>>
>> > Ulysses wrote:
>> >
>> >> On your web site it suggested pumping in 25 foot stages. Have you
>> >> actually
>> >> pumped water 25 feet up or do you have some documentation showing it
>> >> being
>> >> done? Is the total head based upon the heat differential or some
>> >> other
>> >> factor? Everything I found online was limited to perhaps four or five
>> >> feet
>> >> of head.
>> --
>>
>> While there could be a number of reasons to go in the
>> direction you are describing, I wonder how the costs
>> would compare with just using a normal solar powered
>> well pump?
> To me the appeal of something like the fluidyne pump would be the lack of
> needed maintenance. If the mirrors and/or collectors need to be replaced
> avery few years then I don't really see what the advantage is over a
> solar-powered pump. My understanding is that the DC type need to have the
> brushes replaced periodically and they generally have low flow rates but
> the
> photovoltaic panels seem to last decades.
> If someone happens to have a good creek with a good flow rate and also
> happens to have a substantial hill it would be possible to produce a small
> amount of hydro power by using a RAM pump to fill an elevated
> tank/reservoir
> but RAM pumps only pump about 1/4 of the water that goes through them.
Or you could use a waterwheel to power a pump. This could be useful
for providing a pressurized water supply, from such a source. It might be
that it could be sized to allow raising sufficient water to provide for
power
generation during no wind or no sun periods. Or to fit a particular power
utilization cycle. A small amount of water continuously added, can build
up, allowing for the extraction of a greater amount of water ( that can do
a significant amount of work) over a shorter period of time.
> I
> think what I need is some kind of anti-gravity pump that doesn't waste any
> water. I managed to get water to exceed it's own level by simply adding a
> weighted float to the top of a bucketful of water. The water flowed down
> a
> hose and back into the bucket. The problem with this, as far as hydro is
> concerned, is the water doesn't flow fast enough to do any good. Now I
> just
> need to figure out how to defy some more laws of physics ;-)
>
> Ulysses wrote:
> > On your web site it suggested pumping in 25 foot stages. Have you
actually
> > pumped water 25 feet up or do you have some documentation showing it
being
> > done? Is the total head based upon the heat differential or some other
> > factor? Everything I found online was limited to perhaps four or five
feet
> > of head.
> There's a hard limit on how high water can be _pulled_. At some point
> (more than 25 feet and less than 30) you'll pull a vacuum. You can
> _push_ water as high as you have the muscle to apply as long as the
> pump/pipe hardware holds together.
I was thinking more along the lines of lifting the water from ground
level--each pump in the series would empty into a tank with the pump
attached to the bottom so it wouldn' have to "pull" the water at all.
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>> > Ulysses wrote:
>> >
>> >> On your web site it suggested pumping in 25 foot stages. Have you
>> >> actually
>> >> pumped water 25 feet up or do you have some documentation showing it
>> >> being
>> >> done? Is the total head based upon the heat differential or some
>> >> other
>> >> factor? Everything I found online was limited to perhaps four or five
>> >> feet
>> >> of head.
>> --
>>
>> While there could be a number of reasons to go in the
>> direction you are describing, I wonder how the costs
>> would compare with just using a normal solar powered
>> well pump?
> To me the appeal of something like the fluidyne pump would be the lack of
> needed maintenance. If the mirrors and/or collectors need to be replaced
> avery few years then I don't really see what the advantage is over a
> solar-powered pump. My understanding is that the DC type need to have the
> brushes replaced periodically and they generally have low flow rates but
> the
> photovoltaic panels seem to last decades.
> If someone happens to have a good creek with a good flow rate and also
> happens to have a substantial hill it would be possible to produce a small
> amount of hydro power by using a RAM pump to fill an elevated
> tank/reservoir
> but RAM pumps only pump about 1/4 of the water that goes through them.