Hi Bruce,
It's a question of efficiency. I would suggest that any in water turbine would struggle to get a conversion efficiency above 20%, more 10-15%. You will have problems with grass, twigs and leaves wrapping around the blades. If I assume you can get 1.5m drop and 20 L/s, you can get 150 Watts from a small water wheel driving a smart drive at 200 ish rpm. You would need to increase the wheel speed about 10-15 fold which you can do with the belt drive and pulley out of the back of a domestic dryer. The good thing about wheels is they do not clog with debris, let it all go over, do not harm fish and can take vary flows without adjustment. You can make one yourself using metal spouting/guttering and the wheel you can fabricate onto a car wheel rim. Use the half shaft in plumber block bearings as the drive and mount on the end your pulley drive from the dryer and mount the PMG generator above away from the flood waters. Based on my experience that's what I would do on such a marginal site. An instream turbine on the same site would only do about 50 Watts due to the lower conversion efficiency. I can send some pics if you email me directly. The submersible generators have their applications where you naturally have fast deep flowing water an all you need to do is drop it in the flow. Michael Lawley Renewable Energy Engineer EcoInnovation EcoInn/EcoBach 671 Kent Road R.D.1 New Plymouth New Zealand Phone: (NZ) 06 752 2765 Fax: (NZ) 06 7522768 Web site: www.ecoinn.co.nz email: [EMAIL PROTECTED] ----- Original Message ----- From: [EMAIL PROTECTED] To: [email protected] Sent: Sunday, January 30, 2005 9:44 AM Subject: [microhydro] Acqair Submersible Generator Hello. Has anyone out there has experience with the Acqair submersible generator? Apparently they have been used successfully mounted on the substructure of oil rigs. My idea is to build a dam in a stream that does not have a whole lot of head on my land but flows fairly consistently at about 5 to 10 gallons (and more during rains)per second. I figure that by funneling the flow through the Acqair's prop into a 12 inch outlet I should easily be able to create 7-8 MPH or more of flow regularly. The dam site is a natural formation and should not take TOO much work, and it is within 200 feet of our new homesite, so transmission to the inverter is possible without too much line loss. We are thinking about the 24V model. The other large concern is creating an adequate anti-rock cage, as the stream is prone to occassional extreme flodding in times of heavy rains. Any other feedback about possible hydeo power generation on this site would be greatly appreciated! Many Thanks, Bruce 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 a.. To visit your group on the web, go to: http://groups.yahoo.com/group/microhydro/ b.. To unsubscribe from this group, send an email to: [EMAIL PROTECTED] c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. [Non-text portions of this message have been removed] ------------------------ Yahoo! Groups Sponsor --------------------~--> In low income neighborhoods, 84% do not own computers. At Network for Good, help bridge the Digital Divide! http://us.click.yahoo.com/EA3HyD/3MnJAA/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! 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 <*> To visit your group on the web, go to: http://groups.yahoo.com/group/microhydro/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
