How to… Assess aircraft cabin cooling sizing with Simcenter Amesim

Addressing environmental control systems design challenges

Specifications for large civil ai rplanes (such as FAR-25 or JAR/CS-25), aircraft environmental control systems (ECS) must ensure adequate cabin conditions for passenger safety.

For instance, crew and passengers must receive enough fresh air, free of hazardous concentration of gases, and pressurized cabin compartments must provide a pressure altitude of no more than 8000 feet (ft).

On top of that, aircraft manufacturers equip the ECS to provide an optimal temperature for passenger comfort during the flight.

Another requirement expressed by airlines concerns the so-called “pull- down” or cabin cooling case. Here, aircraft manufacturers are requested to demonstrate that the aircraft on the ground on a hot day is able to reach a temperature lower than 27 degrees Celsius (80 degrees Fahrenheit) in less than 30 minutes.

This shall be achieved using the auxiliary power unit (APU) as 46 Engineer Innovation | Aerospace a power source, with an initial cabin temperature after heat soak of 45°C (113°F) and no passengers aboard.

This requirement has a direct impact on the aircraft turnaround time, hence the aircraft operating cost, as the cooling down time delays the aircraft’s full operability.

Optimizing ECS design with Simcenter Amesim

Contributing to international research.

projects and working closely with our customers, Siemens PLM Software developed a methodology that, starting from the aforementioned requirements, allows engineers to derive the required power to be delivered by the ACMs to cool down or heat up the cabin, to model the equipment and to integrate it with the ECS model.

This methodology, summarized in the following sections, is explained in more detail in the standard demonstrators included in Simcenter Amesim and applied to industrial use cases as described in papers [1] and [2]

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