Development of a two-phase mechanically pumped loop (2ΦMPL) for the thermal dissipation management of spacecraft : Simulation and test results
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To face the thermal control challenges of future powerful telecommunication satellites, THALES ALENIA SPACE FRANCE (TAS-F), through several ESA and CNES contracts, is currently developing a two-phase mechanically pumped loop (2ΦMPL) to transport the heat dissipation from telecom payload dissipative equipment (antenna, repeater) to dedicated large deployable or fixed radiators. After introducing the general context of the development and thermal management operated through two- phase mechanically pumped loop (2ΦMPL), this paper gives firstly an overview of this thermal control solution and its advantages with respect to more classical solutions : Simplified payload accommodation, 3D units accommodation possibility, use of DPR and East & West panels if required to reject the power, centralized heating, cost reduction, RF harness mass reduction, RF performance improvement, AIV simplification, thermal performance improvement in terms of temperature gradient reduction between equipment and radiator, and isothermicity if required. In this first part, main challenges of this development will be presented as well. In a second part, a presentation of the current prototype, which is the central part of this development will be presented, with its different evolutions. Then, simulations (through dedicated fluidic tools and methodologies), which have allowed flight control laws definition and test predictions are presented, followed by test (done on a prototype) results and corresponding comparison between test and simulation results. At the end, perspectives and conclusions of this technology and its promising applications will be given in the paper.