1 Tracker Thermal Control System AMS Tracker Thermal AMS Tracker Thermal Control System (TTCS) Control System (TTCS) TTCS Design Description TTCS Design Description NLR-team: J. van Es, M.P.A.M. Brouwer, B. Verlaat (NIKHEF), A. Pauw, G. van Donk, T. Zwartbol, CAM. Rens, SM. Bardet Sun Yat-Sen University team: ZH. He, KH. Guo, JQ. Ni, SS. Lu, XZ. Wang, XM. Qi, TX. Li, YH Huang INFN-AMS-team: R. Batiston, M. Menichelli et al.
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1
Tracker Thermal Control System
AMS Tracker Thermal Control AMS Tracker Thermal Control System (TTCS)System (TTCS)
TTCS Design DescriptionTTCS Design DescriptionNLR-team: J. van Es, M.P.A.M. Brouwer, B. Verlaat (NIKHEF), A. Pauw, G. van
Donk, T. Zwartbol, CAM. Rens, SM. BardetSun Yat-Sen University team: ZH. He, KH. Guo, JQ. Ni, SS. Lu, XZ. Wang, XM.
Qi, TX. Li, YH Huang INFN-AMS-team: R. Batiston, M. Menichelli et al.
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Tracker Thermal Control System
Wake heat pipe radiator
Ram heat pipe radiator
TTCS com-ponent box
Condensers
Evaporator• Requirements summary
• System Lay-out & Operation
• Tube routing & condenser
• TTCS-Boxes
• Components
– Pump
– Heat exchanger
– OHP
• Safety approach
• Design challenges
• Integration
ContentsContents
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Tracker Thermal Control System
Requirements SummaryRequirements SummarySilicon wafer thermal requirements Hybrid circuit thermal requirements Operating temperature: Operating temperature: -10˚C / +25˚C -10˚C / +25˚C Survival temperature: Survival temperature: -20˚C / +40˚C -20˚C / +40˚C Temperature stability: Temperature stability: 3˚C per orbit 3˚C per orbit Maximum allowed gradient between any silicon: 10.0˚C Dissipated heat: Dissipated heat: 2.0 W EOL 144 W total (±10%)
0.75 W per hybrid pair (S=0.47 W, K=0.28 W)
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Tracker Thermal Control System
TTCS Fluid temperature ranges • Operating Temperature loop (set-point): -15˚C / +15˚C
Loop temperatures in the single-phase part can be -40˚C / +15˚C
• Start-up temperature (driving requirement): -40 ˚C / 10 ˚C
Requirements SummaryRequirements Summary
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Tracker Thermal Control System
AMS- Tracker Thermal Control System MDP determinationAMS- Tracker Thermal Control System MDP determinationConstraint 1: max allowed system fill ratio=f (MDP, MDT)
NASA : shuttle Earth Max Design Temp (MDT)= 65 °CGiven the temperature, now FRSYSTEM is only a function of MDPAMS-team: MDP is set to 160 bar
RAM and WAKE heat sinks are forced to thermal model radiator temperature profile
HX out
Tem
pera
ture
[C
]
Time [s]
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Tracker Thermal Control System
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Tracker Thermal Control System
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Tracker Thermal Control System
TTCS Functionality TTCS Functionality Component Function Pump Transport the fluid through the loop Accumulator Regulate the evaporator temperature in the tracker
Account for the expansion of the working fluid Accumulator Peltier elements Regulate evaporation set-point in all operation modes (cooling) Accumulator heaters Regulate evaporation set-point in all operation modes (heating)
Emergency accumulator heat-up in case liquid line temperature approaches saturation temperature (to avoid cavitation in pump)
Valves (liquid line) Control the mass flow distribution between Wake and RAM radiator
Heat Exchanger Exchange heat between hot evaporator outlet and cold evaporator inlet. Reduction of pre-heater power
Evaporator Collect heat at the tracker electronics. The evaporation process provides the temperature stability required.
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Tracker Thermal Control System
TTCS Functionality TTCS Functionality
Condensers Remove the heat from the working fluid to the radiators. The condensing process makes the heat transfer effective.
Absolute Pressure Sensors Monitor the absolute pressure inside the loop Differential Pressure Sensor Monitor pump pressure head LFM Monitor mass flow Pre-heaters Heat evaporator liquid inlet to saturation point Start-up heaters Additional heater for cold start-up (off during nominal
operation) Dallas Temperature Sensors Monitor temperatures TTCS temperatures Pt1000 Temperature Sensors Control pre-heater power
Control accumulator temperature Control liquid line valves (under discussion) Monitor cold temperatures on radiator and liquid lines