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Description of design principles of thermocontrol system for small subsatellites Magion- 4, 5 and thermal behavior during two years of flight exploitation are presented. Passive type of thermocontrol system is intended to support the temperature level (-10…50) °C in inner volume of equipment compartment at solar subsatellite orientation and in temporary Earth shadow. Heat energy balance of the object at required temperature range is provided by utilization of radiating surfaces with defined areas, by thermal coupling of hot and cold subsatellite parts and by adaptation of constructive subsatellite elements to solve thermal tasks. Survey of telemetric date concerns temperature state of the main major parts of satellite are under consideration as well.

Description of design principles of thermocontrol system for small subsatellites “Magion - 4, 5” is presented. Passive type of system is intended to support the temperature level (-10…50) °C in inner volume of equipment compartment at solar subsatellite orientation and in temporary Earth shadow. Heat energy balance of object at necessary temperature range is provided by utilization of radiating surfaces with defined areas, by thermal connection of hot and cold subsatellite parts and by adaptation of constructive subsatellite elements to solve thermal tasks. Stages of heat pipe design, its development and testing separately and installed into object, thermovacuum test of subsatellite are presented. Initial time range of flight operation of thermocontrol system is analyzed as well.