thermal control. requirements define high level diagram of thermal control identify major components...
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Thermal Control
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Requirements
• Define high level diagram of thermal control• Identify major components required• Define system and hardware requirements
sufficiently to allow future thermal control architecture definition and hardware trade studies
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• Passive Thermal Control– Multilayer Insulation (MLI)– Surface Finishes
• Active Thermal Control– Panel (strip) heaters
• Closed switch controlled by PRTs (Platinum Resistance Thermometers) monitoring optimal temperature for spacecraft components
• Used to heat hydrazine thrusters before initial burns
Structures | Propulsion | GN&C | Telecommunications | Carla 3
Basic Hardware Required
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Thermal Control
Structures | Propulsion | GN&C | Telecommunications | Carla 4
Assume Passive Thermal Control
Calculated Temperature of Equipment and
Spacecraft
PRT Monitor Equipment
Temperature
Panel Heating ON/OFF
Activate Heat for Thrusters
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Plume Protection Trade StudyMaterial Basic
InformationPros Cons
Molybdenum Alloys
Used in turbine blades
Meets temperature requirements
Unsure of space worthiness
PICA Used as heat shield for entry into Earth/Mars atmospheres
Light weight, used in previous space missions
Unsure of cost
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Plume Protection Trade Study Cont.
Molybdenum PICA
Density Okay Good
Space worthiness Unknown Good
Temperature Appropriate
Good Good
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Basic Material Properties
Molybdenum Alloy (TZM)• Density of 10.22 g/cm3
• Melting temperature 2610 degrees C• Can retain integrity until at least 1300 degrees C
PICA (ablative material) (Phenolic Impregnated Carbon Ablators)• Used on heat shield of Stardust Sample Return Capsule• Designed by Lockheed Martin• Density of 0.224- 0.321 g/cm3
• Withstand at least 2700 degrees C
WILL UPDATE SLIDE WITH JUST ONE APPROPRIATE MATERIAL