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ENVIRONMENT CONTROL SECONDARY SYSTEM

Periodic Reporting for period 1 - EC2S (ENVIRONMENT CONTROL SECONDARY SYSTEM)

Reporting period: 2019-04-01 to 2020-03-31

The Environment control system plays a significant role in guaranteeing air quality and thermal comfort in the aircraft cabin. Nevertheless, standard ECS remains one of the main power consumer function in the aircraft. EC2S solution is to reduce the need of fresh flow from 70% to a much lower percentage by recycling and treating cabin air, downsizing the ECS system weight, fuel consumption, pollution and costs. The ambition is to design the first Air Recirculation System (named EC2S Environment Control Secondary System) by integrating the smartest Air treatment processes and Sensors and demonstrate its efficiency and certifiability on the CS2 regional aircraft ground demonstrator.
The main objectives of the project are :
• Objective 1: To define the architecture of the recirculation-air treatment system that regulates air treatment and optimizes the mix of outside and treated recirculated air, based upon airframer requirements.
• Objective 2: To map technologies in term of maturity and commercial availability for choice decision about technologies integration in the demonstrator
• Objective 3: Promote innovative technological bricks for specific air treatment functions.
• Objective 4: Build a demonstrator of an innovative Recirculation-air treating system in the REG Demonstrator.
Based on a study for the state of the art on air quality in aircraft cabins, the architecture of the innovative recirculation EC2S loop has been defined. The conception study of the different filter elements has been done in parallel to the definition of the sensor & monitoring strategy. Hence, PDR of the system has been validated.
The design and sizing of the prototypes has been performed by simulations and definition of each technological brick has been based on experimental characterizations at the labscale:
- Innovative technology of PES (Electrostatic precipitation) of Particle matters
- Photocatalytic treatment of VOC
- Dimensioning & optimization of CO2 adsorbing filter & recirculation process.

Additionally, the sensors integration & development for miniaturization and fine tuning of sensitivity to targeted poluttants have been realized and the monitoring preliminary architecture has been validated commonly to the system PDR milestone.
The ambition is to design the first Air Recirculation System (named EC2S Environment Control Secondary System) by integrating the smartest Air treatment processes and Sensors and demonstrate its efficiency and certifiability on the CS2 regional aircraft ground demonstrator. The EC2S is developing a premium level of filtration of the recirculated air in order to improve the use of recirculation into key flight phases. Three key elements are integrated into the recirculation loop: filtration of particle matters by innovative electrostatic precipitation (PES); filtration & treatment of CO2 and filtration & treatment of VOC by photocatalytic process. Based on the very low pressure drop performed by PES Filtration of PM, the global pressure drop shown by the complete system is similar to a standard HEPA system. Additionally, the recirculation loop is instrumented with selective miniaturized sensoring systems to monitor air quality on PM, CO2, VOC but also CO levels.
Hence, EC2S will demonstrate an unprecedented set of technologies in order to reach higher premium level of filtration to improve the recirculation of air in the cabin.
By consequence the EC2S project offers improved monitoring of cabin air quality while opening to fuel consumption & CO2 emissions gains by offering more flexibility on recirculation phases during key energy demanding flight phases.
DMU EC2S Integration into REG Demonstrator
EC2S-Components-MainCharacteristics
EC2S - LabScaleProtoVOC