Another possible method which might be useful if you want relatively short bursts of power and happen to like loud noises would be an overbalancing bucket arrangement. Clarrie Hall -----Original Message----- From: hwmdu [mailto:[EMAIL PROTECTED] Sent: Saturday, 4 December 2004 8:44 a.m. To: [EMAIL PROTECTED] Subject: [microhydro] Re: Intermittant flow with a siphon. How? Hi, thanks for comments, I think efficency is rather low. The banki is perhaps not the best and I am using an old car alternator. Also cable loss. I live above header tank. However its enough for washing machine, computer, TV, lights etc using ex-milk float batteries rewired to 12v. I don't need to wind up the generator in winter. Penstock is 2" internal diameter, not 4, sorry, and I think header tank is rather less than 500 gallons, it lasts for about half an hour. The banki inlet can be adjusted from about a quarter of the 2" pipe to full width of pipe. It doesn't make a huge difference to flow or power. I like ideas with toilet like systems, but am not sure how they work. I will try and find out. Brilliant suggestion! Thanks very much for that. It may even be possible to adapt one. If I could only get an intermittent siphon going?? Supposed to work ok for natural water springs. The system, especially the alternator needs quite a bit of power to just drive the field, before I get any power out. This summer the water pretty much dried up. The current nozzle adjustment range is not enough, and I would have to keep fiddling with it. Intermittent flow is automatic, and I think higher efficiency. Duncan. --- In [EMAIL PROTECTED], "JTDesign" <[EMAIL PROTECTED]> wrote: > > How about an elementary simple solution with > minimal moving parts and failure points! A > previous post suggested the toilet flapper valve > concept. About as simple as it can get and > pretty well mature as a technology! > > Now, instead of using the flush handle to > actuate it, how about some chain and a float. > Set the chain length so the float will actuate > the valve when the tank is almost full. > Elegant? Of course a float valve would have to > be fabricated to match the pipe size of the > penstock, but that would not be much of a chore. > > This concept requires no special sensors, > electronics, or other sophisticated components > and would almost never need maintenance. > > Have fun, > Jay > > > ----- Original Message ----- > From: "Nando" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Thursday, November 25, 2004 9:36 AM > Subject: Re: [microhydro] Re: Intermittant flow > with a siphon. How? > > > > > The solution for sporadic charging is to have a > pressure detector to > determine a full tank, then an auto valve to > open to charge, then detecting > the pressure empty tank level to close the > valve. > > What is needed is the Banki nozzle size and the > water usage at good water > flow -- and the low water available to see what > type of nozzle maybe needed > to run the Banki under these conditions-- for > possible full time usage and > not sporadic use. > > Regards > > Nando > > ----- Original Message ----- > From: "ReadFamily" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Thursday, November 25, 2004 9:26 AM > Subject: Re: [microhydro] Re: Intermittant flow > with a siphon. How? > > > > > > > > I think that the replies to this thread are > > getting away from the original > question. > > > > My understanding of the situation is this: > > When the water flow is adequate the Banki can > > be run full time (no > problem), but during dry spells the water flow > is not adequate so a scheme > was designed to store water in a 500 gallon tank > which would provide > intermittent full flow to run the Banki. > > The question is how to make this work. > > Initial attempt with a flexible pipe running > > into the side of the header > tank did not produce intermittent full flow, but > constant low flow. > > I dont have an answer - it sounds a bit like > > the solution could be along > the same lines as the flushing of a toilet. The > key thing is to have two > distinct states - no flow and full flow. If this > could be done with a > periodically fired flapper valve then that would > work, but maybe there is > some way to make a syphon system work where > there is no valve. Any ideas? > > > > Dominic Read > > Georgia, USA > > > > > > [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 > > > > > > > > > > > > > > > > > > > > > ------------------------ Yahoo! Groups > > 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 > > > [EMAIL PROTECTED] 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 ------------------------------------------------------------------------ CAUTION - This message may contain privileged and confidential information intended only for the use of the addressee(s) named above. If you are not the intended recipient of this message you are notified that any use, dissemination, distribution or reproduction of this message is prohibited; If you have received this message in error please notify the sender immediately via return email and erase all copies of this message and attachments. Any views expressed in this message are those of the individual sender and may not necessarily reflect the views of Rotorua District Council. ------------------------------------------------------------------------ ------------------------ Yahoo! Groups Sponsor --------------------~--> Make a clean sweep of pop-up ads. Yahoo! Companion Toolbar. Now with Pop-Up Blocker. Get it for free! http://us.click.yahoo.com/L5YrjA/eSIIAA/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. More information on micro hydropower at http://microhydropower.net To unsubscribe: send empty message to [EMAIL PROTECTED] Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/microhydro/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
