A coupled numerical analysis of shield temperatures, heat losses and residual gas pressures in an evacuated super-insulation using thermal and fluid networks: Part I: Stationary conditions

摘要: This paper describes numerical simulations, using thermal networks, of shield temperatures and radiative conductive heat losses a super-insulated cryogenic storage tank operating at 77 K. Interactions between radiation transfer modes in the shields are investigated, by calculation local temperatures. As new method, fluid networks introduced for stationary residual gas pressure distribution evacuated multilayer super-insulation. Output from network is coupled to iterative calculations. Parameter tests concern thickness emissivity shields, degree perforation, sources like desorption spacers container walls, permeation inner insulation space. Variations either (thickness Al-film on Mylar) or parameter (thermal emissivity) exert crosswise influences tank, respectively.