Hi, From the Hurricane State of Florida, Here's our low-head waterwheel at the Florida Institute of Technology in Melbourne. http://my.fit.edu/~fleslie/Conventional/Hydro/GardensWheel/waterwheel.htm
I need a trash deflector, but it turns at some 50-60 rpm. The diameter is two feet and it is two feet wide. The spillway is some 27 inches high, thus I designed it for small diameter. The attaching structure resists floating the wooden wheel when storm water floods the area. Frank Leslie --- |=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-| | Frank R. Leslie | Florida Tech email: mailto:[EMAIL PROTECTED] | | Florida Tech, 150 W. University Blvd., Melbourne FL 32901, DMES, Rm. 104 | | (321) 674-7377 | http://my.fit.edu/~fleslie/ (Renewable Energy) | | | | Home: 1017 Glenham Drive, NE, Palm Bay FL 32905-4855 | (321) 768-6629 | | Home email: mailto:[EMAIL PROTECTED] | 28-01.3130N / 80-35.6136W | | www.geocities.com/windy4us (Wind Energy Experimenters) | KD4EYQ 020912 | -----Original Message----- From: Michael Lawley [mailto:[EMAIL PROTECTED] Sent: Thursday, September 16, 2004 4:30 PM To: [EMAIL PROTECTED] Subject: Re: [microhydro] Archimedes Screw Micro Hydro Hi All, This probably sounds a little outdated, for low head schemes where the issues are: fish passage, flooding, debris, large flow variations - we install water wheels. If anybody is interested in pictures of the set up for a small 1.8m wheel, coupled to a Smart Drive email me and I can send some pictures. It can do up to 500 W but most of the time runs at about 200 Watts dropping down to 100 during low summer flows. It cost very little to make and has been very reliable. The high output at low rpm of the Smart Drive means that a simple gearbox from motorcycle chain can be made cost effectively. Conversion efficiency is around 50% which for a low head low power scheme with a 30:1 gearbox ratio is good. We recently ventured into using a PowerPal propeller turbine at a 1.8m site but immediately had the problem with debris, fish and turbine performance problems. It cost much more to engineer a solution to these than the gearbox of the water wheel. During floods the wheel runs nearly half submerged still at about half full output power. I'm not aware of any other device able to overcome all these issues. Regards Michael Lawley Renewable Energy Engineer EcoInnovation 671 Kent Road R.D.1 New Plymouth New Zealand Phone: (NZ) 06 752 2765 Web site: www.ecoinn.co.nz email: [EMAIL PROTECTED] ----- Original Message ----- From: davidrichardmann To: [EMAIL PROTECTED] Sent: Thursday, September 16, 2004 9:30 PM Subject: [microhydro] Archimedes Screw Micro Hydro Dear Mr Thomas K�hli I read with interest the infomation about your micro hydro plant in Switzerland using an archimedes screw. I have never heard of this being used before, and am curious as to why it was chosen. Efficiency at low head? Fish protection? Cost? Do you have any more details of the project available? I am looking at ways to install a low head scheme (1.8m) in a river where fish protection is a major problem. What I really need is a machine that will extract the water power efficiently, whilst still permitting the safe passage of small fish through the unit! 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