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4 Method In this chapter, a method of comparative analysis will be formulated so that the questions stated in the goals of this study can be answered. Three variables, listed below, are especially of interest when simulating the performance of an electric passenger jet airplane. 1. Cell-mass-fraction 2. Gravimetric energy density of batteries 3. Reduction in propulsion energy compared to Boeing 787-8 The first one determines how much of the total weight that is reserved for energy storage in the form of batteries. The second one is the energy density of the batteries. The third one is a measure of the total efficiency of the aircraft. To simulate the range performance of the electric passenger jet airplane in different scenarios, Piano-X will be used. This software is described further in Chapter 5. The fuel required for a certain flight was calculated by Piano-X, and then recalculated into electrical energy by using the efficiencies of the turbofan engine and the electrical efficiency of the motor. The electrical energy required for a certain flight could then be translated into a requirement on the combination of gravimetric energy density, cell-mass-fraction and reduction in propulsion energy for a given range. 13PDF Image | Electric Propulsion Passenger Jet Airplanes Requirements to realize all-electric propulsion
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