b"Aerospace | Engineer InnovationFrame A4 WindowSection 1 Section 2A3Floor StanchionTransverseBeama power source, with an initial cabinFrom the mixing unit, the fresh air is temperature after heat soak of 45Cthen distributed to the cabin, here (113F) and no passengers aboard. Thisdivided into three main zones, namely requirement has a direct impact on thethe flight deck, the forward and the aircraft turnaround time, hence theaft cabin.aircraft operating cost, as the cooling down time delays the aircraft's fullIt is clear that in order to speed up the operability. design of the ACMs and hence reduce development time and costs, it is From an engineering perspective, thisnecessary to assess their performance requirement represents one of theintegrating them into the ECS with the main dynamic sizing cases for theappropriate environmental conditions. aircraft ECS. In particular, it drives theSimcenter Amesim software provides sizing of the air cycle machines (ACMs)powerful capabilities which help you or air conditioning packs. Thesemodel and integrate multi-physical refrigeration units are based on the airsystems as well as evaluate their cycle cooling process and represent theperformance for different sizing core of the ECS. scenarios.A typical ECS architecture is shown inOptimizing ECS design with the schematics below. Compressed hotSimcenter Amesim air is bled from the engine compressorsContributing to international research or the APU (not represented here),projects and working closely with our cooled by a pre-cooler heat exchangercustomers, Siemens PLM Software installed downstream the engine bleeddeveloped a methodology that, ports and conveyed to the ACMs. Eachstarting from the aforementioned ACM consists of a compressor, arequirements, allows engineers to turbine and a fan mounted on thederive the required power to be same shaft. Hot air bled from thedelivered by the ACMs to cool down or engine compressors passes throughheat up the cabin, to model the the primary heat exchanger where it isequipment and to integrate it with the cooled before entering the compressor.ECS model. This methodology, Compressed air passes through thesummarized in the following sections, main heat exchanger, a re-heater and ais explained in more detail in the condenser before entering the turbine.standard demonstrators included in At the exit, air humidity is removed bySimcenter Amesim and applied to another passage through theindustrial use cases as described in condenser. At this point, the cooled airpapers [1] and [2].is conveyed to the mixing unit.Assessing power requirementsThis architecture is known as 3-wheelThe first step of the methodology machine, and a common variant is theconsists of discretizing the aircraft 4-wheel machine where a secondstructure by applying a nodal approach turbine is added on the same shaftwith a goal of capturing its thermal downstream the condenser.behavior. This can be achieved using 47"