Multiphysics modeling of sorption compressors: A FEM-based thermo-adsorption framework

Sorption compressor-based cryocoolers address the need for low-vibration cooling in both space and ground-based applications. To investigate the operation of the core element of these systems — the sorption compressor — a multiphysics modeling framework was developed. The modeling methodology integrates the modified Dubinin–Astakhov adsorption model, a Brinkman-based porous-flow formulation, and the conservation laws of mass and energy. Three distinct spatial representations of a sorption cell design (a 1D-axisymmetric, a 2D-profile, and a 2D-axisymmetric model) were then implemented to demonstrate the methodology. In all cases, model predictions show satisfactory agreement with available experimental data. • Multiphysics FEM framework developed specifically for sorption compressor cells. • Model couples adsorption equilibrium and porous media heat/mass transfer (Brinkman). • Three spatial fidelity levels are demonstrated for a cylindrical cell geometry. • Buffer sub-model provides transient inflow/outflow compressor boundary conditions. • Framework allows flexible selection of spatial fidelity in compressor modeling.