range. >> >> You mention that the design is for use in developing countries. What >> particular conditions/constraints do you have in mind? >> >> Regards >> >> Girish >> >> ----- Original Message ----- >> From: "Simpson, Robert" <[EMAIL PROTECTED]> >> To: <[email protected]> >> Sent: Tuesday, September 06, 2005 2:47 PM >> Subject: RE: [microhydro] boat propellers as runners >> >> >>> Do you have any more details about schemes where a boat propeller was >>> used >> or modified for use for a low-head turbine? >>> >>> I am currently working on a project to develop a design method for >> cost-effective manufacture of propeller turbines in the pico-hydropower >> range (ie 0-5kW). The focus so far on the method of manufacture for the >> runner has been to cut the blade shape from flat sheet steel and then >> bend >> and twist into the desired geometry using some heat and hammer. From >> computer simulations conducted so far it doesn't appear that much >> efficiency >> is lost by using constant thickness blades as opposed to profiled blades, >> as >> long as the pitch angles and twist are designed correctly for the site >> conditions (head, flow rate, operating speed). These will hopefully be >> confirmed soon with field testing of a prototype turbine. >>> >>> The overall aim of the project is to develop a design manual and >>> software >> that can be used for the design of low-head propeller turbines for use in >> developing countries. Any other comments, advice or potential case >> studies >> etc.... would be most welcome. >>> >>> Robert Simpson >>> >>> >>> >>> -----Original Message----- >>> From: [email protected] [mailto:[EMAIL PROTECTED] >>> Behalf Of [EMAIL PROTECTED] >>> Sent: 05 September 2005 22:12 >>> To: [email protected] >>> Subject: Re: [microhydro] boat propellers as runners >>> >>> >>> Boat propellors definately do work in micro hydro. If you machine the >>> rounded tips off a bit , they are even better. Add some pre swirl vanes, >> or a >>> scroll case and you have a low cost approach >>> >>> >>> [Non-text portions of this message have been removed] >>> >>> >>> >>> >>> >>> >>> >>> 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. The microhydro-group does not >> endorse products or support the advertisements in any way. >>> >>> More information on micro hydropower at http://microhydropower.net >>> >>> To unsubscribe: send empty message to >> [EMAIL PROTECTED] >>> Yahoo! Groups Links >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> Does your company feature in the microhydro business directory at >> http://microhydropower.net/directory ? 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The microhydro-group does not >> endorse products or support the advertisements in any way. >> >> More information on micro hydropower at http://microhydropower.net >> >> To unsubscribe: send empty message to >> [EMAIL PROTECTED] >> Yahoo! Groups Links >> >> >> >> >> >> >> >> >> >> >> >> 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. The microhydro-group does not >> endorse products or support the advertisements in any way. >> >> More information on micro hydropower at http://microhydropower.net >> >> To unsubscribe: send empty message to >> [EMAIL PROTECTED] >> Yahoo! Groups Links >> >> >> >> >> >> >> > > > > > > > > > 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. The microhydro-group does not > endorse products or support the advertisements in any way. > > More information on micro hydropower at http://microhydropower.net > > To unsubscribe: send empty message to > [EMAIL PROTECTED] > Yahoo! Groups Links > > > > > > > > > > > > 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. The microhydro-group does not > endorse products or support the advertisements in any way. > > More information on micro hydropower at http://microhydropower.net > > To unsubscribe: send empty message to > [EMAIL PROTECTED] > Yahoo! Groups Links > > > > > > > ------------------------ Yahoo! Groups Sponsor --------------------~--> Get fast access to your favorite Yahoo! Groups. Make Yahoo! your home page http://us.click.yahoo.com/dpRU5A/wUILAA/yQLSAA/FGYolB/TM --------------------------------------------------------------------~-> 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. The microhydro-group does not endorse products or support the advertisements in any way. 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