I saw a video of these guys building tesla boundary layered turbines. They were using (water heated in a tube that was inside another vaccuum sealed tube) that tube system was mounted in the center of a solar reflector to boil it. The turbine was screaming. It was wild and super loud too. Now I dont understand how to run a system like that in a closed system, but I was thinking if you had it near an ocean or lake, where water is abundant; just let it spin and steam off( hell you could collect distilled water near the ocean) Anyway I've heard of systems where they heat oil or salt into underground barrels, so when the sun goes down they [(water boils at 212°), (oil boils at 572°), (salt boils at 2575°)] pump the fluid up to boil water at night. Why arent we using systems like this for energy and fresh water in remote areas? I heard tesla said his boundary layer turbine was his favorite invention. And where his failed we have abundant access to higher quality metals for the thin discs.