Optimal design of a Thermodynamic Vent System for cryogenic propellant storage

International audienceFuture operations in space exploration require to store cryogenic liquids for long duration. Residual heatloads, due to heat conduction in the launcher structure or solar radiation, induce cryogenic propellantvaporization and tank self-pressurization. The Thermodynamic Vent System (TVS) permits to controlself-pressurization using the following procedure: a fraction of liquid propellant is removed from thetank by a pump, cooled down by a heat exchanger and re-injected inside the tank as a jet or a spray.As no natural heat sink is available in space, the cold source is created by removing another fraction ofliquid propellant which is expanded in a Joule-Thomson valve and vented to space. The sub-cooled injectionis followed by vapor condensation and liquid bath destratification due to mixing. In this work, anoptimization method is applied to an extended homogeneous thermodynamic model to design a TVS systemmaximizing the storage duration under various heat load and tank size assumptions