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]
> >
> >
> >
> >
> >
> >
> >
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>
>
>
>
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