Thermo-dynamical process simulation of dilution refrigerator

• Development of numerical simulation model (SIDFO) for dilution refrigerator.
• Design analysis and optimization of a dilution refrigerator through SIDFO.
• Validation of the simulation results with operational machines.
• Integrated close cycle simulation with all components.
• Performance at arbitrary flow rates and effect of varying 4He concentration in the circulating 3He gas.

The design, analysis and optimization of a dilution refrigerator are carried via simulation of the thermo dynamical processes. To this end we have developed a comprehensive numerical simulation model, SIDFO (Simulation of Integrated Dilution Refrigerator for Optimization) based on enthalpy – balance considerations taking into account for several important micro-effects which are normally ignored by existing methods. The simulation has produced several unique results of the underlying phenomena occurring at various stages of the very low temperature process presented in this paper. The corresponding simulation results are compared with published experimental data of operational machines and found to comply well. The presence of 4He in the circulating gas and its consequences for the generalized cooling power is also thoroughly examined here.