Variable Thermal Resistance System for Temperature Control
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Solution Overview
Problem
Temperature-sensitive electronic devices face challenges in maintaining stable performance across varying environmental temperatures, as existing methods require energy-intensive cooling or heating, and previous techniques like bimetallic switches lack granularity in thermal resistance adjustment.
Innovation Solution
A variable thermal resistance system using a thermally conductive path with a working fluid that expands and contracts based on temperature, allowing the device to maintain a constant temperature by adjusting thermal resistance in response to environmental changes, thereby minimizing the need for active heating or cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If active heating or cooling is used to maintain device temperature, then temperature stability is improved, but energy consumption increases
Solution Approach 1:
The device uses its own waste heat to maintain its operating temperature through the phase change material, eliminating the need for external heating or cooling systems. The PCM absorbs excess heat when the device generates more than needed and releases it when the device needs more heat, creating a self-regulating thermal management system.
Solution Approach 2:
The patent employs a phase change material that transitions between solid and liquid states at the device's operating temperature. During phase transition, the PCM absorbs or releases latent heat, maintaining stable temperature without requiring active thermal control systems, thereby dramatically reducing energy consumption.
2Temperature
If cooling systems are implemented to handle high environmental temperatures, then temperature control capability is improved, but device complexity increases
Solution Approach 1:
The patent extracts the thermal management function from complex active cooling systems and implements it through a passive phase change material integrated directly into the device housing. This eliminates the need for separate cooling components such as fans, heat sinks, and temperature sensors, simplifying the overall device architecture.
Solution Approach 2:
The thermal management function is merged with the device housing structure itself. The PCM is integrated into the housing, combining structural support and thermal regulation functions into a single component, thereby reducing device complexity while maintaining temperature control capability.
3Use of energy by moving object
If thermal resistance is increased to reduce heat transfer, then energy efficiency is improved, but temperature stability deteriorates
Solution Approach 1:
The patent implements dynamic thermal resistance through the phase change material, which automatically adjusts its thermal conductivity based on temperature conditions. When the device temperature rises above the operating point, the PCM melts and increases thermal resistance to prevent further temperature rise. When temperature drops, the PCM solidifies and decreases thermal resistance to allow heat transfer back to the device, maintaining temperature stability while improving energy 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
This solution enables efficient temperature regulation across a wide range of environmental temperatures with reduced power consumption, maintaining device performance without the need for extensive heating or cooling, and can be fabricated using MEMS manufacturing for scalability and precision.
Implementation Method 1
The well and channel may be sized to enable the working fluid to expand passively from the well into the channel and contract passively from the channel into the well in continuous amounts, where the amounts are a function of a temperature of the heatsink.
Implementation Method 2
The base also defines a channel disposed in a thermally conductive path between the mount and the heatsink, where the channel is in liquid communication with the well.
Implementation Method 3
the heatsink may absorb heat from, or conduct heat to, an external environment, where the temperature of the heatsink varies based on a temperature of the external environment
Data Source
AI summary
Electrical and electromechanical devices often require maintaining a specific temperature, or a narrow range or temperatures, during operation. An assembly regulates the temperature of a device by providing a variable thermal resistance between the device and a heatsink. The device can be mounted to a base having a high thermal resistance, the base thermally isolating the device from the heatsink. At low environmental temperatures, the base enables the device to rise to its operating temperature as a result of the device's waste heat, and with no or minimal use of a heater. As the environmental temperature increases, a working fluid, having a low thermal resistance, undergoes thermal expansion to fill a portion of a volume in the base between the device and the heat sink, lowering the thermal resistance between the device and the heatsink to maintain the device at the required operating temperature.