Active Thermal Switch for Dynamic Heat Transfer Control
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Solution Overview
Problem
Existing thermal management systems in vehicles and electronic devices struggle to adapt to changing thermal conditions, leading to unintended operation or failure in environments with varying temperature settings.
Innovation Solution
An active thermal switch assembly comprising a hot plate, a cold plate, and an actuator that allows for mechanical contact and separation, facilitating conductive heat transfer and enabling dynamic thermal management by controlling the separation distance between the plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the hot plate and cold plate are kept in mechanical contact to facilitate conductive heat transfer, then heat transfer efficiency is improved, but the system cannot adapt to changing thermal conditions which may require reduced heat transfer
Solution Approach 1:
The thermal switch incorporates an actuator that can dynamically change the state of the hot plate and cold plate from contact to separation, allowing the system to adapt its heat transfer characteristics in real-time based on thermal conditions. This transforms a static thermal connection into a dynamic, controllable one.
Solution Approach 2:
The system changes the physical parameter of plate separation distance to control heat transfer. When the actuator is activated, it changes the state from contact (high heat transfer) to separated (low heat transfer), effectively using parameter change to resolve the contradiction between maintaining efficient heat transfer and adapting to varying thermal conditions.
2Device complexity
If a fixed thermal management configuration is used, then system simplicity is maintained, but the system becomes ineffective or detrimental when environmental thermal conditions change
Solution Approach 1:
By introducing a controllable actuator mechanism, the system transitions from a fixed, simple configuration to a dynamic one that can adapt its thermal management characteristics. The actuator allows the plates to move between contact and separation states, enabling the system to maintain reliability across different thermal environments while adding only minimal complexity.
3Loss of energy
If the plates are separated to reduce conductive heat transfer in cold environments, then thermal loss is reduced, but heat transfer efficiency drops when heating is needed
Solution Approach 1:
The actuator controls the separation distance parameter between the hot plate and cold plate, allowing the system to adjust heat transfer levels dynamically. When heating is needed, the plates are brought into contact for efficient heat transfer; when thermal loss needs reduction, the plates are separated. This parameter control resolves the contradiction between reducing thermal loss and maintaining heat transfer efficiency.
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 active thermal switch effectively manages heat transfer by enabling or disabling conductive heat transfer between the hot and cold plates, thereby adapting to changing thermal conditions and enhancing the reliability and longevity of hardware in challenging environments.
Implementation Method 1
The actuator may cause the hot plate and the cold plate to come into mechanical contact, thereby achieving a closed state for the active thermal switch and facilitating conductive heat transfer between the two plates
Implementation Method 2
operating the actuator to introduce a gap between the hot plate and the cold plate (thus achieving an 'open' state) substantially reduces conductive heat transfer between the hot and cold plates accordingly
Implementation Method 3
Controlling the separation distance between the hot plate and cold plate may also be used as a method to modulate the thermal radiation between the two surfaces
Data Source
AI summary
An active thermal switch assembly according to aspects described herein may include a hot plate, a cold plate, and an actuator. The actuator may cause the hot plate and the cold plate to come into mechanical contact, thereby achieving a closed state for the active thermal switch and facilitating conductive heat transfer between the two plates. Convective/radiative heat transfer may have little effect as compared to conductive heat transfer (e.g., as may be the case in environments having reduced or no atmospheric pressure), such that operating the actuator to introduce a gap between the hot plate and the cold plate (thus achieving an “open” state) substantially reduces conductive heat transfer between the hot and cold plates accordingly. Controlling the separation distance between the hot plate and cold plate may also be used as a method to modulate the thermal radiation between the two surfaces.