Thermal control status

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Thermal control status

• M. Molina, J. Burger

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Do you remember Chiara (Pini)?
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Nicola (Born in Milano Jan 8th 2006) and Chiara
are fine!!
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Thermal Working Group meeting Milano, 14-16
December 2005

• TCS Mass saving
• HV brick testing
• Star tracker test
• MLI optimization
• CAB TCS
• TTCS
• accumulator

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ASSUMPTIONS, REMARKS
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MLI optimization

• Out of 35 blankets
• 4 have been eliminated
• For 1 thickness changed from 20 to 10 layers
• For 22 thickness changed from 20 to 7 layers
• For 7 thickness changed from 20 to 1 layer
• Fixation
• 17 blankets lacing
• 18 blankets pins (heavier) are needed

-10.6 Kg
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MLI characteristics
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PROPOSED REDUCTION STATUS
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PROPOSED REDUCTION STATUSAccepted
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Cryocoolers and LHP
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Thermal Design Ideas of Cryocooler

• Redundancy Design
• Failure cases on China satellite(FY-1C)
• 6 LHP were applied in the thermal control
  system on FY-1
• One of them was failed just after launching
• Another one was failed 24 months later.
• Restart by cooling the reservior, but failed
  again after one week.
• Failure cases on ICESAT(USA)
• 2003.2----launched,2 LHP
• 2003.9----The LHP on electronics showed some
  temperature spikes and then stop
  running---RESTARTED
• 2004.4----Temperature spikes appeared again
  but under control till 2004.9

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Thermal Design Ideas of Cryocooler

• Using mini-heat pipes to uniform temperature of
  the cryocooler shell.

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TTCS
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REALISTIC MASS SAVING
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Total saving

• STARTING FROM 43.8 Kg overweight
• 7.5 Kg beams
• 1.5 Kg Vacuum case Silvered teflon
• 10.6 Kg MLI (less layers, optimized fixation
  points)
• - 18.4 Kg (realistic saving)
• 20 Kg (TOTAL SAVING)

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Continuing effort

• Integrated analysis (survey)
• Deatiled design of MLI
• Precise determination of TTCS saving

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Testing

• Maddalena Cova

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Subdetectors ready for testing

• Star Tracker
• E R HV bricks
• Lower Tof

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Star Tracker Qualification Tests

• Scheduled from 6th to 18th February 2006
• Status
• Test Procedure delivered by C. Gargiulo
• Comments sent back, OK
• Facility (SERMS Terni) Ready
• Test Set Up
• Flange with feedthrough ready
• MLI will be delivered by CGS to SERMS next Monday
• Contact person
• Corrado Gargiulo (INFN ROMA)

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Star Tracker QM
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HV bricks Qualification Test

• RICH HV brick (valid also for ECAL HV brick )
• Scheduled 1st March 2006
• Status
• Test Procedure prepared on the basis of CGS Test
  Specification
• Second issue (after yesterday meeting) to come
  next week
• Facility Terni (TBC)
• Contact person
• Eduardo Cortina (CIEMAT)

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HV Bricks Test Levels
8 cycles 4 cycles
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HV bricks
TRP Temperature Reference Point
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Lower Tof Acceptance Test

• Schedule April/May 2006
• Status
• Test Procedure Ready
• Facility (Terni) ready at the end of February 06
  (Delivery date of the flange)
• Contact person
• Federico Palmonari (INFN - BO)

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Terni (SERMS) Facility
TV Chamber
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Terni TV Chamber

• Chamber dimensions 2100 x 2100 mm
• Pressure range 1000 mbar to 3x10-5 mbar (10-7
  mbar reached during commissioning)
• Temperature range -70C 125 C
• Temperature gradient 1 C/minute
• Temperature stability /- 1 degree
• 3 cold plates (mounted on the inner side of the
  front door)
• lower mm 500x1820 FOR STAR TRACKER
• mid mm 500x1970
• high mm 500x1550

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ESA Large Space Simulator(LSS)Thermal Model

• M. Cova, GM Xin, W. Du, Z. Zhao

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LSS Thermal model

• LSS TMM will be used for test predictions
• ESA translated LSS model from ESARAD (EU) to
  TRASYS (US, 1980)
• TRASYS model was delivered Jan 2006
• CGS/SDU translated TRASYS to Thermal Desktop (US,
  2000)
• Translation includes running a set of test cases

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LSS GMM
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LSS thermo-optical properties
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TRANSLATION CHECK

• To begin the model debugging we have calculated
  internal view factors, to be submitted to ESA for
  comparison
• The plan is to have the first analysis results of
  AMS inside the LSS in April 2006.
• Main decision shall we use solar beam or not?

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LSS Radks
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• LHP EM Testing Definition of Test Set-up
• S. Zinna (UNIBG) Y. QU (SDU)
• M. Molina (CGS) G.M.XIN (SDU)

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Contents

• Introduction
• Status of design
• Boundary Conditions
• Insulation design
• Working Fluid Selection
• Refrigerator
• Conclusion

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Introduction
LHP-System
Temperature Requirements Min. turn-on and oper
- 10C (TBC) Max. oper
40C Min. non-oper and
survival - 40C Max. non-oper and survival
40C Dissipation heat lift Minimum 60
3 Watts/ Cryocooler Nominal 100 5 Watts/
Cryocooler Maximum 150 8 Watts/ Cryocooler
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Ground Test of LHP EM

• A LHP EM is planned to be delivered to SDU, and a
  ground test will be performed there.
• This presentation shows the preliminary thermal
  design of the chamber, built last year.

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Cooperating with CGS, Mr. S. Zinna (phD
candidate from Bergamo University - Italy) is
working on the chamber design together with
people in SDU (China) since November 2005. A
meeting was held in Milano, Jan 17th, 2006 .
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General Idea
Heat insulating layer
Interlayer
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Boundary Conditions

• In the present thermal chamber design, three
  different operating temperatures are considered.

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99 of average case will be covered by using case
3 (-90 ?) 88 of average case for case 2 (-60
?) 60 of average case for case1 (-30 ?)
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Heat Insulating Layer

• A heat insulating layer around thermal chamber is
  needed to reduce the heat leak from the ambient
  environment, which could be as high as gt12000 W
  when Tamb28?, Twall-60?.
• Therefore, an insulating layer made of Armaflex
  is analyzed.

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Working Fluid Selection

• Based the temperature range, properties and cost
  of fluid, the R141b was selected to be the
  working fluid in the present design, and it is
  possible to maintain the full temperature range
  proposed.

Propylene Glycol is analyzed also but only
possible for a limited range. (case 1 and part of
case 2)
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Refrigerator

• To compensate the heat leak from outside and heat
  dissipation from LHP EM, a refrigerator system is
  needed to circulate the working fluid and cool it
  down to the required temperature.

• For all the cases, a refrigerator having a
  cooling capability of 2000W_at_-90 ? is needed.
  Considering a smaller range (case1 and case 2),
  1500W _at_-60 ? is needed.

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Conclusion

• The preliminary design of test facility for LHP
  EM is finished
• Calculation based on R141b as the working fluid.
• Insulation around the thermal chamber designed,
  to prevent the heat leak from ambient
  environment.
• The refrigerator system having a high cooling
  capability is needed for the required temperature
  range.
• Still, more efforts needed
• Refinement of calculation.
• Dry air system design.
• Start procurement of components. (May, 2006)
• Target date for chamber ready (Dec 21st, 2006)

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120V Heaters progress report- SSRMS / PVGF
power requirements- Cryo-cooler heater fault-on
analysis

• C. Vettore
• G.M. Xin

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AMS-02 power requirement

• SSRMS / PVGF power requirements this is the
  critical step!

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Provided by T.Urban
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SSRMS power budget (AMS-02)
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Is AMS-02 compliant to the SSRMS power
requirement ?
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• SSRMS / PVGF power requirements
• are defined in different terms in two
• separate paragraphs in SSP 57003.
• SPP 57003 Attached Payload Interface
  Requirements Document Revision A August 5,
  2002
• SPP 42004 Mobile Servicing System (MSS) to
  User (Generic) Interface Control Document Part
  I Revision H October 31, 2003

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AMS-02 current drain shall not exceed 16.7amps
all along the voltage range
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3.7.6.2 EBCS AVIONICS PACKAGE POWER

• A. The payload shall route the PVGF cable to the
  EBCS Avionics Package and provide connections as
  indicated in SSP 57004, Figure 3.7.21. The
  Avionics Package uses power from the PVGF and
  also routes payload power from the PVGF to the
  payload, up to 1800 Watts if necessary.
• External Berthing Camera System

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Remarks

• The current drain can range from 0 to 16.7amps
  all along the voltage range (107.5V to 126V)
• The maximum payload power calculated as VmaxImax
  turns to be 2104W
• 2104W gt 1800W (allowed)
• If we consider voltage drop thru line, the
  maximum input voltage to be used is lower but
  still not enough to meet the 1800W

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Updates by T.Urban (Jan 31st, 2006)

• T.Urban has officialy communicated that the 1800W
  requirement is no longer applicable.
• WHAT DOES IT MEAN FOR AMS (AND HEATERS DESIGN)?

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• 16.7amps current requirement is met (all along
  the voltage range) and AMS 120V heater design is
  definetively approved

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Cryo-cooler heater fault-on analysis

• Scope to define if the cryo LHP heater is safety
  critical

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Cryo Fault heater analysis assumptions

• 1 LHP working (1 LHP failed)
• Cryo-cooler running at the maximum power, namely
  150W
• Heater stuck-on when supplied at the maximum
  voltage, namely 43W
• Hottest environment
• Overall power dissipation 150W 8W 43W 201W

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Analysis performed by G.M.Xin
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Cryo-cooler fault heater analysis results

• The saturation temperature of the LHP is 30C
• The corresponding saturation pressure is 13bar
• The Burst safety factor must be at least 4
• Burst pressure will be provided by CAST
• shall be at least 52 bar

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