Cooling Manifold Bypass Pressure Control for Two-Phase Flow
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Solution Overview
Problem
Conventional cooling systems for data centers and electronic devices are inefficient and costly, particularly in handling high heat fluxes from next-generation microprocessors, due to limitations in air cooling and liquid cooling technologies, which face challenges with thermal resistance, risk of water leaks, and energy consumption.
Innovation Solution
A cooling apparatus utilizing a primary cooling loop with a dielectric coolant that transitions to two-phase bubbly flow within heat sink modules, incorporating bypasses with pressure regulators to manage coolant flow and maintain stable operation, allowing for efficient heat transfer and reduced energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional air cooling systems are used to cool high heat flux devices, then the system structure is simple, but the cooling efficiency is insufficient and energy consumption is high
Solution Approach 1:
The patent employs two-phase flow (liquid-vapor transition) of coolant to dramatically increase heat transfer efficiency. The coolant absorbs latent heat during phase change, enabling much higher heat flux removal compared to single-phase air cooling, thereby improving cooling efficiency while reducing energy consumption of auxiliary systems
Solution Approach 2:
The patent transitions from air cooling (gas) to liquid coolant systems, utilizing hydraulic principles for more efficient heat transfer. The liquid coolant provides superior volumetric heat capacity and thermal conductivity compared to air, enabling effective cooling of high heat flux devices with lower energy input
2Productivity
If liquid cooling systems are used to improve cooling efficiency, then cooling performance increases, but the risk of water damage and system complexity increases
Solution Approach 1:
The patent uses dielectric coolants with specific thermal and electrical properties that prevent water damage while maintaining high cooling efficiency. By changing the chemical composition and physical parameters of the coolant (using non-conductive fluids), the system achieves both improved cooling performance and enhanced reliability against electrical damage
Solution Approach 2:
The dielectric coolant acts as an intermediary substance that provides efficient heat transfer while eliminating the harmful effects of conventional water-based coolants. The intermediary fluid transfers heat effectively but does not conduct electricity, thereby preventing water damage to electronic components
3Temperature
If high flow rates are used in air cooling systems to cool high heat flux devices, then adequate cooling is achieved, but the system becomes noisy and energy-consuming
Solution Approach 1:
The patent replaces high-velocity air flow with liquid coolant flow, utilizing the superior heat capacity of liquids to achieve effective cooling at much lower flow velocities. This eliminates the noise and high energy consumption associated with high-speed fans while maintaining adequate cooling of heat-generating components
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 solution enables effective cooling of high heat flux devices with reduced energy consumption and lower operational costs, while minimizing the risk of water damage and maintaining system stability, thus addressing the inefficiencies of existing cooling systems.
Implementation Method 1
a flow of single-phase liquid coolant... which may become a two-phase bubbly flow within an outlet chamber of the first heat sink module due to heat being transferred from a first surface to be cooled to the flow
Implementation Method 2
heat being transferred from a first surface to be cooled to the flow
Implementation Method 3
incorporating bypasses with pressure regulators to manage coolant flow and maintain stable operation
Data Source
AI summary
A method of operating a cooling apparatus is described that allows flexible cooling lines connecting an inlet manifold to an outlet manifold to be safely added or removed during operation of the cooling apparatus without causing unstable two-phase flow. The method can include providing a cooling apparatus having an inlet manifold, an outlet manifold, and a bypass extending from the inlet manifold to the outlet manifold. Each manifold can include a plurality of connection ports, such as quick-connect couplers, to accommodate adding and removing cooling lines between the inlet manifold and the outlet manifold. The method can include providing a flow rate of single-phase liquid coolant to the inlet manifold and setting a pressure regulator in the bypass to provide a certain flow rate through the bypass. The flow rate through the bypass can be determined as a function of an average flow rate through each of the cooling lines.