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A power system for an aircraft includes a solid oxide fuel cell system which generates electric power for the aircraft and an exhaust stream; and a heat exchanger for transferring heat from the exhaust stream of the solid oxide fuel cell to a heat requiring system or component of the aircraft. The h

A power system for an aircraft includes a solid oxide fuel cell system which generates electric power for the aircraft and an exhaust stream; and a heat exchanger for transferring heat from the exhaust stream of the solid oxide fuel cell to a heat requiring system or component of the aircraft. The heat can be transferred to fuel for the primary engine of the aircraft. Further, the same fuel can be used to power both the primary engine and the SOFC. A heat exchanger is positioned to cool reformate before feeding to the fuel cell. SOFC exhaust is treated and used as inerting gas. Finally, oxidant to the SOFC can be obtained from the aircraft cabin, or exterior, or both.

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1. A power system for an aircraft, comprising: a primary aircraft jet engine and a supply of fuel communicated with the primary aircraft jet engine;a solid oxide fuel cell system which generates electric power for the aircraft and an exhaust stream; anda heat exchanger for transferring heat from the

1. A power system for an aircraft, comprising: a primary aircraft jet engine and a supply of fuel communicated with the primary aircraft jet engine;a solid oxide fuel cell system which generates electric power for the aircraft and an exhaust stream; anda heat exchanger for transferring heat from the exhaust stream of the solid oxide fuel cell system to a heat requiring system or component of the aircraft, wherein the heat requiring system or component of the aircraft comprises the fuel communicated with the primary aircraft jet engine. 2. The system of claim 1, wherein the heat exchanger comprises a first flow path for the solid oxide fuel cell system exhaust stream and a second flow path for the fuel, wherein the second flow path is in heat exchange relationship with the first flow path. 3. The system of claim 1, further comprising an exhaust line connected between the solid oxide fuel cell system and the primary engine to convey the exhaust stream to an air intake of the primary engine. 4. The system of claim 1, wherein the heat exchanger produces a cooled exhaust stream, and further comprising a condenser for receiving the cooled exhaust stream and producing water and a dried exhaust stream. 5. The system of claim 4, further comprising a fuel storage tank storing fuel for the power system, wherein the fuel storage tank is communicated with the condenser whereby the dried exhaust stream is fed to the fuel storage tank as inerting gas. 6. The system of claim 4, further comprising a water line connected between the solid oxide fuel cell system and a water requiring system or component of the aircraft. 7. The system of claim 1, wherein the solid oxide fuel cell system has at least one cathode generating a cathode exhaust stream, and at least one anode generating an anode exhaust stream, wherein the exhaust stream comprises at least one of the anode exhaust stream, the cathode exhaust stream and mixtures thereof. 8. The system of claim 7, further comprising a cathode recycle line communicated between a cathode exhaust and a cathode inlet for recycling oxidant flow to the cathode. 9. The system of claim 1, wherein the solid oxide fuel cell system is adapted to operate at a pressure of greater than or equal to 1 bar. 10. The system of claim 1, wherein the solid oxide fuel cell system is adapted to operate at a pressure of between 1 and 4 bars.