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PACS Thermal Analysis

PACS Thermal Analysis. Dr. L. Morgenroth CASE GmbH. PACS Thermal Model. PACS TMM: 7 Boundary Nodes 185 Diffusion Nodes Input-Status: 22. Feb. 2002 Model includes: - all Mechanisms - all Harness - Possibility of transient Analysis - Radiation Environment Model excludes:

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PACS Thermal Analysis

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  1. PACS Thermal Analysis Dr. L. Morgenroth CASE GmbH PACS Thermal Analysis

  2. PACS Thermal Model PACS TMM: 7 Boundary Nodes 185 Diffusion Nodes Input-Status: 22. Feb. 2002 Model includes: - all Mechanisms - all Harness - Possibility of transient Analysis - Radiation Environment Model excludes: - Cryostat TMM PACS Thermal Analysis

  3. PACS Heat Dissipation (with 20 % margin) PACS Thermal Analysis

  4. PACS Boundary-Temperatures (stationary) • These temperatures are stationary ESTEC-results from Feb. 2002. • The transient behavior of the boundary temperatures is neglected. • The optical bench temperatures are about 2 to 2.5 K higher than the values used for the analysis in September 2001. -> Higher Flux from Optical Bench through Struts to Level 1 PACS Thermal Analysis

  5. PACS Detector-Temperatures(depending on Copper-Type for Cooling-Straps) PACS Thermal Analysis

  6. Sensitivity of PACS Temperatures(to varying Boundary-Temperatures) PACS Thermal Analysis

  7. Sensitivity of PACS Heat Fluxes Uncertainty in CFRP properties: If the predicted conductivity of the CFRP of the PACS suspension struts would be doubled, the average heat load to Level 1 increases from 11 to 16 mW. Measurements are intended. PACS Thermal Analysis

  8. Summary • The average PACS heat dissipation is 2.9 mW (2.9 - 3.3 mW) to LHe and 11.0 mW (9.0 - 12.4 mW) to Level 1. • The main difference to the results of the analysis from Sept. 2001 is an increase of the average dissipation to Level 1 by about 2.4 mW. This mainly results from higher optical bench temperatures. • The sensitivity of the PACS-Detector temperatures to the boundary temperatures is low. • It is recommended to use high-conductivity-Cu for the cooling-straps of the Red Spectrometer and the Photometer and standard-ISO-Cu for the Blue Spectrometer. • For transient calculations with transient Level 1- and Optical Bench- temperatures a TMM of the Cryostat has to be included. PACS Thermal Analysis

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