Nesting of mathematical thermal model of the Russian ACS instrument in the TGO European spacecraft integrated model of the Exomars mission

It is shown on the example of ExoMars that problem of combining mathematical thermal models of separate device in the unified instruments assembly model can be solved with help of nodal method, based on the graph algorithm. Despite the nodal models simplicity they have benefits which do nodal models extremely useful for space devices modeling. This method has been applied to nesting of Russian ACS instrument thermal model in ExoMars European instruments assembly model. Comparison of calculation results and telemetric temperatures of ACS shows that nodal modeling errors can be lowered to the level at which the nodal models can be used as the main simulation instruments for space devices.