Satellite Thermal Switch for DC Power Conservation
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Solution Overview
Problem
Small satellites in low earth orbit face challenges in conserving DC power due to extreme temperature fluctuations, as thermal radiators continue to radiate heat when powered off, requiring additional power from limited solar panels to heat temperature-sensitive components.
Innovation Solution
A thermal switch that can be moved between coupled and decoupled states, creating a vacuum gap between temperature-sensitive components and thermal radiators, reducing heat radiation and thus DC power consumption when the component is powered off, using an electromagnetically operated actuator like a solenoid coil or solenoid fasteners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thermal radiator remains coupled to the temperature sensitive component when powered off, then the component is protected from extreme cold, but the heater consumes additional DC power to compensate for continuous heat radiation
Solution Approach 1:
The thermal switch transitions the thermal coupling between the radiator and component from a static continuous state to a dynamic on-demand state. The switch is actuated based on real-time temperature conditions and power availability, allowing the system to adaptively couple or decouple the radiator rather than maintaining a fixed coupling state throughout operation
Solution Approach 2:
The harmful continuous heat radiation function is extracted from the thermal radiator system by introducing a thermal switch that can decouple the radiator when the component is powered off. This separates the heating function (when needed) from the radiating function (when not needed), allowing the radiator to be removed from the thermal path during off-periods to eliminate parasitic heat loss
2Use of energy by moving object
If the thermal radiator is thermally decoupled from the temperature sensitive component when powered off, then DC power consumption is reduced, but the component may be exposed to extreme temperature changes
Solution Approach 1:
The thermal switch system incorporates temperature sensing and control logic that continuously monitors the component temperature and power state. This feedback mechanism determines when to couple or decouple the radiator, ensuring the component remains within acceptable temperature ranges while maximizing power savings during off-periods
Solution Approach 2:
The thermal switch can be configured to couple the radiator to the component in advance before the component is powered on, or to maintain coupling during transitions. This preliminary action ensures the component is pre-heated or protected from extreme cold before full operation begins, preventing temperature shocks
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The thermal switch effectively conserves DC power by preventing unnecessary heat radiation from the thermal radiator when the temperature-sensitive component is powered off, reducing the need for additional heating power, thereby optimizing battery life in small satellites.
Implementation Method 1
the thermal radiator may continue to radiate heat to cold space
Implementation Method 2
The thermal switch may comprise an electromagnetically operated actuator
Data Source
AI summary
A satellite includes a satellite housing, a temperature sensitive component carried by the satellite housing, and a thermal radiator carried by the satellite housing. A thermal switch is movable between a coupled state and a decoupled state. In the coupled state, the temperature sensitive component and the thermal radiator are thermally coupled. In the decoupled state, the temperature sensitive component and the thermal radiator are thermally decoupled.