Dear Ender Nadir
Let me see if I can help you. Please send the drawings of Spillway Flap Gate
Yash
----- Original Message -----
From: <[email protected]>
To: <[email protected]>
Sent: Wednesday, October 19, 2005 7:31 AM
Subject: [microhydro] Digest Number 1266
There are 11 messages in this issue.
Topics in this digest:
1. Spillway Flap Gate Manufacturer
From: "endernadir" <[EMAIL PROTECTED]>
2. Re: auto alternator brush life--response to Oso's comment
From: Max Klohn <[EMAIL PROTECTED]>
3. Re: Newbie with 4 feet of head and 600 GPM - sugestions?
From: "mengelmar" <[EMAIL PROTECTED]>
4. Re: Re: protect bamboo
From: Larry Shine <[EMAIL PROTECTED]>
5. MITCHELL-BANKI: COST / kW
From: "Orlando A. AUDISIO" <[EMAIL PROTECTED]>
6. Re: Re: protect bamboo
From: wayne burton <[EMAIL PROTECTED]>
7. Re: Re: direct drive of centrifugal pump by a turbine
From: wayne burton <[EMAIL PROTECTED]>
8. Re: Re: direct drive of centrifugal pump by a turbine
From: wayne burton <[EMAIL PROTECTED]>
9. Re: Newbie with 4 feet of head and 600 GPM - sugestions?
From: "Brian White" <[EMAIL PROTECTED]>
10. Re: auto alternator brush life--response to Oso'scomment
From: "Doug Lux" <[EMAIL PROTECTED]>
11. [Fwd: Dear Sir,]
From: Wim Jonker Klunne <[EMAIL PROTECTED]>
________________________________________________________________________
________________________________________________________________________
Message: 1
Date: Tue, 18 Oct 2005 08:06:51 -0000
From: "endernadir" <[EMAIL PROTECTED]>
Subject: Spillway Flap Gate Manufacturer
Dear members
I request some sort of information about Spillway Flap Gates.
I immediately need a detailed application file of this type of Flap
Gates.
I will be grateful for any kind of support about my inquiry
Thanks a lot for your concern
Best regards
Ender Nadir
P.S: I do have a detailed drawing of this type of flap gate, if it is
requested I can supply the drawings also.
________________________________________________________________________
________________________________________________________________________
Message: 2
Date: Tue, 18 Oct 2005 08:53:52 -0300
From: Max Klohn <[EMAIL PROTECTED]>
Subject: Re: auto alternator brush life--response to Oso's comment
Because you do not run your car 24 hours a day, 7 days a week, for
months and years.
Local experience with battery charger peltons is that brushes wear in
about 3 - 4 months with the internal charge regulator (which cuts off
induction current at full battery charge and causes the turbine to spin
at nearly VJet) and 8 - 10 months with resistive field currrent control
and constant turbine speed.
Max
Le lundi 17 octobre 2005 à 15:54 -0700, davis ron a écrit :
> That is the same thing I was thinking after
> reading Oso's comment. I have only had alternator
> failure a couple of times over 30 plus years of
> driving. Wny would they wear out so much faster when
> used with microhydro?
>
> --- Radu Babau <[EMAIL PROTECTED]> wrote:
>
> > Hello Oso,
> >
> >
> > You are saying that:
> >
> > > Most alternators are rated at 6000 rpm, so it
> > should produce the full
> > > 70 amps. You do need to subtract the excitation
> > current from that, so
> > > I would not count on anything above 65 amps.
> > >
> > > Spinning it at that speed, the brushes are not
> > going to last very
> > > long, 6-8 weeks would be my guess. If you cut the
> > speed to about 3000
> > > rpm, the alternator should still produce 50-55
> > amps and the brushes
> > > will last a little longer, say 12-16 weeks.
> >
> > I am wondering about this 12-16 weeks brushes life
> > time. Some of us have
> > cars which we mostly ride in the city, 90% of their
> > life time, on which the
> > normal motor speed is something from 1000-3000
> > rpm's. Usually there is
> > something like 1.5 ratio between the alternator and
> > motor shaft. Other
> > people are mostly using their cars to run on
> > highways, which means 2000-5000
> > rpm motor speed. In both cases the life time of a
> > alternator (including
> > brushes) is at least 5 years, even more. It is that
> > kind of equipment that
> > you only change once during a normal car lifetime.
> >
> > Am I wrong ? Am I right ?
> >
> >
> > Radu
> >
> >
> >
> >
>
>
>
>
>
> __________________________________
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>
>
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________________________________________________________________________
________________________________________________________________________
Message: 3
Date: Tue, 18 Oct 2005 12:49:28 -0000
From: "mengelmar" <[EMAIL PROTECTED]>
Subject: Re: Newbie with 4 feet of head and 600 GPM - sugestions?
Does anyone have any thoughts on using a ram in situations like this
in order to multiply the head pressure available? I can't sort out
in my mind whether there would be anything to be gained or whether
there would be simply too many inefficiencies all pile on top of
each other.
Andy- I have a similar site in Maine that I am contemplating. A
waterwheel setup is very tempting since I am not that interested in
maximizing my efficiency but would like something that looks nice
and that I can fabricate myself. As I am on the grid already I'd be
looking at the possibility of a grid-tie system.
> ----- Original Message -----
> From: "lecomte381" <[EMAIL PROTECTED]>
> To: <[email protected]>
> Sent: Friday, October 14, 2005 10:31 AM
> Subject: [microhydro] Newbie with 4 feet of head and 600 GPM -
sugestions?
>
>
> > The pond and stream in the back yard have a variable flow.
Strong in
> > spring and fall, almost dry in late summer, winter is hard to
calcuate
> > in New England.
> > A 12 volt battery storage system heating water for home heat as
well
> > as domestic use would be very nice.
> > An overshot water wheel driving an automotive alternator was my
> > thought but I am sure there are better, more efficient options.
I was
> > told that I might see 8+ amps at 14.5 volts from this average
flow.
> >
> > Ecomomical sugestions would be greatly appreciated.
> >
> > Thanks
> > Andy Brown
> >
> >
> >
> >
> >
> >
> >
> >
> > 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
> >
> >
> >
> >
> >
> >
> >
> >
>
________________________________________________________________________
________________________________________________________________________
Message: 4
Date: Tue, 18 Oct 2005 07:45:30 -0700 (PDT)
From: Larry Shine <[EMAIL PROTECTED]>
Subject: Re: Re: protect bamboo
Hi Nando,
I was intrigued by your comment...
> (your father) Taught how to carry water for long distances using Bamboo
> aqueducts, how to
> protect the Bamboo for long lasting,
I use 8' bamboo poles in my garden. they last about 3 years without
protection... what did your
father do to protect them ?
thanks
(best you reply directly to not distract microhydro group!)
Email: [EMAIL PROTECTED]
phone: 860-693-1673 (Home office)
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Message: 5
Date: Tue, 18 Oct 2005 14:55:14 -0300
From: "Orlando A. AUDISIO" <[EMAIL PROTECTED]>
Subject: MITCHELL-BANKI: COST / kW
>
>Dear members
>I request some information about te specific cost (U$S/kW) on
>Mitchell-Banki Turbine, name of hydropower station.
>I will be grateful for any kind of support about my inquiry
>Thanks a lot for your concern
>Best regards
Ing. Orlando Anibal AUDISIO
UNIVERSIDAD NACIONAL DEL COMAHUE
Fac. de Ingenieria
Dpto. de Mecánica Aplicada
Lab. de Máquinas Hidráulicas (LA.M.HI.)
Calle Buenos Aires 1400
(Q8300BCX) NEUQUEN ARGENTINA
TE: 54-299-4490 300 Int. 404
FAX:54-299-4422 836
--
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Checked by AVG Anti-Virus.
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________________________________________________________________________
________________________________________________________________________
Message: 6
Date: Tue, 18 Oct 2005 14:40:31 -0700 (PDT)
From: wayne burton <[EMAIL PROTECTED]>
Subject: Re: Re: protect bamboo
Please share that info Nando it sounds very
interesting .
--- Larry Shine <[EMAIL PROTECTED]> wrote:
>
> Hi Nando,
> I was intrigued by your comment...
>
> > (your father) Taught how to carry water for long
> distances using Bamboo aqueducts, how to
> > protect the Bamboo for long lasting,
>
>
> I use 8' bamboo poles in my garden. they last about
> 3 years without protection... what did your
> father do to protect them ?
>
> thanks
> (best you reply directly to not distract microhydro
> group!)
>
> Email: [EMAIL PROTECTED]
> phone: 860-693-1673 (Home office)
>
>
>
>
> __________________________________
> Yahoo! Mail - PC Magazine Editors' Choice 2005
> http://mail.yahoo.com
>
>
>
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________________________________________________________________________
Message: 7
Date: Tue, 18 Oct 2005 14:59:44 -0700 (PDT)
From: wayne burton <[EMAIL PROTECTED]>
Subject: Re: Re: direct drive of centrifugal pump by a turbine
Hi Nando I am impressed by the level of knowledge you
have If you have written a book on these things please
tell me where to find it .
I remember someone telling me once that to increase
water pressure flowing through a hose he reducrd the
size (diameter )of the hose for every couple of feet
.oes this sound practical to you ?
--- 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.
>> >> These laws help
>> >> scale a geometrically similar design to a larger
>> or
>> >> smaller size, or
>> >> scale the performance of a fixed unique device
as
>> >> head, flow, rpm,
>> >> power, etc. need to be changed. In the recent
>> case I
>> >> helped with, he
>> >> was eventually able to find a 1200 rpm pump that
>> >> matched his needs,
>> >> but it was a custom industrial pump.
>> >>
>> >> This link has some info, but you can google
>> >> "turbomachinery affinity
>> >> laws" and find dozens of referrences.
>> >>
>> >
>>
>
http://caltechbook.library.caltech.edu/22/01/chap1.htm
>> >> For the same pump run under different conditions
>> "D"
>> >> or the
>> >> characteristic diameter (usually the impeller or
>> >> runner diameter) is
>> >> fixed, and flow varies with rpm (double rpm
>> doubles
>> >> flow capacity),
>> >> Head varies with rpm^2 (double rpm = 4x head)
and
>> >> the same for torque.
>> >> Power varies as rpm^3. So if you have a pump
>> rated
>> >> at 1800 rpm and run
>> >> it at 1400 rpm, its flow is reduced to 78%, head
>> &
>> >> torque to 60% of
>> >> the 1800 rpm value, and power is reduced to 47%
>> of
>> >> the rated power.
>> >>
>> >>
>> >> Joe
>> >>
>> >>
>> >> --- In [email protected], "S.N.Group of
>> >> Companies"
>> >> <[EMAIL PROTECTED]> wrote:
>> >> >
>> >> > hi all!!!!
>> >> >
>> >> >
>> >> > has any bodythought of using turbines to drive
>> >> centrifugal pumps
>> >> > directly??
>> >> > we are currently working on a concept wherein
>> the
>> >> turbine shft will be
>> >> > directly connected to the drive shaft of a
>> >> centrifugal pump . providing
>> >> > flow all year round .
>> >> > any help in this matter is solicited.
>> >> >
>> >> > regards,
>> >> > nandi
>> >> >
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >
>> >
>> >
>> >
>> > __________________________________
>> > Yahoo! Music Unlimited
>> > Access over 1 million songs. Try it free.
>>
> === message truncated ===
>
>
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Message: 8
Date: Tue, 18 Oct 2005 15:06:44 -0700 (PDT)
From: wayne burton <[EMAIL PROTECTED]>
Subject: Re: 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 ===
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Message: 9
Date: Wed, 19 Oct 2005 03:58:30 -0000
From: "Brian White" <[EMAIL PROTECTED]>
Subject: Re: Newbie with 4 feet of head and 600 GPM - sugestions?
If you just want heat, perhaps you can connect your turbine to a
device with something spinning in heavy oil. You get heat from the
viscous liquid moving. People have done this in the past. It is very
simple but you need the device close to the house or greenhouse that
you heat.
Brian
--- In [email protected], "HYDRO" <[EMAIL PROTECTED]> wrote:
>
> Andy:
>
> The site needs a very careful set up, this due to the very low head.
>
> Due to the low head, the most practical turbine would be a propeller
to
> attain high RPM from the beginning, the second type would the Banki
Turbine.
>
> The idea of a car alternator is not practical, because it is very
> in-efficient and needs a very high RPM to generate the necessary
power.
>
> You have not stated the distance from the turbine site to the load
placement
> to define generator type, as well as, the best generated voltage.
>
> Your site 4 feet=1.2 Meters and 600 GPM= 37.8 liter/sec may produce
around
> 250 Watts if a very careful system design is done -- the final
available
> power depends on the turbine and generator efficiencies.
>
> Detail the water volume available power during the Wet season to
take in
> account the extra available power during those periods that may be
> advantageous to you.
>
> A PMA brushless motor converted to a generator maybe the best
generator for
> you.
>
> Regards
>
> Nando
> ----- Original Message -----
> From: "lecomte381" <[EMAIL PROTECTED]>
> To: <[email protected]>
> Sent: Friday, October 14, 2005 10:31 AM
> Subject: [microhydro] Newbie with 4 feet of head and 600 GPM -
sugestions?
>
>
> > The pond and stream in the back yard have a variable flow. Strong
in
> > spring and fall, almost dry in late summer, winter is hard to
calcuate
> > in New England.
> > A 12 volt battery storage system heating water for home heat as
well
> > as domestic use would be very nice.
> > An overshot water wheel driving an automotive alternator was my
> > thought but I am sure there are better, more efficient options. I
was
> > told that I might see 8+ amps at 14.5 volts from this average
flow.
> >
> > Ecomomical sugestions would be greatly appreciated.
> >
> > Thanks
> > Andy Brown
> >
> >
> >
> >
> >
> >
> >
> >
> > 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
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> > endorse products or support the advertisements in any way.
> >
> > More information on micro hydropower at http://microhydropower.net
> >
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> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> >
>
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Message: 10
Date: Tue, 18 Oct 2005 16:19:49 -0700
From: "Doug Lux" <[EMAIL PROTECTED]>
Subject: Re: auto alternator brush life--response to Oso'scomment
for what ever its worth....
I run 3 harris pelton turbines here that are rewound ford alt's for 48v. I
have removed the internal bridges and installed external ones...much better
air flow for cooling. I have replaces the standard brushes with the heavy
duty round ones and now I only change them once a year. Cant quite get two
years out of them, so I just change them at the start of every season. the
comms have to be changed everyother year.
doug
----- Original Message -----
From: "Max Klohn" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Tuesday, October 18, 2005 4:53 AM
Subject: Re: [microhydro] auto alternator brush life--response to
Oso'scomment
> Because you do not run your car 24 hours a day, 7 days a week, for
> months and years.
> Local experience with battery charger peltons is that brushes wear in
> about 3 - 4 months with the internal charge regulator (which cuts off
> induction current at full battery charge and causes the turbine to spin
> at nearly VJet) and 8 - 10 months with resistive field currrent control
> and constant turbine speed.
>
> Max
>
> Le lundi 17 octobre 2005 à 15:54 -0700, davis ron a écrit :
>> That is the same thing I was thinking after
>> reading Oso's comment. I have only had alternator
>> failure a couple of times over 30 plus years of
>> driving. Wny would they wear out so much faster when
>> used with microhydro?
>>
>> --- Radu Babau <[EMAIL PROTECTED]> wrote:
>>
>> > Hello Oso,
>> >
>> >
>> > You are saying that:
>> >
>> > > Most alternators are rated at 6000 rpm, so it
>> > should produce the full
>> > > 70 amps. You do need to subtract the excitation
>> > current from that, so
>> > > I would not count on anything above 65 amps.
>> > >
>> > > Spinning it at that speed, the brushes are not
>> > going to last very
>> > > long, 6-8 weeks would be my guess. If you cut the
>> > speed to about 3000
>> > > rpm, the alternator should still produce 50-55
>> > amps and the brushes
>> > > will last a little longer, say 12-16 weeks.
>> >
>> > I am wondering about this 12-16 weeks brushes life
>> > time. Some of us have
>> > cars which we mostly ride in the city, 90% of their
>> > life time, on which the
>> > normal motor speed is something from 1000-3000
>> > rpm's. Usually there is
>> > something like 1.5 ratio between the alternator and
>> > motor shaft. Other
>> > people are mostly using their cars to run on
>> > highways, which means 2000-5000
>> > rpm motor speed. In both cases the life time of a
>> > alternator (including
>> > brushes) is at least 5 years, even more. It is that
>> > kind of equipment that
>> > you only change once during a normal car lifetime.
>> >
>> > Am I wrong ? Am I right ?
>> >
>> >
>> > Radu
>> >
>> >
>> >
>> >
>>
>>
>>
>>
>>
>> __________________________________
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>>
>>
>>
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>>
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>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
>
>
>
>
> 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
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________________________________________________________________________
Message: 11
Date: Tue, 18 Oct 2005 23:57:37 +0100
From: Wim Jonker Klunne <[EMAIL PROTECTED]>
Subject: [Fwd: Dear Sir,]
Dear group members,
Please see a message by Jill Atkinson below.
Answers to Jill directly at [EMAIL PROTECTED], c.c. to the group
when relevant.
Kind regards,
Wim Jonker Klunne
group moderator
-------- Original Message --------
Subject: Dear Sir,
Date: Fri, 14 Oct 2005 18:53:11 +0100
From: Jill Atkinson <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Dear Sir,
I am currently carrying out a second year engineering project on
microhydro turbines and I would be very grateful for anything you could
point me to on the question of their care and maintenance.
Yours,
Jill Atkinson
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