Open Tdemuren15 opened 4 years ago
Here are some thoughts I have:
Current status:
Conclusion so far: the ANSYS model agrees with the final expected temperature of the body with the hand calculations. However, the modeling of the thermal transient involved suggests that there is non-zero hope that the outside structure of the satellite may insulate the batteries for some period of time. Key variable involved remains material properties, which are also the next large area of work.
Next steps:
Other stuff to do:
During meeting, also corrected for earth albedo - turns out that earth is incapable of reflecting sunlight while also blocking the sun at the same time. Heat flux reduced to ambient earth IR output value instead.
Increased mesh resolution. Redoing convergence study.
Found some more material data on FR-4 here: https://www.electronics-cooling.com/2002/08/simplified-transient-model-for-ic-packages/
Other next moves: remove a couple of unnecessary features from the part.
Goals coming out of Monday meeting with Manchester:
Docs on how to set up transient thermal conditions: https://www.clear.rice.edu/mech517/WB16/lectures_trainee/Mechanical_Intro_16.0_L10_Multistep_Analysis.pdf
Update material properties of components for greater accuracy
Fine tune model to factor in radiation and conduction