Heat Pipe Temperature Control to Prevent Two-Phase Dry Out
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Solution Overview
Problem
Two-phase cooling devices used in electronic components can enter a 'dry out' state due to excessive evaporation rate exceeding fluid return rate, leading to increased thermal resistance and higher junction temperatures, which degrades performance and requires larger devices to prevent, increasing cost and thickness.
Innovation Solution
Implementing a thermal management approach that monitors temperature metrics to detect the onset of dry out, using a temperature modulation mechanism such as a cooling fan to increase the operating temperature of the heat pipe or vapor chamber, reducing fan speed or power input to improve fluid capillary flow and return rate, thereby restoring cooling capacity and minimizing performance degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the size of two-phase cooling devices is increased to avoid dry out state, then thermal performance is improved, but cost and thickness increase
Solution Approach 1:
The patent applies dynamics by making the cooling fan speed variable rather than fixed. The system dynamically adjusts fan speed based on real-time temperature monitoring to prevent dry out state. This allows the use of a smaller, thinner cooling device while maintaining thermal performance through active control, resolving the contradiction between device size/thickness and thermal reliability.
Solution Approach 2:
The patent implements feedback control by monitoring temperature metrics and using this information to adjust fan speed. The system continuously measures temperature, compares it against thresholds, and modifies cooling output accordingly. This feedback mechanism enables smaller cooling devices to maintain optimal performance by preventing dry out through intelligent control rather than relying on oversized passive cooling capacity.
2Productivity
If fan speed is reduced to improve fluid capillary flow, then cooling capacity is restored, but temperature increases
Solution Approach 1:
The patent applies parameter changes by deliberately increasing the operating temperature of the heat pipe to optimize fluid properties. By raising the temperature, the fluid viscosity decreases, which improves capillary flow and enhances the two-phase cooling mechanism. This parameter change resolves the contradiction by accepting higher operating temperature as a means to achieve better cooling capacity through improved fluid dynamics.
Solution Approach 2:
The patent leverages phase transitions of the cooling fluid to resolve the contradiction. By controlling temperature to optimize the liquid-vapor phase change cycle, the system improves capillary flow characteristics. The temperature increase facilitates better phase transition behavior, which in turn enhances cooling capacity despite the higher operating temperature, as the improved phase change efficiency compensates for the temperature rise.
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 approach effectively prevents or mitigates the dry out state, maintaining adequate cooling and improving processor performance by reducing thermal resistance and increasing maximum frequency and workload benchmark scores.
Implementation Method 1
these devices rely on this phase change of a fluid
Implementation Method 2
use the phase change from liquid to vapor to remove heat from the heat source
Implementation Method 3
a condensation side where vapor is converted back to liquid
Implementation Method 4
rely on the capillary limit of the internal structures (e.g., liquid tubes)
Data Source
AI summary
Cooling provided by a thermal management system may be controlled actively to reduce or prevent entering a dry out state. The systems and methods described herein include monitoring temperature metrics and identifying or predicting the onset of a dry out state, and temperature modulation mechanism may be controlled to cause an increase in the temperature of the heat pipe or vapor chamber. By controlling a temperature modulation mechanism to increase the operating temperature, the viscosity of the liquid in the thermal management approach is decreased, which improves its capillary flow and return rate back to the evaporator. By leveraging this temperature-dependent behavior, this thermal control approach may restore cooling capacity by managing the thermal management approach temperature due to a dry out state, and reduce or minimize the computing device performance degradation associated with a dry out state.