Nando , As this is a prototype a small project I am gathering ideas as I go along what I am thimking of now is a system that will charge a battery bank the batteries will be complimented by supercapacitors .As you can see I am focussing mainly on the electrical side of things .Improving the efficiency and charge holding capacity . If you had to order a system from me one that I would build what would be your specifications ?
--- HYDRO <[EMAIL PROTECTED]> wrote: > Wayne: > > The idea may be good, using Bamboo, BUT since you > are learning now, do not > use it, take the Bamboo problems out by using either > plastic or other > materials for your project, then later, when you > KNOW what you are supposed > to do, change the materials to your needs. > > I learnt from my father the use of Bamboo. > He taught people how to use it in the early 1930's > in remote areas of my > native country. > Taught how to carry water for long distances using > Bamboo aqueducts, how to > protect the Bamboo for long lasting, how to clean > the inside chambers to > present a clean and continuous surfaces to reduce > the roughness, increase > the pressure carrying capabilities, house hold > water, including baths and > toilets and how to make small generators for local > energy. > > Try to get your turbine already done to save time. > > Can you detail what your plans are ?. > > Regards > > Nando > > > ----- Original Message ----- > From: "wayne burton" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Monday, October 17, 2005 3:54 AM > Subject: Re: [microhydro] Re: direct drive of > centrifugal pump by a turbine > > > > Thanks a lot Nando !! > > I will be building a prototype of the system . > > I will build my own turbine I saw where someone > > mentioned actually making a turbine from bamboo . > I > > beleive the effeciency will be considerably lower > than > > if I had used a commercially available product. > > I will keep you updated > > > > --- HYDRO <[EMAIL PROTECTED]> wrote: > > > >> Wayne: > >> > >> The velocity of a flowing water is determined by > the > >> head ( the difference > >> between to heights when the water is piped > between > >> both points). > >> > >> The water velocity = meter/sec= squreroot( 2 * > >> Head(meter)*9.81(gravity)) > >> > >> GROSS WATTS = Volume(liter/sec) * Head(meter) * > >> 9.81(gravity) > >> > >> Then you need to multiply by the efficiencies of > the > >> turbine and the > >> generator to reach the final output power that > for > >> small hydros, it looks > >> around 0.6 to 0.7 total efficiency multiplying > >> factor. > >> > >> Regards > >> > >> Nando > >> > >> > >> ----- Original Message ----- > >> From: "wayne burton" <[EMAIL PROTECTED]> > >> To: <[email protected]> > >> Sent: Sunday, October 16, 2005 3:25 PM > >> Subject: Re: [microhydro] Re: direct drive of > >> centrifugal pump by a turbine > >> > >> > >> > > >> > Hello ! > >> > Does anyone know how to increase the > >> velocity/force of > >> > flowing water without using a pump ? > >> > I need to create sufficient force to turn a > >> turbine ? > >> > I know without saying what kind of turbine it > >> might be > >> > a bit hard to give the best solution I just > need a > >> > general solution any available theory > application > >> > --- Joseph Hartvigsen <[EMAIL PROTECTED]> > wrote: > >> > > >> >> Nandi, > >> >> I've recently built a turbine and helped a > fellow > >> >> select a pump for > >> >> direct drive from the turbine. I haven't heard > >> yet > >> >> how it worked. In > >> >> principle there are a couple of issues to > >> consider. > >> >> First, a > >> >> centrifugal pump, unlike most generators, has > a > >> >> specified direction of > >> >> rotation. With a Pelton, there is no issue as > it > >> is > >> >> symmetric and can > >> >> be flipped over to change the direction of > >> rotation. > >> >> A turgo on the > >> >> other hand can also be turned over, but it > >> changes > >> >> the jet entrance > >> >> and exit faces. In the case of the turbine I > just > >> >> built for this > >> >> application this meant that the jet exit > needed > >> to > >> >> be on the pump > >> >> side. Normally I would prefer the other way so > >> that > >> >> it is easier to > >> >> keep water off the pump bearings. A Pelton > will > >> >> deflect water toward > >> >> the pump bearings no mater which direction of > >> >> rotation is required. > >> >> > >> >> The other factor is matching the torque vs. > rpm > >> >> curves of the pump and > >> >> turbine. With a pump, the torque increases > with > >> rpm. > >> >> With a turbine, > >> >> the torque is highest at 0 rpm and decreases > to 0 > >> >> torque at freewheel > >> >> rpm. Somewhere in the middle the two curves > >> >> intersect. That will be > >> >> the operating point. You need to match the > >> turbine > >> >> to the pump so that > >> >> that point of intersection is also at the peak > >> power > >> >> rpm of the > >> >> turbine. This rpm should also be a point > >> compatible > >> >> with matching the > >> >> pump's output head and flow to that required > by > >> your > >> >> application. > >> >> > >> >> The torque/power vs. rpm for the turbine can > be > >> >> computed with a > >> >> momentum balance. I have such a spreadsheet > for > >> any > >> >> impulse turbine on > >> >> my web site. Unfortunately, it is setup only > for > >> >> units of hp, ft-lb, etc. > >> >> See http://h-hydro.com/turgo_drive.html near > the > >> >> bottom of the page > >> >> > >> >> Most pumps are designed to be driven by an > >> electric > >> >> motor at 3600 or > >> >> 1800 rpm (assuming 60Hz, or 3000/1500 rpm at > 50 > >> Hz). > >> >> You should be > >> >> able to obtain a pump curve from the > >> manufacturer. > >> >> These pump curves > >> >> will likely be at 3600 or 1800 rpm. To scale > to a > >> >> different rpm, what > >> >> is knows as "turbomachinery affinity laws" are > >> used. > === message truncated === __________________________________ Yahoo! Music Unlimited Access over 1 million songs. Try it free. http://music.yahoo.com/unlimited/ ------------------------ Yahoo! Groups Sponsor --------------------~--> Get fast access to your favorite Yahoo! Groups. 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