Analysis method of more-electric aircraft energy efficiency based on exergy

To analyze the energy efficiency of more-electric aircraft, the modular modeling of a system and exergy analysis are combined constructing an analysis method of energy efficiency. Using this new method, the system of a more-electric aircraft is decomposed into pieces, including the propulsion system, electric system, hydraulic system, frame, anti-icing & de-icing system, environmental control units and cabin. In addition, the exergy distribution and efficiency among the various sub-systems are calculated during a completed cruise mission. Energy efficiency of the same sub-system working in different phases and of different sub-systems working in the same flight phase are also analyzed. The combustion state term which influences the formula of fuel exergy is taken into consideration along with the chemical energy. The result shows that exergy destruction of a more-electric aircraft occurs mainly in the engine, followed next by the hydraulic actuation system. The anti-icing & de-icing unit exhibits good efficiency during takeoff and landing, but not so good in the holding phase.