18-20 October 2022
Europe/Amsterdam timezone

Radiator Shadowing System (RSS) to save dissipation power

19 Oct 2022, 14:30


thermal control technologies Thermal Control


Nicolas RAYNAL


The Airbus Defence and Space Eurostar NEO development program has qualified a new system to cover OSR in order to limit the thermal rejection into space dissipated inside the spacecraft. During critical phase of the satellite lifetime as the Electrical Orbit Raising (EOR) phases or chemical transfer, an important part of the available electrical power is used to heat up the payload units to maintain them in their thermal limits.
Using the RSS allows to limit this important power dissipation and reducing the solar array and/or battery size. Moreover for EOR case, the power saved by the RSS make the phase last shorter.
The RSS qualified design is based on one single Rotary actuator driving two foils in both direction. Foils are wrap around winding module. Two main position can be set, one called “stowed” when foils are fully rolled around their winding module and “deployed” (as shown in the figure above) when covering the OSR.
The qualification model demonstrates the ability of the RSS to operate outside the satellite in a large temperature range (-90°C/+160°C) and for a life time covering the telecom mission needs. Moreover, mechanical (vibration and shock) test campaign was performed successfully.
The RSS qualified version is able to cover around 3,3m² in deployed configuration. The dimensions can be adjusted depending on the mission or on the satellite size

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