NOAA KLM User's Guide
The TCS consist of active and passive thermal control equipment. The TCS maintains unit temperatures within the specified operating range, generally within limits of 0 to 35 degrees Celsius (C). A combination of onboard and nonflight thermal control is required during test or prelaunch phase.
Passive thermal control is effected by the appropriate use of multilayer insulation blankets, aluminized teflon thermal shielding, special finishes, and thermal-conduction-control materials. The major active elements of the TCS are heaters and louver-controlled cooling radiators. There are two types of louvers: vane louvers and pinwheel louvers, both controlled by Thermal Control Electronics (TCE) units. The satellite incorporates a safe-state mode of operation where, in the event of a major anomaly such as loss of proper attitude, a powered-down state is automatically entered. Under this condition, TCS heaters maintain critical equipment, including instruments, at a safe temperature until mission operations can be re-established.
The thermal control system is designed to achieve satellite thermal control for all Sun angles between 0 degrees to 80 degrees. The TCS functions include the following:
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