Pump Speed Sensor Leak Detection in Liquid-Cooled Systems

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Solution Overview

Problem

Liquid-cooled information handling systems face challenges in detecting leaks and coolant depletion, which can lead to reduced thermal control and component damage, as existing methods often fail to differentiate between leaks and evaporation.

Innovation Solution

Incorporating a pump speed sensor to generate a signal indicative of the pump's speed, with a processing device that determines if the speed exceeds a threshold, triggering remedial actions such as alerts or shutdowns to address potential leaks and coolant depletion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If liquid cooling systems are used to cool information handling components, then thermal control effectiveness is improved, but the risk of leaks and coolant depletion increases

Engineering Contradiction:

Improvethermal control effectivenessVSAvoidrisk of leaks and coolant depletion

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The pump speed sensor monitors coolant flow conditions continuously before critical depletion occurs. By detecting changes in pump speed that indicate low coolant levels or leaks, the system can trigger remedial actions (alerts, shutdowns) in advance, preventing thermal damage to components.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements a feedback loop where the pump speed sensor continuously monitors pump performance and reports to the management controller. The controller analyzes this feedback and automatically responds by triggering remedial actions when anomalies indicate leaks or depletion, creating a closed-loop monitoring system that maintains reliability.

Inventive Principle:

Principle #23Feedback

2Difficulty of detecting and measuring

If existing leak detection methods are used (detecting presence of leaked coolant), then leak detection capability is provided, but the ability to detect evaporation and differentiate between leaks and evaporation is lost

Engineering Contradiction:

Improveleak detection capabilityVSAvoidability to differentiate leaks from evaporation

Core Design Contradiction:

Difficulty of detecting and measuringVSMeasurement precision

Solution Approach 1:

The pump speed sensor serves as an intermediary measurement device that indirectly detects coolant conditions. Instead of directly detecting leaked coolant (which cannot distinguish leak from evaporation), the sensor measures pump speed changes caused by both leaks and evaporation, providing a unified detection mechanism that preserves the ability to detect both conditions.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces chemical/biological detection methods (detecting presence of coolant substances) with a mechanical measurement approach (measuring pump speed). This substitution enables detection of both leaks and evaporation through a single sensor type, overcoming the limitation of existing methods that can only detect actual coolant presence.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Measurement precision

If pump speed monitoring is implemented to detect coolant depletion, then detection accuracy for both leaks and evaporation is improved, but device complexity increases

Engineering Contradiction:

Improvedetection accuracy for leaks and evaporationVSAvoiddevice complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The pump speed sensor performs multiple functions: it monitors pump operation, detects coolant leaks, detects coolant evaporation, and provides data for thermal management. By making this single sensor multi-functional, the system achieves high detection accuracy without adding multiple specialized sensors, thereby limiting the increase in device complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The existing pump's speed characteristics serve as the detection mechanism itself. The pump's operational parameters (speed changes under load) provide self-diagnostic information about coolant conditions, eliminating the need for separate, complex detection systems and reducing overall device complexity while maintaining high measurement precision.

Inventive Principle:

Principle #25Self-service

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 reduces the risk of thermal control failure by accurately detecting pump speed changes associated with coolant depletion, enabling timely intervention to prevent damage and maintain system performance.

Implementation Method 1

a pump speed sensor operable to generate a pump speed signal indicative of a speed of the pump

Methodology Applied

Scientific EffectPump speed variation due to fluid depletion:

Data Source

PatentUS20240381586A1Systems and methods for leak and evaporation detection in liquid-cooled information handling systems

Publication Date: 2024.11.14 DELL PROD LP

AI summary

An information handling system may include an information handling resource and a liquid cooling system for providing cooling of the information handling resource. The liquid cooling system may include a pump configured to drive flow of a liquid coolant through the liquid cooling system, a pump speed sensor configured to generate a pump speed signal indicative of a speed associated with the pump, and a processing device configured to receive the pump speed signal, determine whether the speed exceeds a threshold pump speed, and if the speed exceeds the threshold pump speed, take one or more remedial actions.