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Tim Rebold. 01/22/09 Structures and Thermal Thermal Control Systems. Thermal Management Systems. Thermal Control Systems. Active. Sensors. Passive. Control Roll. Thermal Louvers. MLI. Coatings. Heaters. Thermostat. Thermistor. Electric. RTG. Applications: 1) Payload
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Tim Rebold 01/22/09 Structures and Thermal Thermal Control Systems [Tim Rebold] [STRC]
Thermal Management Systems Thermal Control Systems Active Sensors Passive Control Roll Thermal Louvers MLI Coatings Heaters Thermostat Thermistor Electric RTG Applications: 1) Payload 2) Computers & Spacecraft Hardware 3) Thruster Fuel Systems 4) Solar Arrays 5) Batteries [Tim Rebold] [STRC]
Active Thermal Control • Mean Power Consumption (W)8.7 24.7 1.3 1.6 6.6 • Heaters Hot Case Heater Cold Case Heater X Wing Heaters Longeron Heater Heat Dissipated (W) 8.9 24.9 1.4 1.8 - [Tim Rebold] [STRC] • Resistive Electric Heaters • Ulysses (367 kg) thermal management set-up • RTG’s • Apollo, Pioneer, Voyager, Viking, Galileo, Cassini, Ulysses • 525-4400 W heat output, 12.3-57.8 kg RTG mass
Backup Slides [Tim Rebold] [STRC] • References • http://ulysses-ops.jpl.esa.int/ulsfct/spacecraft/scframe.html • http://www.atk.com/Customer_Solutions_SpaceSystems/cs_ss_subsys_tms_tl.asp • http://en.wikipedia.org/wiki/Radioisotope_thermoelectric_generator#cite_note-GLB-11 • space@atk.com
[Tim Rebold] [STRC] • Future Work • Need operating temperature ranges on various spacecraft components • Output heat generated from electronics and heat dissipating devices • Spacecraft dimensions • Determine mass and size of thermal systems • Estimate cost
Thermal Louvers [Tim Rebold] [STRC] Vary radiation transfer of underlying surface (spaceflight hardware) Operates in -40 degrees C to +100 degrees C environment Weight is approximately 0.89 lbm/ft^2 of louver area
Thermal Louvers [Tim Rebold] [STRC] Factory selectable from 0 to 40 degrees C with a +/-2 degrees accuracy Factory selectable at either 10 or 18 degrees above the open temperature The louver assembly is fully qualified for spaceflight and has flown on the NASA/GSFC XTE and JPL STARDUST. Contact space@atk.com
Thermistors Images from http://www.thermistor.com/productDetails.php?prodID=68 (QTI website) [Tim Rebold] [STRC] • NASA Goddard SMD NTC Thermistor • made by QTI • meeting or exceeding all the requirements of NASA/GSFC S-311-P-827 • operating temperature range: -55°C to +125°C
Ulysses Configuration Images from http://ulysses-ops.jpl.esa.int/ulsfct/spacecraft/scframe.html (JPL website) [Tim Rebold] [STRC]
RTG models for space Table basedfrom http://en.wikipedia.org/wiki/Radioisotope_thermoelectric_generator [Tim Rebold] [STRC]