1. Thermal Control

2. 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

3. Basic Hardware Required
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

4. Thermal Control Calculated Temperature of Equipment and Spacecraft
PRT Monitor Equipment Temperature
Activate Heat for Thrusters
Assume Passive Thermal Control
Panel Heating ON/OFF
Structures | Propulsion | GN&C | Telecommunications | Carla

5. Plume Protection Trade Study
Material
Basic Information
Pros
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

6. Plume Protection Trade Study Cont.
Molybdenum
PICA
Density
Okay
Good
Space worthiness
Unknown
Temperature Appropriate

7. Basic Material Properties
Molybdenum Alloy (TZM)
Density of 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 g/cm3
Withstand at least 2700 degrees C
WILL UPDATE SLIDE WITH JUST ONE APPROPRIATE MATERIAL