Patent ID: 7731480

Claim:
A power turbine, comprising: a housing; a plurality of disks on a shaft and separated by spacers that form respective spaces between adjacent disks; the disks, spacers, and spaces being inside the housing; a gas injector injecting a gas into some of the spaces near the circumference of the disks so that those spaces are drive spaces, the gas acting to drive the adjacent disks; a hot fluid line transporting fluid from other spaces to outside the housing, the hot fluid line positioned near the circumference of the disks so that those other spaces are pump spaces; a fluid port between respective drive spaces and pump spaces, the fluid port positioned to allow fluid to flow from each respective drive space into a next pump space; and wherein gas injected into drive spaces condenses into fluid in the drive space, so that the condensed fluid passes through the fluid port into a pump space, and by centrifugal force is moved to the hot fluid line and transported out the housing.