Heat System
・System overview
The thermal system involves controlling the temperature of each piece of satellite equipment (electronic equipment, structural materials), etc. in the thermal environment in space during the entire mission period, so that each piece of equipment can operate under appropriate temperature conditions.
Temperature requirements differ depending on the equipment, so I will be responsible for the thermal design of the satellite and the subsystem that controls heat, taking these into consideration.
・System functions
One of the roles of the thermal system is to measure and monitor satellite temperature.
Because outer space is a vacuum, the only way heat can move is through radiation, and almost no heat escapes. Radiation is a phenomenon in which thermal energy is emitted from an object as electromagnetic waves.
Radiation from the sun is absorbed by the material on the surface of the spacecraft, and this becomes heat input. In addition, heat is removed by radiation from the materials on the surface of the spacecraft.
In this way, heat transfer in space is only by radiation, so compared to the ground, almost no heat escapes, and the temperature changes greatly depending on the position relative to the sun.
The battery is wrapped with nichrome wire, and the Joule heat generated when flowing through the nichrome wire warms the battery when it is lower than the operating temperature range, controlling the temperature appropriately.