Re: overunity" revised"
Posted by Southern Man on Jun 09, 2002 at 08:36
Re: overunity" revised" (paul baughn)
“fill the pipe with water. so that the water level is at the top of each elbow.
now slowly put 1 gallon of water in one end.“
How slowly? If the inlet and outlet elbows are at exactly the same height it will be impossible to get any water into the pipe. As you try to add water it will just over flow at the inlet elbow rather than try to move all the water in the pipe to get to the outlet elbow.
So, let’s make the inlet elbow a little higher just so we can get the water to flow. Now we can slowly pour water in at the inlet, it sits a little higher than the outlet which causes a flow from inlet to outlet. You pour one gallon in the inlet and one gallon comes out the outlet PLUS some energy to move all the water in the pipe.
“the energy required to lift the 1 gallon will be returned at the opposite end in the form of potential energy.”
Nope. The water came out of an elbow that was lower than the inlet. The energy out was slightly less because it wasn’t at the same height. How much less?
Let’s put a turbine in the pipe to be able to measure and use the energy of the flowing water. Let’s put in a really efficient turbine that really stops up the flow so as to extract every erg of energy. Now the flow is very restricted and to get any appreciable flow rate you have to make the inlet elbow much higher than the outlet or the water just won’t flow fast enough to be measurable.
Hopefully you can see that the difference in elevation from inlet to outlet determines how much energy can be expended in the middle moving water against friction or a turbine. If there is no difference in elevation then no water flows. If there is a difference then there is some potential energy in that height difference that can be extracted.