your caculations are correct. I know that I have a very low amount of power system. I suspect that the pressure is well over 30psi. I will have to check that value. It was nothing more than an estimate at this point, it is probably well above that value, closer to 80psi, but until i get a hard value I will let you know. I will get an accurate pressure reading on the system and get back to you. I remeasured the flow at 3gpm. I do not intend on the system being capable of powering much. It is much more intended to just sit and charge a lead acid battery. Thanks for the input and the math. Upon getting more accurate system values I will get back to you all. Thanks for the input. Rick
HYDRO <[EMAIL PROTECTED]> wrote: Rick: 2 GPM = 0.126 liter/sec 30 PSI = 69.28 feet = 21.1 meters The gross energy available is Watts= liter/sec * Head(meters) * gravity (9.81) Watts = 0.126 * 21 * 9.81 = 26 watts BUT We need to consider efficiencies and for such small system you may get around 45 % ( may be 40 %) for a total of 26 * 0.45 = 11.7 watts I am wondering if you made a mistake with the water volume, since you are planning to use a Francis Turbine or even a Pump in reverse mode. You may, as well, forget about the pump, the parameters for a pump are critical and your site is well "UNDER critical". So, can you clarify your parameters and your plans, as well ? Nando ----- Original Message ----- From: "Rick" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Saturday, October 22, 2005 9:32 PM Subject: [microhydro] low flow med-high pressure turbine? what to use? > Greetings, > I will admit that I am fairly new to this list but I have an > interesting supply. I have the ability to get a water stream at > about 2-3 GPM but at about 30PSI (sometimes higher if the rains have > been good like they have this past month, which is bad for hiking, > but whatever). I am a mechanical engineer and am planning on setting > up a small, portable unit for charging up some 12v lead acid > batteries off of it. > > Most of the online documentation I have seen regards high flow rates > but low head pressures. I am at the other end of the spectrum, I > have a pretty decent pressure but very low flow. I am guessing that > I will be able to use either a francis turbine or a impulse turbine > of some sort. > > Then I am planning on at least starting with a DC motor and using > that as a generator. I will work on the electronics in the near > future but right now I have to figure out what type of turbine to > use. The cheapest and maybe the most easily obtained turbine of this > sort would actually be a centripetal pump used as a turbine. I have > found a few websites discussing this setup, however they are all on > a large flow rate. > > Since this low flow higher pressure is abnormal I haven't been able > to find much to go off of. What would you guys (and gals) suggest I > use as a turbine? I really don't know, Sort of going out and trying > out all kinds of different centripetal pumps I am not sure where to > start, or even look. > > Any turbine help or suggestion would greatly be appreciated! thanks > a lot! > > Rick > > > > > > > > > > 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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