Wayne: Supercapacitors are of limited use right now, the industry needs to improve them in voltage and current capabilities, also too expensive for small alternative energy work.( my point of view)
Nando ----- Original Message ----- From: "wayne burton" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Tuesday, October 18, 2005 5:06 PM Subject: Re: [microhydro] Re: direct drive of centrifugal pump by a turbine > 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. 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