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Investigation of Carbon Fiber Support Structures in CO2 Cooling System for Detector Technology

This study explores the performance of carbon fiber support structures in a CO2 cooling system for detector technology through experimental and theoretical analyses. Various tests and simulations were conducted to assess heat transfer and thermal contact characteristics, leading to insights into system optimization.

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Investigation of Carbon Fiber Support Structures in CO2 Cooling System for Detector Technology

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  1. Physics Department Detector Technology Group Pixel CO2 Cooling Tests

  2. B187 CO2Test Setup CO2 Blow-systemProcessPath C A B D B A Pressure [Bar] E F C D F E Enthalpy [kJ/kg] JoãoNoite

  3. BPixCoolingTubeTesting BPixCoolingLayout: Experimental vs Theorectical: BPixLayer #1 L=5.5m ID=1.4mm T=-20°C P=150W João Noite

  4. BPixMock-upTesting • SS 1.4 mm ID coolingtube. • 5.5 m total tubelength. • 9x 180°tubebends, 7mm radius. • 8x 54x18 mm SS heatingplates. • Powerfrom 50 to 200 W. • CO2 temperature -20°C and -30°C. • CO2 massflowfrom 1 to 1.5g/s. S3 S1 S7 S9 S5 S8 S2 S4 S6 P3 P2 P1 P6 P5 P4 S10 P7 P9 P8 P11 P12 P10 João Noite

  5. FPixCoolingTubeTesting FPixCoolingStructure: Experimental vs Theorectical: FPixTubeL=1m ID=1.4mm Pmax=124W T=-30 to 9°C João Noite

  6. BPixCarbonFiberSupportStructure – T300J vs K1100 ANSYS Calculation T300J: • BPix¼Module: • SS Tube OD=1.6mm • ROC Simulated Power=3W • SupportStructure Material: • - CarbonFiber T300J, k=10W/m.K • - CarbonFiber K1100, k=500W/m.K • Glue: Epoxy, k=0.35W/mK • Mainobservations: • K1100 - ΔT=1.35°C • T300J – ΔT=10.4°C ANSYS Calculation K1100: João Noite

  7. ThermalContactTest Experimental Models: SimulationModels: João Noite

  8. ThermalContact - ANSYS Calculations • ThermalContactModel 1: • SS Tube OD=1.6mm • Pmax=3W→2778W/m2 • Epoxy: k=0.35W/m.K • Copper: k=400W/m.K • CarbonFiber: k=10W/m.K • Mainobservations: • Power=3W - ΔT=13.7°C • ThermalContactModel 2: • SS Tube OD=1.6mm • Pmax=3W→2778W/m2 • Conductive Paste: k=0.35W/mK • Mainobservations: • Power=3W - ΔT=3.7°C João Noite

  9. Conclusions • Software of some correlations are now fully debugged an operational. • Interesting differences between calculations and measurements remain. • FPIX tube can reliably cool the requested heat load of 124 W. • ΔT over tube length < 3°C • ΔT due to HTC < 3°C • CalculationsoftheBPixstructure show thatthe use ofhighconductivefibersgivesmuchbetter performance, ΔT<2°C. • Designingthethermal interface betweenthetubeandthecarbonstructurestillrequiresmuchwork. João Noite

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