1. AAE450 Spring 2009 Tim Rebold 01/22/09 Structures and Thermal Thermal Control Systems [Tim Rebold] [STRC]

2. AAE450 Spring 2009 Thermal Management Systems [Tim Rebold] [STRC] Thermal Control Systems ActivePassive Sensors Heaters Electric MLICoatings Control Roll ThermostatThermistor Applications: 1) Payload 2) Computers & Spacecraft Hardware 3) Thruster Fuel Systems 4) Solar Arrays 5) Batteries Thermal Louvers RTG

3. AAE450 Spring 2009 Active Thermal Control  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 [Tim Rebold] [STRC] Heaters Hot Case Heater Cold Case Heater X Wing Heaters Longeron Heater Mean Power Consumption (W) 8.7 24.7 1.3 1.6 6.6 Heat Dissipated (W) 8.9 24.9 1.4 1.8 -

4. AAE450 Spring 2009 Backup Slides  References –http://ulysses- ops.jpl.esa.int/ulsfct/spacecraft/scframe.htmlhttp://ulysses- ops.jpl.esa.int/ulsfct/spacecraft/scframe.html –http://www.atk.com/Customer_Solutions_Spa ceSystems/cs_ss_subsys_tms_tl.asphttp://www.atk.com/Customer_Solutions_Spa ceSystems/cs_ss_subsys_tms_tl.asp –http://en.wikipedia.org/wiki/Radioisotope_ther moelectric_generator#cite_note-GLB-11http://en.wikipedia.org/wiki/Radioisotope_ther moelectric_generator#cite_note-GLB-11 –space@atk.comspace@atk.com [Tim Rebold] [STRC]

5. AAE450 Spring 2009  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 [Tim Rebold] [STRC]

6. AAE450 Spring 2009 Thermal Louvers  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 [Tim Rebold] [STRC]

7. AAE450 Spring 2009 Thermal Louvers  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.comspace@atk.com [Tim Rebold] [STRC]

8. AAE450 Spring 2009 Thermistors  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 [Tim Rebold] [STRC] Images from http://www.thermistor.com/productDetails.php?prodID=68 (QTI website)http://www.thermistor.com/productDetails.php?prodID=68

9. AAE450 Spring 2009 Ulysses Configuration [Tim Rebold] [STRC] Images from http://ulysses-ops.jpl.esa.int/ulsfct/spacecraft/scframe.html (JPL website)http://ulysses-ops.jpl.esa.int/ulsfct/spacecraft/scframe.html

10. AAE450 Spring 2009 RTG models for space [Tim Rebold] [STRC] Table based from http://en.wikipedia.org/wiki/Radioisotope_thermoelectric_generatorhttp://en.wikipedia.org/wiki/Radioisotope_thermoelectric_generator