Payload Module thermal control

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Payload Module thermal control

08 IAN. 2002 4751

Thermal control of the PLM is passive (i.e. radiators and MLI) and supplemented by heaters.

These are the main elements of the thermal control:

Multi-Layer-Insulation (MLI)
flexible Second Surface Mirror Radiators
thermal doublers to spread the heat of high dissipating units
black paint on inner side of PLM panels
hardware controlled heaters
software controlled heaters
monitoring thermistors

Hardware controlled heaters use thermostats and maintain minimum non-operating temperatures to allow immediate activation of the:

Payload Module Computer (PMC)
Thermal Control Unit (TCU)
Power Distribution Unit (PDU)
Power Control Unit (PCU)

Software controlled heaters are controlled by the PMC on the basis of thermistor readings and defined temperature limits. They are used for warm-up and for control of operational temperatures.

Most instruments have their own thermal control and are thermally de-coupled from the PLM structure. For the Advanced Very High Resolution Radiometer (AVHRR), High Resolution Infra-Red Sounder (HIRS) and the Search and Rescue Repeater (SARR) instruments, baseplate temperatures are controlled by the PLM.

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Payload Module

The Payload Module (PLM) provides the main supporting structure for both the payload instruments and the payload support systems. Instrument sensors and antennae are mounted on the external panels, while most of the electronic units are accommodated inside the PLM.The accommodation of the large suite of instruments is a significant design driver for the overall PLM configuration. The PLM also houses all of the avionics necessary for power regulation and distribution, command and control, and the handling of scientific data.The Payload Module (PLM) is the main supporting structure for the complement of instruments and various deployable features. The internal design of the PLM allows these instruments to work optimally.

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Payload Module structural support

PLM structural designThe MetOp PLM structural design concept is based on the Environmental Satellite (Envisat) and consists of a 'box' shape structure with a central cylinder as the main structural load path to the Service Module (SVM). The PLM structures can be categorised as being primary or secondary structural elements.

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