TY - GEN A1 - König, Paul A1 - Höschler, Klaus A1 - Haridasu, Venkata Brahma Teja T1 - Surface Heat Exchanger Assessment for Battery Powered Aircrafts T2 - AIAA AVIATION Forum, San Diego, 2023 N2 - The thermal management system represents a major challenge for a sustainable transformation of aviation industry from conventional to (hybrid)-electric propulsion. Although component efficiencies of motors, generators, power electronics and batteries are much higher compared to conventional gas turbines, heat dissipation is a challenge if flight characteristics are not to be compromised by massive drag growth. One solution is provided by structural surface heat exchangers, which use the aircraft's wetted surface to reject heat to the environment. Using the temperature-sensitive battery, the potential for fuselage-integrated surface heat exchangers will be evaluated. For this purpose, different flight conditions: take-off, climb, cruise and descent; operational concepts: battery-assisted take-off, battery-assisted climb and recuperative descent, and normal and hot day flight cycles will be investigated using a battery-hybridized reference flight of a Saab 340. A method for calculating reversible and irreversible heat fluxes in the battery is presented and used as a quantitative measure. The theoretical suitability of surface heat exchangers for battery heat rejection can be demonstrated for various flight conditions. Critical design points are not only the take-off but also the battery-assisted climb as well as a too power demanding recuperation during descent. The findings obtained are suitable for use in optimizing operating concepts, identifying suitable charging currents, and for transferability to different aircraft sizes as a function of their take-off weight. KW - Electrical Energy Generation KW - Electrical Storage KW - Electrical Management Y1 - 2023 UR - https://arc.aiaa.org/doi/10.2514/6.2023-4534 U6 - https://doi.org/10.2514/6.2023-4534 SP - 1 EP - 13 PB - American Institute of Aeronautics and Astronautics ER -