Abstract: This is a machine that contains a fluid loop that is utilized by using buoyancy and gravity to produce a fluid flow through a hydro turbine or other flow energy converter within the enclosed system. In one embodiment compressed gas is injected into a vessel at the underside of a piston to create a buoyant condition which forces the piston upward, thusly forcing the fluid above the piston through the hydro turbine. In another embodiment fluid or other matter fills a hollow piston at the top of the vessel and through the force of gravity descends, thusly forcing the fluid beneath the hollow piston downward and in turn upward through the adjoined vessel and then through the hydro turbine. In both referenced embodiments alternating ascent and descent cycles can be utilized within each adjoined vessel to cause fluid flow through the hydro turbine. Other embodiments are presented within as examples.

Abstract: This is a machine that contains a fluid loop that is utilized by using buoyancy and gravity to produce a fluid flow through a hydro turbine or other flow energy converter within the enclosed system. In one embodiment compressed gas is injected into a vessel at the underside of a piston to create a buoyant condition which forces the piston upward, thusly forcing the fluid above the piston through the hydro turbine. In another embodiment fluid or other matter fills a hollow piston at the top of the vessel and through the force of gravity descends, thusly forcing the fluid beneath the hollow piston downward and in turn upward through the adjoined vessel and then through the hydro turbine. In both referenced embodiments alternating ascent and descent cycles can be utilized within each adjoined vessel to cause fluid flow through the hydro turbine. Other embodiments are presented within as examples.