b'Engineer Innovation | AerospaceHow toAssess aircraft cabin cooling sizing with Simcenter AmesimBy Federico Cappuzzo, Simcenter Amesim product manager Addressing environmental controlaircraft manufacturers equip the ECS to systems design challenges provide an optimal temperature for According to the certificationpassenger comfort during the flight.specifications for large civil airplanes (such as FAR-25 or JAR/CS-25), aircraftAnother requirement expressed by environmental control systems (ECS)airlines concerns the so-called pull-must ensure adequate cabin conditionsdown or cabin cooling case. Here, for passenger safety. For instance, crewaircraft manufacturers are requested to and passengers must receive enoughdemonstrate that the aircraft on the fresh air, free of hazardousground on a hot day is able to reach a concentration of gases, andtemperature lower than 27 degrees pressurized cabin compartments mustCelsius (80 degrees Fahrenheit) in less provide a pressure altitude of no morethan 30 minutes. This shall be achieved than 8000 feet (ft). On top of that,using the auxiliary power unit (APU) as 46'