The Status of Simulation of AMS in the LSS Large Space Simulator at ESTEC

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The Status of Simulation of AMS in the LSS (Large
Space Simulator) at ESTEC

• Presented by Zhongchao ZHAO (SDU)
  
• Wenjing DU
  (SDU)
• Ivan CORRADINO
  (CGS)

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Outline

• Objective
• Model description and validation
• Thermal simulations with the integrated model
• Conclusions
• Next steps

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Objective

• Define a suitable LSS sink temperature range for
  the AMS TV/TB test.
• Investigate the effect of heat pipe status on
  components thermal behavior when AMS is arranged
  with different orientations in LSS.

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Large Space Simulator (LSS) Model

• The LSS GMM provided by ESA
• - TRASYS model was delivered Jan 2006
• - CGS and SDU translated TRASYS to
• Thermal Desktop in Feb 2006
• - CGS and SDU ran in parallel a set of testing
  
• cases
• - Confirm the LSS model in Thermal Desktop
• correct by Mr. Appel from ESA

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LSS Model in Thermal Desktop
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Integrated GMM of AMS in LSS
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Integrated thermal model of AMS in LSS

• AMS system TMM version 3.4 is used for analyses
• LSS is simulated as a constant and uniform heat
  sink

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Validation of the Integrated Model between SDU
and CGS
This validates that the integrated model of
CGS/SDU is correct
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Thermal Analyses of the Integrated Model

• Five cases were selected
• (classified by the LSS temperature from 100K
  to 300K with a 50K increment)
• Two test configurations were calculated,
  corresponding to the working conditions of AMS
  in two different orientations.
• Heat pipes work when they are horizontal
• Heat pipes dont work when they are vertical

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Heat Pipe Distribution in Main Radiators
16 pieces (14 vertical2 horizontal)
20 pieces (18 vertical2 horizontal)
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• Main Radiator Internal Panel Temperature
  Distributions, TLSS 250K

TEST CONFIGURATION 1 AMS VERTICAL, NON-WORKING
HEAT PIPES
ºF
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• Main Radiator Internal Panel Temperature
  Distributions, TLSS 250K

TEST CONFIGURATION 2 assuming AMS HORIZONTAL,
HEAT PIPES ARE WORKING
ºF
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Minimum temperature with different LSS
temperature and HP working / non-working
Obtained from reduced model for radiator
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Maximum temperature with different LSS
temperature and HP working / non-working
Obtained from reduced model for radiator
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• The previous calculations were done with a
  reduced model for the radiators, which is
  normally used only to calculate Interface Data
  with external environment.
• They should be checked again with the detailed
  model for the radiator, used for study of
  individual crate temperature distributions.

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Updated GMM of Main and Tracker Radiators in RAM
side
Reduced Model
Detailed Model
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Updated GMM of Main and Tracker Radiators in WAKE
side
Detailed Model
Reduced Model
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First results of the comparison

• First check for one case shows there are
  significant differences in crate temperature
  distributions between the reduced detailed
  models, so this study will be repeated with the
  detailed model.

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• Thermal Simulation Results for AMS Components not
  Mounted on Radiators

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LSS250K,the MAX,MIN and AVE temperatures (ºC)
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Conclusions

• With the increasing temperature of LSS, the
  temperature of AMS will increase correspondingly.
• The status of heat pipes will have a great
  effect on the Main Radiators electronic boxes,
  while the other AMS components dont change that
  much. The average temperature of radiator panel
  does not change depending on whether heat pipes
  are working or not.

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Next steps

• We have already imported the AMS model v 4.0 to
  the LSS and the validation of AMS v4.0 TMM with
  a detailed radiator model is still in progess.
• If this new model generates a big difference
  between components, we can use infrared lamps to
  locally warm up the cold spots to within their
  allowed (op, non-op) temperature range.