Abstract: A method for power generation via a liquid-gas phase transition. The method includes receiving atmospheric air as input to create an enthalpy difference gradient. A regenerative piston engine received atmospheric air. The regenerative piston engine collects heat generated from the enthalpy difference gradient. The regenerative piston engine converts the collected heat to a mechanical form of energy at the regenerative piston engine.

Abstract: A method for power generation via a liquid-gas phase transition. The method includes receiving atmospheric air as input to create an enthalpy difference gradient. A regenerative piston engine received atmospheric air. The regenerative piston engine collects heat generated from the enthalpy difference gradient. The regenerative piston engine converts the collected heat to a mechanical form of energy at the regenerative piston engine.

Abstract: A power system includes a device for extracting energy from a hot gas stream to power a driveshaft. An evaporative duplex counterheat exchanger is disposed in flow communication with the energy extracting device. The duplex exchanger includes a first heat exchanger having a first main flow channel, and a counterheat channel joined in flow communication therewith. A second heat exchanger includes a second main flow channel adjacent the counterheat channel. And, an evaporative fluid is injected into the counterheat channel to evaporatively cool the flow through both main flow channels.

Abstract: A duplex exchanger includes first and second heat exchangers each including a main flow channel and a cooperating counterheat channel. The first counterheat channel is joined to the first main flow channel for receiving a cooled primary stream therefrom. The second counterheat channel is also joined to the first main channel splitting the primary stream therefrom. An evaporative coolant is injected into the first counterheat channel, and an evaporative saturant is injected into the second counterheat channel. Heat from the initially hot primary stream in the first exchanger evaporates the coolant in the first counterheat channel for self-cooling the primary stream in the first main channel. Heat from a hot secondary stream channeled through the second main channel evaporates the saturant in the second counterheat channel for adding mass to the primary stream channeled therethrough.

Abstract: A power system includes a device for extracting energy from a hot gas stream to power a driveshaft. An evaporative duplex counterheat exchanger is disposed in flow communication with the energy extracting device. The duplex exchanger includes a first heat exchanger having a first main flow channel, and a counterheat channel joined in flow communication therewith. A second heat exchanger includes a second main flow channel adjacent the counterheat channel. And, a evaporative fluid is injected into the counterheat channel to evaporatively cool the flow through both main flow channels.