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1 Introduction The introduction describes the background, broad goals and the overall approach taken in this work. 1.1 Background Transportation systems on our planet have been dependent on fossil fuels for over a hundred years. This energy resource has been so plentiful, cheap and energy-dense that for a long time the benefits of this fuel have outweighed the drawbacks (Environmental and Energy Study institute, 2016). Over the last decade however, the negative impacts of fossil fuels have become more apparent because of increased cost of extraction, pollution and the threat of global warming (Environmental and Energy Study institute, 2016). This has spurred the development of new and improved technologies within energy storage, energy transformation and alternative propulsion technologies. Electric propulsion has for many years been held back by the available energy storage technology. Batteries have had too low energy density, power density, and too high cost. The improvement and cost reduction in battery technology over the last few decades has made it possible for road transport vehicles to start a transition to electric propulsion systems. An airplane however has higher requirements than cars in terms of energy density and power density. Electrifying air transport is therefore a much bigger challenge. Electric motors and especially power electronics have also improved over the last few decades, both in terms of power density and efficiencies. Because airplanes are highly sensitive to increases in weight, these drivetrain components could in spite of this still be a limiting factor for the performance of a hypothetical electric passenger jet airplane. 1.2 Broad Goals The goal of this master thesis was to evaluate the feasibility for passenger jet airplanes to use battery-electric jet propulsion with current technology, as well as in the foreseeable future. The following questions were answered: Is current technology in electric propulsion good enough to build an electric passenger jet airplane? If not, what components specifically, need improvements to make it feasible? What range can be achieved with current technology? What range can be achieved in the foreseeable future with expected technology improvements? 1PDF Image | Electric Propulsion Passenger Jet Airplanes Requirements to realize all-electric propulsion
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