A bipolar plate for a fuel cell having a two-phase cooling system and a fuel cell system includes a coolant inlet, a coolant outlet, and coolant channels with the coolant inlet being in fluid connection with the coolant outlet via the coolant channels. At least one inner surface of coolant inlet, coolant outlet and at least one of the coolant channels has a surface treatment to influence a flow regime of a cooling fluid along at least one inner surface and/or a phase transition of the cooling fluid.

A bipolar plate for a fuel cell having a two-phase cooling system and a fuel cell system includes a coolant inlet, a coolant outlet, and coolant channels with the coolant inlet being in fluid connection with the coolant outlet via the coolant channels. At least one inner surface of coolant inlet, coolant outlet and at least one of the coolant channels has a surface treatment to influence a flow regime of a cooling fluid along at least one inner surface and/or a phase transition of the cooling fluid.

A fuel cell system having a two-phase cooling system includes at least one fuel cell having a coolant inlet and a coolant outlet, an accumulator in fluid connection with the fuel cell to contain coolant which flows out of the fuel cell in a liquid phase in a first portion and in a gas phase in a second portion, a condenser in fluid connection with the accumulator to condense and supercool the coolant, a thermally conductive element between the coolant inlet and the coolant outlet to transfer heat from the coolant outlet to the coolant inlet.

A fuel cell system having a two-phase cooling system includes at least one fuel cell having a coolant inlet and a coolant outlet, an accumulator in fluid connection with the fuel cell to contain coolant which flows out of the fuel cell in a liquid phase in a first portion and in a gas phase in a second portion, a condenser in fluid connection with the accumulator to condense and supercool the coolant, a thermally conductive element between the coolant inlet and the coolant outlet to transfer heat from the coolant outlet to the coolant inlet.

A fuel cell system comprising a fuel cell, a fuel tank, a fuel distribution pipe fluidly connecting the fuel tank with a fuel inlet of the fuel cell. The fuel distribution pipe has an inner pipe and an outer pipe, the latter of which receives a stream of inert gas from an inert gas separator that is fluidly connected to a gas outlet of the fuel cell.

A fuel cell system comprising a fuel cell, a fuel tank, a fuel distribution pipe fluidly connecting the fuel tank with a fuel inlet of the fuel cell. The fuel distribution pipe has an inner pipe and an outer pipe, the latter of which receives a stream of inert gas from an inert gas separator that is fluidly connected to a gas outlet of the fuel cell.

An electrically-powered turbine assembly includes a fixed housing; an air compressor including a compressor stator fixed to the housing; a turbine including a turbine stator fixed to the housing; a central shaft supported by the compressor stator and affixed to the turbine stator; an electric motor including an electric motor stator fixed to the central shaft, said electric motor having a rotating shell; an air compressor rotor affixed to the rotating electric motor shell; and a turbine rotor affixed to the rotating electric motor shell. The electrically-powered turbine assembly preferably includes one or more fuel cells as an electric power source. The electrically-powered turbine assembly may be used to power an aircraft.

An electrically-powered turbine assembly includes a fixed housing; an air compressor including a compressor stator fixed to the housing; a turbine including a turbine stator fixed to the housing; a central shaft supported by the compressor stator and affixed to the turbine stator; an electric motor including an electric motor stator fixed to the central shaft, said electric motor having a rotating shell; an air compressor rotor affixed to the rotating electric motor shell; and a turbine rotor affixed to the rotating electric motor shell. The electrically-powered turbine assembly preferably includes one or more fuel cells as an electric power source. The electrically-powered turbine assembly may be used to power an aircraft.

A sustainable water fueled process and apparatus where a Unipolar electrolysis of water is described and the hydrogen and oxygen are stored before feeding a hydrogen fuel cell which is capable of providing sufficient electricity to provide power to a drive a vehicle, power a generator etc, after supplying electricity to the Unipolar electrolyser and the storage of the hydrogen and oxygen.

An aircraft having unobstructed cabin door access includes a hybrid power drive with a combustion engine connected to an electricity generating machine. Components of the hybrid power drive are positioned throughout the aircraft to provide a weight distribution having an aft bias. The aircraft further includes a forward swept wing and a cabin door positioned forward of the forward swept wing, such that access into a fuselage of the aircraft via the cabin door is unobstructed by the forward swept wing.