Abstract: An energy conversion arrangement for an aircraft, an energy system and an aircraft comprising an energy conversion arrangement and/or an energy system are provided. The energy conversion arrangement includes a fuel conversion device, in particular a fuel cell system, configured to convert at least one fuel to electrical and/or mechanical energy, and at least one an exhaust outlet for letting out exhaust produced in the fuel conversion device by the fuel conversion, and at least one mixing assembly configured to merge a stream of further exhaust of the fuel conversion device with at least one stream of the exhaust from the at least one exhaust outlet.