A system for converting potential energy into electric power from a mixture of gases, such as atmospheric air, including a particular lesser-density-gas, such as nitrogen, and a particular larger-density-gas, such as oxygen. The system includes a gas-separator at an upper-elevation; a gas-flow-conduit that has a gas-exit-port at a lesser-elevation, where the lesser-elevation is significantly lower than the upper-elevation; and an energy-converter positioned on the gas-flow-conduit. The gas-separator is coupled to the gas-exit-port via the gas-flow-conduit. The gas-separator separates the particular larger-density-gas from the gas mixture. The gas-flow-conduit conducts the separated particular larger-density-gas from the gas-separator via the gas-flow-conduit to the energy-converter; and the energy-converter generates electric power from the conducted separated particular larger-density-gas.

A system for converting potential energy into electric power from a mixture of gases, such as atmospheric air, including a particular lesser-density-gas, such as nitrogen, and a particular larger-density-gas, such as oxygen. The system includes a gas-separator at an upper-elevation; a gas-flow-conduit that has a gas-exit-port at a lesser-elevation, where the lesser-elevation is significantly lower than the upper-elevation; and an energy-converter positioned on the gas-flow-conduit. The gas-separator is coupled to the gas-exit-port via the gas-flow-conduit. The gas-separator separates the particular larger-density-gas from the gas mixture. The gas-flow-conduit conducts the separated particular larger-density-gas from the gas-separator via the gas-flow-conduit to the energy-converter; and the energy-converter generates electric power from the conducted separated particular larger-density-gas.

Systems and methods are described for generating electricity from fluid produced from a subsurface formation. The disclosed systems and methods include generating electrical power using the energy content of fluids produced from the earth or hot fluids created during surface processing of the produced fluids. Specific systems and methods describe utilizing heat and pressure of oil, gas, or water to generate electrical power.

An air-driven generator system for generating electric power from movement of a working liquid. The system includes an air-driven generator that includes a liquid turbine system fluidically interposed between the lower end of an elongate gravitational distribution conduit and the lower ends of plural elongate buoyancy conduits. A heavy working liquid flows from the upper ends of the buoyancy conduits and is fed into the upper end of the elongate gravitational distribution conduit. Working liquid flows down the elongate gravitational distribution conduit to actuate the liquid turbine system. An injection of air into the working liquid in the plural elongate buoyancy conduits induces upward flow of the working liquid. The system includes a solar thermal heating system fluidically coupled to heat exchangers that transfer heat collected by the solar thermal heating system to the working fluid through a thermal transfer fluid circuit.

A sublimation generator including a sublimation tank configured to receive ice including at least carbon dioxide. The sublimation generator also includes a first heat exchanger in thermal communication with the sublimation tank. The first heat exchanger being configured to expel heat from a coolant into the sublimation tank to sublimate the carbon dioxide into a gaseous state. The sublimation generator also includes a gas turbine generator fluidly connected to the sublimation tank and configured to receive the carbon dioxide in the gaseous state.

A sublimation generator including a sublimation tank configured to receive ice including at least carbon dioxide. The sublimation generator also includes a first heat exchanger in thermal communication with the sublimation tank. The first heat exchanger being configured to expel heat from a coolant into the sublimation tank to sublimate the carbon dioxide into a gaseous state. The sublimation generator also includes a gas turbine generator fluidly connected to the sublimation tank and configured to receive the carbon dioxide in the gaseous state.

A sublimation generator including a sublimation tank configured to receive ice including at least carbon dioxide. The sublimation generator also includes a first heat exchanger in thermal communication with the sublimation tank. The first heat exchanger being configured to expel heat from a coolant into the sublimation tank to sublimate the carbon dioxide into a gaseous state. The sublimation generator also includes a gas turbine generator fluidly connected to the sublimation tank and configured to receive the carbon dioxide in the gaseous state.

Gearboxes for aircraft gas turbine engines, in particular arrangements for journal bearings such gearboxes, and related methods of operating such gearboxes and gas turbine engines. A gearbox for an aircraft gas turbine engine includes: a sun gear; a plurality of planet gears surrounding and engaged with the sun gear; and a ring gear surrounding and engaged with the plurality of planet gears, each of the plurality of planet gears being rotatably mounted around a pin of a planet gear carrier with a journal bearing having an internal sliding surface on the planet gear and an external sliding surface on the pin.

Gearboxes for aircraft gas turbine engines, in particular arrangements for journal bearings such gearboxes, and related methods of operating such gearboxes and gas turbine engines. A gearbox for an aircraft gas turbine engine includes: a sun gear; a plurality of planet gears surrounding and engaged with the sun gear; and a ring gear surrounding and engaged with the plurality of planet gears, each of the plurality of planet gears being rotatably mounted around a pin of a planet gear carrier with a journal bearing having an internal sliding surface on the planet gear and an external sliding surface on the pin.

The present disclosure provides systems and methods for power production. In particular, the systems and methods utilize the addition of heat to an expanded turbine exhaust stream in order to increase the available quantity of heat for recuperation and use therein for heating a compressed carbon dioxide stream for recycle back to a combustor of the power production system and method.