Hydro-electric power from wiers

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Hydro-electric power from wiers

Postby wimpole » Thu Apr 24, 2008 5:12 pm

I am used to guaging flow in gallons per hour over wiers. If each gallon of water weighs 8 pounds how can I calculate megawatts of electricity from the energy produced by X pounds of water falling Y feet over a wier - say?
Suggestions please
wimpole
 
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Re: Hydro-electric power from wiers

Postby Guest » Thu Apr 24, 2008 6:42 pm

wimpole wrote:I am used to guaging flow in gallons per hour over wiers. If each gallon of water weighs 8 pounds how can I calculate megawatts of electricity from the energy produced by X pounds of water falling Y feet over a wier - say?
Suggestions please


Well, I refuse to work in incoherent units, so lets talk metric.

The potential energy of the water is E = m*g*h.
If you introduce flow rate, the power of the falling water is (m/t)*g*h

Using flow in kg/s, g = 9.8 m/s², and height in meters, you get watts. Of course the generator won't be 100% efficient. High head generators at major dams may reach 85%. Low head hydro won't do that well; I'm guessing 70% or lower, but you might wish to research.
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