Abstract: The small temperature differential between a warmer zone and a colder zone is exploited to produce work by confining a liquid having a temperature between the temperatures of the warmer and colder zones within a substantially closed air-free chamber in the warmer zone so as to vaporize part of the liquid and drive the remainder by its own vapor pressure to perform work by conversions of the potential or kinetic energy of the liquid. The liquid can pass over and drive a turbine for example. The liquid then flows into another chamber closed to the atmosphere. Once the liquid has been transferred from the first to the second chamber, the chambers may be functionally interchanged or the liquid again transferred to the first chamber.

Abstract: The small temperature differential between a warmer zone and a colder zone is exploited to produce work. A brightly volatile fluid is confined within a substantially closed air-free, air emptied chamber in the warmer zone so as to drive the fluid by its own vapor pressure up a tube into an air-free upper end of an air emptied vertical duct in the colder zone to its lower end at the warm zone. As the fluid descends in the duct it passes over and drives a turbine so as to create mechanical work and then flows into another ductward opened chamber. Once all of the fluid has flown out of the one chamber and into the other a pair of conduits between the lower and upper regions of the other chamber and the lower and lower ends of the duct are closed and the corresponding conduits of the first chamber are opened so that the same process can occur in this other chamber.