Given this site, whats easist design to install and maintain?
Hello all.
I joined just recently and have avidly followed the dialog re Daniel's
AC/DC site.
I share his inexperience and (i hope) enthusiasm to do something with
my land's potential.
I've saved copies of lots of instructive responses he got and need to
spend time absorbing the lessons therein.
Its an impressive amount of detail.
I'd like to introduce my 'problem' for input without diverting the
help you all are ready to give him, or repeating what's all transpired
in that dialog.
I can do my 'homework' re-reading those answers.
Any advice appreciated.
My first concerns are less to do with the electronics than with the
site 'engineering'.
How best to select the proper turbine, place it and channel flow to
it.
How to do it in a low impact, low cost and best ROI way with long life
and low maintenance.
Once that's more clear to me I can focus on the wiring issues.
DESCRIPTION: (in Northern Ct., USA)
A one acre manmade (1960s) pond, 17 ft at deepest, fed by two
streams,
which outlets through a vertical concrete wieron the dam side.
The dam is earthen, the wier is built like a fireplace/chimney
structure standing about 14 feet into pond from the dam base, which
is about 12' deep water at that point.
Water flows in at the top and exits from the base.
A pipe leads from chamber at bottom of wier through the base of
the dam to let stream flow continue past pond.
The 30"x24" trash grate at the top has a perimieter of 108".
All flow goes through that , nearly year round.
Flow over this varies from zero(some, not all Augusts) to 3" most
winters.
Lets say it averages 1".
There is a 10' drop inside the concrete structure.
Access to wier is a wooden bridge from earthen dam edge.
My land boundaries are the outer base of the dam and levelfrom the
points of stream entry. The wier is the only place to achive 'head',
and not much of it.
Here are my primary questions:
* is my math right? I am not sure the standard 'wier' calculations I
see, all illustrated as a board in a stream, apply here.
I.e. do I calculate flow potential correctly? Using the 1" average
spillover height....
-table lookup gives .72 CFS for 9'(108") at 1" or 325 GPM
-head is approx 10 ft.(no alowance for turbine height at this point)
-continueous watts = 325 GPM x 10ft / 10 constant = 325 watts
-kwh/M = 325GPM x 10Ft / 13.8 constant = 235 kwh/M
* do I increase pressure and gained output by channeling the 108" of
flow through a pipe or sluice to the turbine?
or does channeling only help me attain maximum potential still set
at 325 continuous watts?or 235 kwh/M?
* which turbine gains most from this setup?
-do I construct a flow diversion to concentrate water flow over a
pelton turbine installed in bottom of wier,
or
-do I mount a flow through turbine at top. If so, is the impeller
at top or bottom of tube? (I remain confused by readinge on
power of water dropping AFTER is passes through blades)
Besides obvious differences in installation logistics (possibly
requiring draining of pond to access wier base)are there major
tradeoffs in achieved output?
I think those are the most important issues for me to begin with.
thanks to all in advance.
------ crude text diagram follows -------
----dam top\
\
\\
\\^^^^^^^water level^^^^^^^^^^^^ \ /^^^^^^^
\\ [[[[wier grate ]]]
\\ [[[ ]]]
\\ [[[ F ]]]
\\ [[[ L ]]]
\\ [[[ O ]]]
\\ [[[ W ]]]
\\ [[[ ]]]
\\ [[[ | ]]]
\\ [[[ V ]]]
\\ [[[ V ]]]
O<<____________<<<_______outflow pipe__OOOOOOO<<OOOO ]]]
[[[[[[[[[[]]]]]]]]
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