The Environmental Control System, ECS, represents a constant power demand over the complete flight envelope, regardless of engine power settings and engine speeds. ECS objective is to create a suitable environment by controlling the environmental parameters, providing resources, and managing waste products. The Thesis is part of the H2020 STRATOFLY project that study the feasibility of a Hypersonic civil passenger transport aircraft concept, STRATOFLY MR3, that shall be able to cruise at 30 km altitude and Mach 8 flight speed with the primary goal to reduce flight time, noise and emissions. It is about an innovative way of conceiving air transport and so it is an interesting challenge for scientists and researchers since the idea is ambitious and probably will change the aerospace industry from the field of high-speed propulsion to high-temperature resistant materials.