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VTC1.5 Thermal Vacuum Facility Sun Simulator design
Keywords: Sun Simulator, thermal simulation, thermal vacuum
Proposed area Mil/Aerospace Abstract This paper describes the VTC1.5 thermal vacuum facility Sun simulator. A Sun simulator is a device that provides illumination approximating Sun radiation in Space environment. VTC1.5 is a thermal-vacuum chamber equipped with a high flux solar simulator dedicated to spacecraft equipment testing. It provides radiant flux density up to 20 SC (~27500 W/m2) depending on the light beam diameter. The work addresses the thermal simulation of Sun Simulation in Thermal Vacuum Testing experiments in general. This approach enables more accurate simulation of the Space conditions in Thermal Vacuum Testing experiments and thus contributes to more reliable spacecraft design and space flight mission success. The 25 kW lamp module with the new optical system allows regulation of the irradiance on the target in the range of 8 till 13.5 solar constant. This is a typical range for space missions going close to the Sun, like European Space Agency’s Solar Orbiter and Bepicolombo. However, to be compatible with the large majority of space missions (that is in the range of 0.3 till 4 solar constant), a new light source module had to be designed as well. In facts, when the dynamic range of the irradiance varies significantly, it cannot be obtained using only current control. An important part of the design consists in making sure the optical system and its structure can survive continuous operation at the required high level of irradiance. The double wall of the SHF tube is water cooled and that serves as primary mean to evacuate heat. A simulation including conduction, radiation and convection has been carried out to assess the maximum temperatures seen by the lenses and the frames. Enrico Brega, R&D Engineer Thermal Management Specialist BLV GmbH USHIO Group Steinhöring, Bayern Germany
Enrico Brega, R&D Engineer Thermal Management Specialist
BLV Licht GmbH - USHIO Group
Steinhoering, Bayern

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