The ship model shows the energy flows on board a ship. Green stands for sustainably produced fuels, which are channelled into the fuel cell via a reformer. The electricity provided by the fuel cell is labelled yellow and is fed into the rest of the ship via the energy management system. The energy management system supplies the engine in particular, which is the main consumer. This model shows a modern RoPax ferry that also has passengers on board. Passenger cabins are air-conditioned. Cooling is visualised by the blue currents. It is also possible to heat the cabin.