help with hydro site calcs [RE-wrenches]

[Steve Willey, Backwoods Solar]

The actual flow taken will be determined by the nozzle size used and that
limited by friction loss of head in the pipe.  I doubt they would understand
using a larger than allowed pipe with the explanation that the nozzle
restricts flow to 80 gpm and the 4 inch pipe is just to avoid friction. Such
an arrangement would be fair if he can get a gallon figure quoted from the
authority granting a 2 inch pipe.  However they probably don't trust that it
will be nozzled down as that would not be the case in irrigation.

A 2 inch pipe about 700 feet long with 60 feet head would lend itself to a
Harris unit using in the neighborhood of 50 gpm, accepting a 10 foot head
loss to friction in that 2" pipeline. This would produce 200 -225 watts
output with probably 2 nozzle unit between 3/8 and 1/2 inch nozzle size
range.

If you can get them to agree to use a larger pipe and accept 4 nozzles of
that size as flow restriction rather than pipe size, you could more than
double the power produced.  However 200 watts full time is very usable for
an efficiently designed home.  Don Harris could give a closer estimate and
instruction, but unfortunately is not on line yet.

Steve Willey   www.backwoodssolar.com
Backwoods Solar Electric Systems
A catalog business on a mountain
2 miles from utility lines,
powered entirely by our catalog products.
IF UTILITY POWER IS 1/2 MILE OR MORE FROM YOUR SITE,
get our free 160 page solar-electric Planning Guide/Catalog.
(Your postal address required - Our list is never given or sold).
Phone(208)263-4290  Fax (208) 265-4788  in Idaho, USA


----- Original Message -----
From: Todd Cory, Bald Mt. Solar <toddcory at jps.net>
To: <RE-wrenches at topica.com>
Sent: Thursday, September 07, 2000 6:41 AM
Subject: help with hydro site calcs [RE-wrenches]


> Hi List,
>
> I am needing some information on sizing a hydro installation. Generally
one
> knows the available flow in GPM, but this situation is a bit different.
The
> customer has water rights off a ditch to "take up to a 2" pipe's worth of
> water". Running 675' of 2" PVC, he will have 60' of head.
>
> I need to know what kind of maximum flow will run through a 2" pipe. I
can't
> seem to find any charts listing this. Once I know that, I can figure
friction
> loss and estimate the net pressure available at the generator site.
>
> Also is there an easy to figure estimated output in watts knowing net head
and
> flow? I need to size the Harris and delivery wire.
>
> Thanks in advance.
>
> Todd
>
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For info contact list moderator by email:
 michael.welch at homepower.com
___________________________________________________________
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