A system comprising: an open-loop path configured to extract bleed air from a compressor section of a gas turbine engine through a bleed air port and discharge bleed air to an ambient environment; a closed-loop path configured to circulate a working fluid, wherein the closed-loop path comprises, in sequential series along a direction of flow of the working fluid: a first heat exchanger fluidly coupled to the bleed air port and configured to extract heat from the bleed air to convert the working fluid from a liquid phase at an inlet of the first heat exchanger to a gaseous phase at an outlet of the first heat exchanger; a first turbine fluidly coupled to the outlet of the first heat exchanger that is rotationally driven by expanding the working fluid across the first turbine from a first turbine inlet to a first turbine outlet; a first condenser (28,128) fluidly coupled to the first turbine outlet that is configured to convert the working fluid from the gaseous phase to the liquid phase; and a pump configured to impart work to the working fluid and to deliver the working fluid to the inlet of the first heat exchanger; and a component rotationally coupled to and driven by the first turbine; wherein the first condenser fluidly communicates with the open-loop path such that bleed air flowing through the first condenser extracts heat from the working fluid to convert the working fluid from the gaseous phase to the liquid phase; and characterized in that: the open-loop path further comprises: a system heat exchanger positioned along the open-loop path to receive bleed air from the first heat exchanger and to discharge bleed air to the first condenser, wherein the system heat exchanger places the bleed air in a heat exchange relationship with a medium within an auxiliary system. an open-loop path configured to extract bleed air from a compressor section of a gas turbine engine through a bleed air port and discharge bleed air to an ambient environment; a closed-loop path configured to circulate a working fluid, wherein the closed-loop path comprises, in sequential series along a direction of flow of the working fluid: a first heat exchanger fluidly coupled to the bleed air port and configured to extract heat from the bleed air to convert the working fluid from a liquid phase at an inlet of the first heat exchanger to a gaseous phase at an outlet of the first heat exchanger; a first turbine fluidly coupled to the outlet of the first heat exchanger that is rotationally driven by expanding the working fluid across the first turbine from a first turbine inlet to a first turbine outlet; a first condenser (28,128) a first heat exchanger fluidly coupled to the bleed air port and configured to extract heat from the bleed air to convert the working fluid from a liquid phase at an inlet of the first heat exchanger to a gaseous phase at an outlet of the first heat exchanger; a first turbine fluidly coupled to the outlet of the first heat exchanger that is rotationally driven by expanding the working fluid across the first turbine from a first turbine inlet to a first turbine outlet; a first condenser (28,128) fluidly coupled to the first turbine outlet that is configured to convert the working fluid from the gaseous phase to the liquid phase; and a pump configured to impart work to the working fluid and to deliver the working fluid to the inlet of the first heat exchanger; and a component rotationally coupled to and driven by the first turbine; wherein the first condenser fluidly communicates with the open-loop path such that bleed air flowing through the first condenser extracts heat from the working fluid to convert the working fluid from the gaseous phase to the liquid phase; and characterized in that: the open-loop path further comprises: a system heat exchanger positioned along the open-loop path to receive bleed air from the first heat exchanger and to discharge bleed air to the first condenser, wherein the system heat exchanger places the bleed air in a heat exchange relationship with a medium within an auxiliary system. convert the working fluid from the gaseous phase to the liquid phase; and a pump configured to impart work to the working fluid and to deliver the working fluid to the inlet of the first heat exchanger; and a component rotationally coupled to and driven by the first turbine; wherein the first condenser fluidly communicates with the open-loop path such that bleed air flowing through the first condenser extracts heat from the working fluid to convert the working fluid from the gaseous phase to the liquid phase; and characterized in that: the open-loop path further comprises: a system heat exchanger positioned along the open-loop path to receive bleed air from the first heat exchanger and to discharge bleed air to the first condenser, wherein the system heat exchanger places the bleed air in a heat exchange relationship with a medium within an auxiliary system.