Active systems Active systems are always a supplement to the passive ones. It involves mechanical moving parts and/or power consumption. They are characterized by their high mass, cost and power, lifetime constraints considerations, and their high heat transfer capabilities and adaptability in flight. The SGD-1 platform might have a network of heat pipes, which transfers heat generated by the internal subsystems to outer space. Some examples are given in Table 10.3.10: Table 10.3.10 Active Thermal Control Thermal Control Subsystem Interfaces The Thermal Control Subsystem (TCS) interfaces with nearly all other subsystems in the spacecraft. Some requirements and design drivers to TCS are listed in Table 10.3.11. This implies that: • TCS has many requirements and design drivers from other subsystems • TCS needs thermal information about other subsystems • TCS imposes thermal requirements and thermal interfaces to other subsystems • TCS is affected by most of the changes in other subsystems In fact, the thermal information of other subsystems is required for spacecraft analysis and hardware design. For example: • Mission phases (launch, maneuvers, deep space) • Configuration, geometry, dimensions • Mass • Material data (solar absorptivity, conductivity) • Instrument and subsystem equipment operation • Unit dissipations • Launcher interface • Heater bus(es) supply voltages ______ Table 10.3.11 Requirements and Design Drivers___________
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