A propulsion system for an aircraft includes a gas generating core engine that generates an exhaust gas flow that is expanded through a turbine section. A power turbine engine is forward of the core engine and is coupled to drive a propulsor. A hydrogen fuel system supplies hydrogen fuel to the combustor through a fuel flow path. A condenser extracts water from the exhaust gas flow. A water separator is in communication with the condenser and directs the extracted water to a water storage tank. An evaporator receives a portion of the water that is extracted by the condenser and generates a steam flow. The steam flow is injected into the core flow path upstream of the turbine section.

A compact two-stage evaporator waste heat recovery (WHR) device (7) is disclosed, and a system using the device. The device recovers energy from waste heat passing through the device and transfers that energy to a Rankine Cycle working fluid also passing through the device. The device includes a first and second evaporator (15); and, a state separator (17) connected between the outlet of the first evaporator and the inlet of the second evaporator. The state separator (17) separates the working fluid into liquid and vapor. The liquid is re-cycled to the inlet of the first evaporator (15); the vapor is sent to the inlet of the second evaporator (19) for superheating. An overall WHR system using the device further includes an expander (21), condenser (23), and pump (25). The system further includes control circuitry (26) for controlling operation of the waste heat recovery device (7) itself and the WHR system.

The present invention relates to an arrangement comprising a waste heat recovery system (WHR-system) and a method for controlling the arrangement. The arrangement comprises an expansion tank having a constant inner volume, first cooling means configured to cool the working fluid in the condenser and a control unit configured to control the first cooling means such that the working fluid is cooled to a desired condensation temperature in the condenser during operation of the WHR system. The arrangement comprises further a sub-cooler arranged in a position downstream of the condenser and second cooling means configured to cool the working fluid in the sub-cooler, and that the control unit is configured to control the second cooling means such that the working fluid receives a determined subcooling in the sub-cooler during operation of the WHR system.

An arrangement and a method for controlling a shutdown phase of a WHR-system. The WHR system includes a main circuit (4) which includes a pump (3), an evaporator (5), an expander (7) and a condenser (10), and a compensation tank (12) which is configured to compensate for volume changes of a working fluid in the main circuit (4) during operation of the WHR system. The arrangement includes a control unit (26) configured to receive information when the shutdown phase of the WHR system is to be initiated and a flow device able to supply working fluid from the compensation tank (12) to the main circuit (4). The control unit (26) is configured to activate the flow device such that working fluid is supplied from the compensation tank (12) to the main circuit (4) when it receives information indication that the shutdown phase of the WHR system is to be initiated.

A cooling system for a combustion engine and a WHR-system in a vehicle (1) includes a first line (23) directing coolant at a first temperature (T.sub.1) to a condenser (18) of the WHR system, a second line (24) directing coolant at a second temperature (T.sub.2) to the condenser (18), a valve arrangement (25, 26, 29) by which the flow rate of the coolant in at least one of the lines (23, 24) is adjustable and a control unit (20) configured to control the valve arrangement (25, 26, 29) such that the coolant directed to the condenser (18) from the lines (23, 24) has a temperature and a flow rate which results in a cooling of the working medium in the condenser (18) to a predetermined condensation temperature/pressure at the actual operating condition.

A cooling system for a combustion engine and a WHR-system in a vehicle (1) includes a first line (23) directing coolant at a first temperature (T.sub.1) to a condenser (18) of the WHR system, a second line (24) directing coolant at a second temperature (T.sub.2) to the condenser (18), a valve arrangement (25, 26, 29) by which the flow rate of the coolant in at least one of the lines (23, 24) is adjustable and a control unit (20) configured to control the valve arrangement (25, 26, 29) such that the coolant directed to the condenser (18) from the lines (23, 24) has a temperature and a flow rate which results in a cooling of the working medium in the condenser (18) to a predetermined condensation temperature/pressure at the actual operating condition.

An automobile drive system that basically uses an electrical motor to power the vehicle includes a steam generator that drives a steam turbine that turns a generator to provide electricity to continually charge the battery that provides energy to the electrical drive motor. With this system the battery is continually being charged and does not have to periodically be plugged into a power source to charge the battery. Also, an additional generator/alternator can be driven by the electrical drive motor or steam turbine to provide additional electrical power as needed.

A method for recovering heat from a flue gas from an engine and a heat recovery system are described. The method involves contacting coolant in a vaporization chamber with a plurality of flow-modifying structures. The structures are arranged in series in the direction of the flow of coolant liquid and are each configured for modifying the flow of the coolant liquid and the vapour in said vaporization chamber.

A rotational power system (RPS) that utilizes environmental air to produce continuous rotation of a circular object such as a tire or wheel. The RPS has an air intake assembly having at least one air intake member. The intake member has an outer side edge with at least one opening into which an air intake valve is inserted, with a valve plunger extending outward from the valve. The intake member also has two side surfaces with a second side surface having an opening, and an internal cavity within which an air intake interface is located. Proximate to the air intake member is an air intake extension member having an opening, a cover with an air outlet bore, a side member with perimeter teeth, a connecting rod, and a circular structure onto which the intake assembly and the at least one intake member are attached. Connected via an air hose to the intake member is an air tank, and an air heater is connected to and receives air from the air tank. A turbine has an outer edge with concave members, an inner frame, a center opening and an axle extending through the center opening and attached to a first wheel located adjacent to the turbine. As a tire and wheel rolls on the ground surface, the tire and wheel interfaces with the extending valve plungers forcing each plunger down and causing air to enter via the air intake member and then directed through the air tank and air heater, the heated air is directed to the turbine thereby causing the turbine to rotate about the axle and the heated air to be directed back to the tire and wheel causing the tire and wheel to rotate.

A rotational power system (RPS) that utilizes environmental air to produce continuous rotation of a circular object such as a tire or wheel. The RPS has an air intake assembly having at least one air intake member. The intake member has an outer side edge with at least one opening into which an air intake valve is inserted, with a valve plunger extending outward from the valve. The intake member also has two side surfaces with a second side surface having an opening, and an internal cavity within which an air intake interface is located. Proximate to the air intake member is an air intake extension member having an opening, a cover with an air outlet bore, a side member with perimeter teeth, a connecting rod, and a circular structure onto which the intake assembly and the at least one intake member are attached. Connected via an air hose to the intake member is an air tank, and an air heater is connected to and receives air from the air tank. A turbine has an outer edge with concave members, an inner frame, a center opening and an axle extending through the center opening and attached to a first wheel located adjacent to the turbine. As a tire and wheel rolls on the ground surface, the tire and wheel interfaces with the extending valve plungers forcing each plunger down and causing air to enter via the air intake member and then directed through the air tank and air heater, the heated air is directed to the turbine thereby causing the turbine to rotate about the axle and the heated air to be directed back to the tire and wheel causing the tire and wheel to rotate.