Re: re- maths on falling water.
Marinus Berghuis ( firstname.lastname@example.org )
Fri, 15 Jan 1999 20:30:41 +1300
At 20:35 14/01/99 -0700, you wrote:
>At: 4000 Feet, 2 Gallons per minute (probably more)
> Power = 4000 X 2 = 8 kW
>Power generation efficiency of 10% gives us 800 Watts from a 150 Watt motor.
To drop water 4000 feet, you would have to start with an awful wide pipe,
I forgotten what the drag factors are but quite enormous over long length's
I should have the formula's somewhere, (I used to sell pumps )! but
probably no longer in my possession.
I'll see if I can get my hands on the friction tables for various pipes.
Steel ones are less efficient that p.v.c and alkathene is somewhere in