Datacenter Liquid Cooling Maintenance Using Valve and Fan Purge Cycles

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Solution Overview

Problem

Maintenance of liquid-cooled datacenter cooling systems is complex and inefficient, requiring manual intervention to unclog and clean tubes, fans, and heat exchangers, which can disrupt continuous cooling operations.

Innovation Solution

A smart control valve system that adjusts cooling fluid flow rates and fan speeds based on temperature and pressure differentials, with a method that includes opening the valve fully open for maintenance and running fans at maximum speed for a predetermined time, along with dynamic adjustments to maintain optimal differential temperatures and airflow.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of repair

If manual intervention is used to unclog and clean tubes, fans, and heat exchangers, then maintenance can be performed, but operational disruption occurs and maintenance complexity increases

Engineering Contradiction:

Improvemaintenance accessibilityVSAvoidcontinuous cooling operation

Core Design Contradiction:

Ease of repairVSReliability

Solution Approach 1:

The system performs preliminary cleaning actions automatically during normal operation by injecting cleaning agents through the existing liquid cooling circuit. The smart control valve opens briefly to allow cleaning agent injection without requiring manual intervention, thus maintaining continuous operation while performing maintenance functions.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The cooling system performs self-maintenance through automated cleaning cycles controlled by the smart valve system. The system injects cleaning agents, circulates them through the circuit, and drains them automatically, enabling the system to service itself without external intervention and without disrupting continuous cooling operations.

Inventive Principle:

Principle #25Self-service

2Ease of repair

If the smart control valve opens fully for maintenance cleaning, then cleaning effectiveness improves, but cooling performance temporarily deteriorates

Engineering Contradiction:

Improvecleaning effectivenessVSAvoidcooling performance

Core Design Contradiction:

Ease of repairVSTemperature

Solution Approach 1:

The smart control valve implements periodic action by opening fully only during scheduled maintenance intervals to inject cleaning agents, then returning to its normal modulating position to maintain optimal cooling performance. This periodic full-opening action allows effective cleaning while minimizing impact on continuous cooling operations.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The system performs preliminary cooling of the cleaning agent before injection by circulating it through the liquid cooling circuit. This ensures the cleaning agent is at the correct temperature to prevent thermal shock to electronic components while maintaining effective cleaning capability.

Inventive Principle:

Principle #10Preliminary action

3Ease of repair

If fans run at maximum speed for maintenance, then airflow cleaning effectiveness improves, but energy consumption increases

Engineering Contradiction:

Improveairflow cleaning effectivenessVSAvoidfan energy consumption

Core Design Contradiction:

Ease of repairVSUse of energy by moving object

Solution Approach 1:

The fans implement periodic action by running at maximum speed only during scheduled maintenance intervals to maximize airflow and cleaning effectiveness, then returning to their normal speed settings to minimize energy consumption during regular operation. This temporal separation allows effective cleaning while maintaining energy efficiency.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The maintenance cycle rushes through the high-energy fan operation phase as quickly as possible, maximizing cleaning effectiveness in a brief period, then immediately transitions to normal low-energy operation. This minimizes the time spent in high energy consumption state while achieving effective maintenance.

Inventive Principle:

Principle #21Skipping (Rushing through)

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

Enhances the reliability and efficiency of datacenter cooling systems by optimizing fluid flow and airflow, reducing maintenance complexity and ensuring continuous cooling operations.

Implementation Method 1

at least one liquid cooling block arranged to be in respective thermal contact with the at least one heat-generating electronic processing element

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

a dry cooling unit configured to supply a cooling liquid to the rack-mounted processing assemblies and receive a heated liquid from the rack-mounted processing assemblies

Methodology Applied

Scientific EffectHeat exchange: Heat Exchanger

Implementation Method 3

at least one fan to cool an air-flow in the rack

Methodology Applied

Scientific EffectForced convection: Forced Convection

Data Source

PatentUS20260040488A1Maintenance of datacenter fluid cooling arrangement

Publication Date: 2026.02.05 OVH

AI summary

A maintenance method for a liquid cooling system comprising a rack-mounted processing assemblies, comprising a set of steps: a step of opening a smart control valve in a fully open state during a pre-determined time, and/or a step of running at least one fan of the liquid cooling system at a maximal speed during a pre-determined time.