Cryogenic Systems Integration Model (CSIM)
The Cryogenic Systems Integration Model (CSIM), is an interactive PC “Windows” based software tool for the simulation and analysis of spacecraft cryogenic mechanical refrigeration thermal control systems.
CSIM development was initiated in response to a need for an encompassing and efficient method for design and analysis of spacecraft cryogenic mechanical refrigeration systems. Previous experience has shown that cryogenic systems exhibit large analytical uncertainties  and that thermal integration is often critical and inadequately considered during the preliminary design phase resulting in revisions during later phases.
The program was compiled for a PC platform and uses the Microsoft Windows Graphical User Interface. CSIM includes design algorithms, subroutines, and databases to allow the user to conduct analyses and trade-offs necessary to complete the design integration and simulation of a complete cryogenic refrigeration system. CSIM input requirements include instrument load and temperature, cryocooler selection, intermediate shield and sink temperatures, radiator and bracket materials, options to incorporate thermal storage units, heat pipes, and thermal switches, and the selection of redundancy and thermal margin factors. CSIM outputs provide a complete breakdown of temperatures, heat flows, dimensions, weight, power and total system penalties. Algorithms are incorporated to model conduction bars, flexible straps, thermal storage units (both sensible and phase change), parasitic heat loads, cryocoolers (cooling capacity, power, weight, and heat dissipation), heat pipes (for either cold transport or waste heat rejection), cryocooler brackets, and radiators.
Several databases are provided within the program which can be enhanced or modified by the user. These databases include the performance characteristics of a variety of production and developmental cryocoolers, temperature dependent thermophysical properties of 160 materials, phase change characteristics of 21 materials from 14 K to 195 K, and performance data for 8 fluids from 16 K to 600 K for a universal axial groove heat pipe configuration.
KeywordsHeat Pipe Phase Change Material Thermal Storage Power Penalty Thermal Control System
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