Well now yemabion welcome to CR4, you asked about areas of applications? naturally there are current 'cost' constraints. Something might be feasible now, but not justified yet. Check out Dr. Ray Kurzweil's website, even download 'Ramona' an 'Avatar' creation of his that you can talk to about all the latest technologies.
A recent thread on CR4 concerned extracting power from air. Is this possible? We were thinking perhaps it might be, if we could train the crazy chaotic molecules of air to behave properly. Maxwell's Demons might help.
You may have heard of, or even seen these 'shake torches' that after about 90 gentle shakes light a powerful LED for 20 minutes or so. A strong Neodymium magnet inside a coil charges up a capacitor. Well we thought that if we had billions of tiny magnets suspended inside billions of tiny coils, employing nano-technology fabrication techniques. then if this was assembled into a sort of air filter, ....when air entered, all those air molecules would be bouncing about at high velocity all over the place. Check out 'Brownian Motion in Gases' ...Perhaps those tiny magnets/whatever might get so shook up they induced a micro-current? At nano scales, dust is knocked about all over the place. The air going through such a 'filter' would lose energy, and so 'cool' as a consequence. So Vemabion, you live in Hot Nigeria. how about Air Conditioning that dehumidified a bucket or so water a day, and also produced a bit of electric power as well? ....Just a dream now, but costs are on an ever downward incline. Remember the first law of thermodynamics was presented thus:-
"Because we know a perpetual motion machine is impossible......etc." Hold on a tick, who says so? we KNOW no such thing, all we KNOW is that many have failed to make a perpetual motion machine.....Good luck with your investigations Vemabion.
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"Neither man nor woman can be worth anything until they have discovered that they are fools. The sooner the discovery is made the better, as there is more time and power for taking advantage of it." William Lamb