Dear Steinman For this site you can use Kaplan or propeler turbine also cross flow ( Banki ) turbine. Dimitar --- steinaman <[EMAIL PROTECTED]> wrote: > > > Site evaluation - help wanted > (a folder by that name has been created for > reference) > Given this site, whats easist design to install and > maintain? > > An Engineering problem: > (I had posted this previously but got minimal > response. > I hope I simplified the description enough for more > feedback.) > I have a good site, but not enough > knowledge/experience to use it. > My 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. > This would serve a rural/suburban home about 100 > yards away which > currently uses about 1000 KWH per month. Would > prefer to 'offset or > feed the grid' at first and consider batteries at a > later date. > > 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 wier on > 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. (pics > in folder) > Water flows in at the top through trash rack and > exits from the base > thorugh a 24" concrete pipe running out of the > dam base. > > 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. > I have used wier calculations and the 108" > pereimeter to find the > flow varies from 0 to 1700 GPM. > Lets say it averages 600 over a year. > There is a 10' drop inside the concrete structure. > This is the maximum head I can achieve on my > property. > > 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? > (see folder's excel file 'Hydrocalc.xls') > In that file I calculate between 600 to 3200 > watts/sec (gross) > at low (300 GPM) to maximum(1700 GPM) flows. > > - which turbine type and placement gains most > from this setup? > Optimum solutions avoid draining the pond for > installation, > but that's not out of the question. > -do I construct a flow diversion to concentrate > woter flow over > a pelton turbine installed in bottom of wier > to gain the most > available head, or > -do I mount a flow through turbine at top, or > -do I adapt the outlet pipe to take power from > the concentrated > flow there. > -do I drill a pipe through base of wier to feed > nozzle(s) against > a pelton wheel installed down there with the > force applied by > 1 acre of pond surface 10 ' above. > -do I increase pressure and gained energy > output by channeling > the 108" of flow through a pipe or sluice to > the turbine? > or does channeling only help me attain the > maximum potential of > the calculations? > > Besides obvious differences in installation > logistics 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. > Feel free to send directed reply > ([EMAIL PROTECTED]) if you dont wish > to do broadcast posting. > > > > > > >
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