Abstract
ABSTRACTWe present analytical models and a detailed numerical model of a two-stage space radiator with variable emissivity coating on its internal surfaces and we correlate them with experimental data to validate the numerical model. The feasibility of the radiator concept called VESPAR (Variable Emittance SPAce Radiator) is proven using an analytical model and confirmed by a numerical model. This numerical model is then used to compare the thermal performance of VESPAR and a conventional flat radiator. The comparison confirmed that the VESPAR radiator for satellite thermal control could lead to power savings for survival electric heaters or even its elimination.
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