Thermodynamic Modelling of Air Management System for Commercial Aircraft Environmental Control Systems

For a short-medium-range aircraft at cruise, the Environmental Control System (ECS) consumes about 75% of the total extracted engine bleed air on average. The Air Management System (AMS) of the ECS significantly reduces the bleed air pressure and temperature to meet the inlet requirements of the Pressurized Air Conditioning Kit (PACK). This paper aims to understand the impact of the conventional AMS on the engine performance and proposes an alternative AMS architecture for effective utilization of the bleed off-take pressure and temperature. Subsequently, a steady-state 0D thermodynamic analysis of the conventional and alternative AMS architectures is carried out using PROOSIS™ software, to study their impact on engine performance for different mission phases. Based on this preliminary thermodynamic analysis the alternative AMS shows a potential improvement of the engine performance mainly in terms of the TSFC, up to 0.7% across different mission phases.