Two-Phase Cooling Apparatus for PCB Thermal Management
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Solution Overview
Problem
As information handling systems increase in performance and power usage, effective cooling methods are needed to manage heat generated by computing components, particularly in systems where traditional cooling methods may not suffice.
Innovation Solution
A two-phase cooling apparatus is introduced, which includes a container holding dielectric fluid surrounding a printed circuit board (PCB), a pump capturing vaporized dielectric fluid, and a diffuser reintroducing the vapor into the fluid to enhance heat removal through vaporization and condensation, along with diverter fins and a filter to optimize thermal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional cooling methods are used, then the system structure remains simple, but the cooling effectiveness is insufficient for high-performance systems
Solution Approach 1:
The patent employs two-phase cooling by utilizing the phase transition of dielectric fluid between liquid and vapor states. The fluid absorbs heat through vaporization at the PCB surface and releases heat through condensation in the condenser, providing highly effective cooling for high-performance computing components that generates excessive heat.
Solution Approach 2:
The patent introduces a dielectric fluid as an intermediary substance between the heat-generating PCB and the cooling system. This fluid mediates heat transfer by absorbing heat from the PCB during vaporization and releasing it during condensation, enabling effective thermal management while maintaining electrical insulation.
2Temperature
If dielectric fluid vaporization is used for cooling, then heat removal efficiency improves, but vapor accumulation may occur
Solution Approach 1:
The patent implements a feedback mechanism where a pump monitors and removes excess vapor from the sealed enclosure, preventing vapor accumulation. The pump activates when vapor pressure increases, maintaining a balanced vapor-fluid boundary and ensuring reliable continuous operation of the two-phase cooling system.
Solution Approach 2:
The pump removes (discards) accumulated vapor from the enclosure to prevent harmful effects, while the condenser recovers the vapor by condensing it back into liquid form, which then returns to the cooling cycle, creating a sustainable closed-loop system.
3Temperature
If vapor is reintroduced into the fluid, then thermal performance is enhanced, but system complexity increases
Solution Approach 1:
The patent merges multiple functions into integrated components: the pump serves both to remove excess vapor and to reintroduce condensed vapor to enhance cooling; the diffuser combines vapor injection with fluid circulation; and the diverter fins integrate flow guidance with thermal management, reducing the need for separate dedicated components.
Solution Approach 2:
The sealed enclosure serves multiple functions simultaneously: it contains the dielectric fluid, provides electrical insulation, maintains the vapor-fluid boundary, and facilitates heat exchange. This multi-functionality reduces the need for additional separate components while enhancing thermal performance.
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 effectively decreases the temperature of computing components by utilizing the vaporization and condensation of dielectric fluid, improving thermal performance and preventing thermal issues in high-performance information handling systems.
Implementation Method 1
the dielectric fluid decreasing a temperature of the PCB by removing heat from the PCB in the form of vaporization
Implementation Method 2
a pump positioned within the container, the pump capturing a portion of vapor of the dielectric fluid, at the vapor-fluid boundary, that results from the vaporization of the dielectric fluid
Implementation Method 3
a diffuser positioned within the container and coupled to the pump to introduce the captured vapor into the dielectric fluid
Data Source
AI summary
A two-phase cooling apparatus for an information handling system, including a container holding dielectric fluid, the dielectric fluid having a vapor-fluid boundary within the container, the container further containing a printed circuit board (PCB) including computing components, with the dielectric fluid surrounding the PCB and the computing components, the dielectric fluid decreasing a temperature of the PCB by removing heat from the PCB in the form of vaporization; a pump positioned within the container, the pump capturing a portion of vapor of the dielectric fluid, at the vapor-fluid boundary, that results from the vaporization of the dielectric fluid; and a diffuser positioned within the container and coupled to the pump to introduce the captured vapor into the dielectric fluid.