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Return to: Hydro Power |
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#Post#: 5949-------------------------------------------------- |
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Hydrocat turbine |
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By: rrattink Date: May 10, 2015, 2:58 pm |
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I'm looking for a system to produce 12v power for river |
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prospecting and I found the hydrocat online. It's two hulls with |
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a waterwheel between them running a generator. The concept is |
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very simple and I have many possible ideas to improve it for my |
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needs but my challenge is the alternator. The water is at |
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relatively constant speed 24hrs a day with moderate flow changes |
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for seasonal influences such as rainfall or snowmelt as compared |
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to wind speed or solar. I have a spool of 24 gauge wire and |
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would most likely have a pma at both ends of the cross axle to |
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double the output. My question is what kind of pma would suit |
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this application given my wire size and slower waterwheel rpms? |
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Any input would be appreciated. I have n52 neos as well.. |
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#Post#: 5957-------------------------------------------------- |
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Re: Hydrocat turbine |
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By: lynx wind Date: May 11, 2015, 10:07 am |
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Power is roughly speaking rpm x torque. With water you may have |
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a lot of torque and low rpm. The PMA just needs to be purpose |
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built. It may also be possible to gear up to get higher rpm |
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which is a benefit. I'l help you design if you can collect |
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some rough data on rpm and torque expected. |
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#Post#: 5959-------------------------------------------------- |
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Re: Hydrocat turbine |
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By: rrattink Date: May 11, 2015, 7:48 pm |
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Thx. I guess the place to start is by measuring the efficiency |
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of the "paddle wheel" in relation to the water flow and come up |
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with an rpm. Time to build. Any ideas on the most efficient |
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wheel diameter to length would be? Since water is much denser |
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than air the length would give me torque as more "blade surface" |
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is being pushed. Conversely a smaller diameter would spin faster |
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and improve rpm. Does this make sense to you? Got any forum |
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members up to date on hydrodynamics? 😀 |
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#Post#: 5960-------------------------------------------------- |
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Re: Hydrocat turbine |
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By: lynx wind Date: May 12, 2015, 7:02 am |
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Water is analogous to electricity. Smaller pipe higher pressure |
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(volts). Higher volume higher flow (amps) |
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If you can drop the water from a height you will get more power. |
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This is why hydro electric plants draw water from near the top |
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and place the turbines below. |
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If you make a big diameter wheel you will get low rpm high |
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torque. Small diameter = high rpm low torque. Either way the |
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power is the same. Torque x rpm |
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Try making a system where the water has to flow through the |
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turbine and not around. |
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#Post#: 5961-------------------------------------------------- |
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Re: Hydrocat turbine |
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By: rrattink Date: May 12, 2015, 9:39 am |
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Thx. I get what your saying with the dam analogy but this puppy |
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will be portable and floats on the surface of the creek or |
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river. I'll draw something up of wat I'm looking at so you can |
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get an idea. This is the initial source of my idea |
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https://m.youtube.com/watch?v=H3_jPbQ2iuc |
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#Post#: 5962-------------------------------------------------- |
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Re: Hydrocat turbine |
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By: lynx wind Date: May 12, 2015, 11:44 am |
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Considering the Hydro Cat design is so easy it justifies the |
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lower efficiency. Not everyone is going to build an elevated |
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water fall leading to a hydro plant. I have a PMA that I run |
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with a steam engine. It puts out 200 watts and only turns at |
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about 200 rpm. |
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