steinaman:
Still your comments are not clear. I can not access your folder, I do not have a Yahoo account .Send it to me directly, I can take large files. You put technical info that stop others in responding to you. HOW do you empty the pond, be specific and clear, step by step. You are not clear abut the trash perimeter and what is the wet perimeter and the wet area and water velocity there to allow volume calculations. Describe the site carefully and in detail. You have 12 feet=3.6 meters, depth and a volume from zero to 1700 GPM = 107 LITER/SEC This info says that you can get 2.16 KW Maximum. ( Gross 3.78 KW) You also said that you do not have anymore head in your property but you have not described the site going away from the pond, since you acknowledge ignorance then you need to give more info. NOW give info for the two streams that feed the pond, their volume and the head for each one and the length from the pond to the source ( top of your land ) --- It may be an alternate solution Forget a Pelton, head is too low, even for a Turgo, Propeller may be the solution. but ideally would be to have a pipe from the bottom of the pond Regards Nando ----- Original Message ----- From: "steinaman" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Monday, April 04, 2005 11:08 AM Subject: [microhydro] Site evaluation - advice wanted > > > > 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. > > > > > > > > > > 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 > > > > > > > ------------------------ Yahoo! Groups Sponsor --------------------~--> Has someone you know been affected by illness or disease? Network for Good is THE place to support health awareness efforts! http://us.click.yahoo.com/RzSHvD/UOnJAA/79vVAA/FGYolB/TM --------------------------------------------------------------------~-> 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! 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