Does not exist, but here we convert 2x10-17cc of regular water into energy, and as Albert Einstein taught us in E=mc2, this is enough to drive a 100 MW power station for a year.
When you cry, you lose 0.35cc of water – read about tears in http://www.ncbi.nlm.nih.gov/pubmed/6512146
A regular cooling tower loses 3 gallons per minute http://www.conservationmechsys.com/wp-content/siteimages/Water%20use%20in%20Cooling%20Towers.pdf
Our use of water is so minimal, natural loses are some 1000 million times more. But water is such a dense for energy it looks like free heat. We use 20 atomic units speed of light2. So it is not perpetual motion – but it may as well be.
Every 3 minutes around the world, there is a lightening strike, that produces 5 tonnes of helium ions, and associated ozone, as it does Molecular Nuclear Fusion.
1 H2O+O2+TU->He2++O32++4e-+E1 E1=2.5x1030 W from a 1.5kn partial; steam plasma.
This is massive heat, which teaches us a 1mx1cm steam plasma should produce 4.8 MW. As it does the more exothermic H fission
3 H++e- ->n0
4 16O2++7 n0 ->8H++5e-
So our 50x1cm steam plasma tube does at least 2.8 MW. This is a lot of power. So we site 3 tubes in a bath of water 5 cm deep. And get 9.6 MW. This we use to drive a steam cycle.
And generate about 1 MW of power. We use 20kW to drive a Carnot heat pump. Google 'carbon heat pump cooling tower' http://www.aquacooling.co.uk/spx-marley-cooling-towers/?gclid=COCOzJ7ys84CFcFuGwodBc4BoA
So this condenses the steam to liquid water (At 99oC) But loops back 85% of the heat to the boiler room.
Now we are generating over 110 MW. Of regular water. A volume of water too tiny to measure. The coffee machine with use 200 gallons of water a year. We will effectively use 0. We have no wasteful cooling tower.
We just get effectively free, carbon 0 power – from no Fossil Fuels burn – or hyper toxic nuclear fission.
When we condense the steam, we will get a minute amount of He and O. Too small a volume, for it to be economic to collect. So we vent it. The deep seas produces 100 of gallons a second of these gases, as the sea tides do Molecular Nuclear Fusion.
The O forms O2, which we breath. And the He is lost naturally to space within 24 hours – having reacted with nothing.
So perpetual motion is not possible. The Molecular Nuclear Fusion cycle seems like perpetual motion – as the volume of regular water we use per millennia, is just too small to measure.