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TTCS simulation status report

This report outlines the status of the Thermal Control System (TTCS) modeling and simulation results, focusing on both cold and hot orbital scenarios. Key modifications include revisions to the cmdv1.3 model, flow direction reversal, and considerations of contact conductance for the radiator's heatpipe interface. The cold case simulations indicate a required power of 40W for heaters to maintain operational integrity in extreme conditions. Hot case simulations reveal minor subcooling is adequate for system operation, necessitating adjustments in set points, mass flow rates, and pressure drops. Future work aims to improve model reliability.

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TTCS simulation status report

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  1. TTCS simulation status report SYSU: S.S.Lv, D.C. Mo, Z.C. Huang, Z.H. He NLR: E. van Johannes, P.Aswin CGS: C.Vettore, M.Molina

  2. Outline • Status of TTCS modeling • Simulation result • Cold orbit result • Hot orbit result • Summary

  3. Status of TTCS modeling • Modified and debugged the cmdv1.3 (combined model draft version 1.3) • Reversed the flow direction • Considered the contact conductance between the heatpipe and the facesheet of the radiator • Modified the thermal link of peltier • IF data debugged etc.

  4. Reverse the flow direction

  5. Contact conductance between the face sheet and HP Layers of the radiator R56`=8.27E4W/K à R56=181W/K R67`=3.07E5W/K à R67=188W/K R79`=171W/K à R79=209W/K

  6. Cases selected for simulation

  7. Results of cold cases

  8. Cold case1: BYPR=+75+15+15+15 Tset=258K FR=2g/s Cold orbit heaters Pre-heaters

  9. Cold case2: BYPR= +75-15_0+15 Tset=258K FR=2g/s Cold orbit heaters

  10. Cold case3: BYPR= -75_0_0-15 Tset=258K FR=2g/s

  11. Comparison of the cold orbit results

  12. Summary for cold case • The result of the cmdv1.3 shows that a power of 40W for the cold orbit heaters should be enough for keeping the loop running in the extreme cold cases.

  13. Hot cases

  14. BYPR=+75-15-20-15 Tset=293K FR=2g/s subcoolings

  15. BYPR=+75-15-20-15 2 phase

  16. BYPR=+75-15-20-15 Tset=293K FR=4g/s Pre-heaters

  17. Summary of the hot cases • In the extreme hottest cases, TTCS loop is running with little sub cooling. • Proposed solutions and impacts • Higher the set point • Higher the mass flow rate • Higher pressure drop of the loop (up to 1600mbar) • Higher the pre-heater power

  18. Future work • Building and debugging the TTCS v1.0 • modified the length and volume to the latest loop layout • More reliable accumulator model. • Involving of the tracker people in modeling is started, and to be strengthened.

  19. Thank you

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