Modified rankine cycle engine apparatus

A modified Rankine cycle engine apparatus comprising

• a heat reservoir,
• a working fluid having a gaseous phase
• a fluid heating vessel, which heating vessel is in thermal contact with the heat reservoir, the heating vessel having an inlet and an outlet, and which heating vessel contains a portion of the gaseous phase of the working fluid, which experiences heating while within the heating vessel,
• a first conduit having a first end connected to the outlet and having a second end
• an engine in which heated working fluid undergoes an approximately adiabatic expansion, thereby converting a portion of heat energy of the working fluid into mechanical work,
• an engine intake conduit having a first end connected to the first conduit and having a second end connected to the engine, thereby connecting the engine to the outlet of the fluid heating vessel, through which conduits the heated working fluid passes to the engine,
• a jet pump with a suction port, a main flow intake port and a main flow exhaust port,
• an engine exhaust conduit connecting the engine to the suction port of the jet pump, through which conduit expanded, spent working fluid passes from the engine,
• a pump intake conduit having a first end connected to the first conduit and having a second end connected to the pump main flow intake port, thereby connecting the outlet of the heating vessel to the main flow intake port of the jet pump, through which heated working fluid passes into the jet pump and into and through a nozzle structure within the pump, and
• a pump exhaust conduit connecting the main flow exhaust port of the jet pump with the inlet of the heating vessel, through which fluid from the suction port and the main flow intake port passes out of the jet pump and returns to the heating vessel;
• whereby, an adiabatic expansion engine, supplied with a heated, pressurized working fluid is exhausted by a jet pump, and spent working fluid is returned to a heating vessel for reheating.