----- Original Message -----
From: D�borah SITBON<mailto:[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]>
Sent: Thursday, July 22, 2004 2:18 PM
Subject: [microhydro] relation between water speed and rpm
Hi,
I am designing a water current turbine (no head) expecting to
produce 150 watts on average. I am trying to choose a generator, but
for that i need to know the rpm range.
I don't how to calculate it.
The formula I found for common hydro doesn't suit with zero head.
And the method I found for wind power can't be useful because using
wind power efficiency graph. And this graph should be completly
different for water power. Isn't it?
I hope you can help me.
Dear Deborah,
I have developed a no-head design that I call a Gravity wheel. It is based on the
ancient Persian waterwheel.
It raises water to create head. With this raised water it is then run into a
pipe to create pressure to run a off the shelf turbine with generator.
I foresee this design being made of iron pipe (or maybe heavy walled Plastic
pipe). This would be fairly cheap and allow the whole thing to thread together like an
erector set. It would float, to keep the blades in the water the same amount all the
time.
For more info, Please see my web site at
http://WildWaterPower.com<http://wildwaterpower.com/>
-Dennis
[Non-text portions of this message have been removed]
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