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Thermal Control Subsystem Impact Heat Thermal Model

Thermal Control Subsystem Impact Heat Thermal Model. Stephane Charbonneau. Presentation Outline. Heat Created from Impact Phase Thermal Model Instrument Temperatures Phase Change Material Future Work. Heat Created from Impact Phase. Kinetic energy equation(25% to 50% is impact heat):

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Thermal Control Subsystem Impact Heat Thermal Model

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  1. Thermal Control Subsystem Impact Heat Thermal Model Stephane Charbonneau

  2. Presentation Outline • Heat Created from Impact Phase • Thermal Model • Instrument Temperatures • Phase Change Material • Future Work Stephane Charbonneau

  3. Heat Created from Impact Phase • Kinetic energy equation(25% to 50% is impact heat): • Deep-Space 2 experimental data: • nose cone temp: 800 K and 1000 K • body temp: 333 K and 380 K Stephane Charbonneau

  4. Thermal Model • Using I-DEAS TMG software • Can set different material properties, temperatures, geometries • Assuming: • solid aluminum • experimental impact heat data • conic nose shape Stephane Charbonneau

  5. Thermal Model • Meshing key to setting boundary conditions • Must find balance between computation time and size of mesh Stephane Charbonneau

  6. Thermal Model • Steady state results using TMG analysis • Heat stops about 2 cm into the regolith Stephane Charbonneau

  7. Instrument Temperatures • Battery survival temperature is limiting factor (-30°C) • Communications operating temperature is limiting factor( -20°C to 50°C) Stephane Charbonneau

  8. Instrument Temperatures • Instruments may be placed according to temperature limitations • Antenna already near top • Payload must be near bottom • Still need more component data Stephane Charbonneau

  9. Phase Change Material • Absorbs heat as phase changes • Solid to liquid phase change is preferable • Adds extra volume • Still have to get rid of heat Stephane Charbonneau

  10. Phase Change Material • Stores energy (will need to be released) • Mass equation for phase change material(heat of fusion 238 J/kg): • Where mass [kg] and heat [Wh] Stephane Charbonneau

  11. Stephane Charbonneau

  12. Future Work • Continue to iterate TMG model as design is refined • Transient results • Model subsystem components • Find heat generated by internal electronics Stephane Charbonneau

  13. Gantt Chart Stephane Charbonneau

  14. Questions?

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