Two-Phase R2A Heat Exchanger for High-Density Datacenter Cooling

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Solution Overview

Problem

Existing datacenter cooling systems face challenges in efficiently managing varying heat requirements due to changing computing loads, particularly with high heat density components like GPUs, CPUs, and switches, often requiring innovative methods beyond traditional air-cooling systems.

Innovation Solution

An intelligent two-phase refrigerant-to-air (R2A) heat exchanger system is introduced, utilizing a two-phase refrigerant or engineered fluid with a cold plate and in-datacenter compressor/condensing unit to absorb and dissipate heat directly from computing devices, capable of operating independently or supplementing a secondary cooling loop.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If traditional air-cooling systems are used, then system simplicity is maintained, but cooling capacity is insufficient for high heat density components

Engineering Contradiction:

Improvecooling capacityVSAvoidsystem complexity

Core Design Contradiction:

PowerVSDevice complexity

Solution Approach 1:

The patent employs two-phase refrigerant flow through cold plates attached to high heat density components. The refrigerant undergoes phase change from liquid to vapor, absorbing latent heat efficiently, then returns to the condensing unit where it condenses back to liquid, releasing heat. This phase transition mechanism enables high cooling capacity for GPUs, CPUs, and switches while maintaining a relatively simple system architecture.

Inventive Principle:

Principle #36Phase transitions

2Ease of operation

If external condensing units are used, then cooling function is provided, but external access is required and system footprint increases

Engineering Contradiction:

Improveindependence from external accessVSAvoidcooling capacity

Core Design Contradiction:

Ease of operationVSPower

Solution Approach 1:

The patent integrates the condensing unit directly within the datacenter rack, merging the previously external condensing function with the cooling system. This integration eliminates the need for external access and reduces system footprint while maintaining full cooling capacity through the two-phase refrigerant cycle.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The system transitions from horizontal/external cooling architecture to vertical/integrated rack-mounted architecture. The condensing unit is positioned within the same vertical space as the computing components it serves, changing the spatial dimension of the cooling system from external to internal rack integration.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Temperature

If cooling systems are designed for maximum heat density, then high heat density components are cooled effectively, but adaptability to varying computing loads is reduced

Engineering Contradiction:

Improvecooling effectivenessVSAvoidadaptability to varying loads

Core Design Contradiction:

TemperatureVSAdaptability or versatility

Solution Approach 1:

The two-phase refrigerant system dynamically adapts to varying computing loads through its phase change mechanism. The refrigerant flow rate and phase transition points automatically adjust based on the thermal load from GPUs, CPUs, and switches, providing optimal cooling effectiveness across a range of operating conditions without requiring manual intervention or complex control systems.

Inventive Principle:

Principle #15Dynamics

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 R2A heat exchanger effectively addresses high cooling demands by transforming refrigerant phases to efficiently remove heat from high heat density components, reducing the need for external condensing units and enhancing cooling capacity without external access.

Implementation Method 1

utilizing a two-phase refrigerant or engineered fluid with a cold plate and in-datacenter compressor/condensing unit to absorb and dissipate heat directly from computing devices

Methodology Applied

Scientific EffectPhase change: Phase Change

Implementation Method 2

transforming refrigerant phases to efficiently remove heat from high heat density components

Methodology Applied

Scientific EffectHeat absorption: Latent Heat

Implementation Method 3

refrigerant-to-air (R2A) heat exchanger effectively addresses high cooling demands by transforming refrigerant phases to efficiently remove heat

Methodology Applied

Scientific EffectHeat exchange: Heat Exchanger

Implementation Method 4

dissipate heat directly from computing devices

Methodology Applied

Scientific EffectConvection: Convection

Implementation Method 5

in-datacenter compressor/condensing unit to absorb and dissipate heat

Methodology Applied

Scientific EffectCompression: Compression

Implementation Method 6

in-datacenter compressor/condensing unit to absorb and dissipate heat

Methodology Applied

Scientific EffectCondensation: Condensation

Data Source

PatentUS12477701B2Intelligent two-phase refrigerant-to-air heat exchanger for datacenter cooling systems

Publication Date: 2025.11.18 NVIDIA CORP

AI summary

Systems and methods for cooling a datacenter are disclosed. In at least one embodiment, a refrigerant-to-air (R2A) heat exchanger is interfaced with at least one cold plate to absorb heat from at least one computing device using a two-phase fluid and is interfaced with a compressor or condensing unit that causes dissipation of at least part of the heat within a datacenter.