Hybrid Static Dynamic Ambient Temperature Control for Server Sleds

Solution Overview

Problem

Existing information handling systems face challenges in dynamically adjusting the maximum supported ambient temperature based on varying airflow conditions, leading to potential overheating issues.

Innovation Solution

The system employs a hybrid approach by combining statically defined maximum ambient temperatures based on worst-case sled impedances with dynamically calculated temperatures based on available airflow, using a machine learning system to determine airflow equations for each sled.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If statically defined maximum ambient temperature based on worst-case sled impedances is used, then reliability is improved by preventing overheating, but adaptability deteriorates because the system cannot adjust to varying airflow conditions

Engineering Contradiction:

Improveoverheating preventionVSAvoidadjustment to varying airflow conditions

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent implements a hybrid approach where the maximum ambient temperature is determined by combining a static baseline value (from thermal characteristics table) with a dynamic component (calculated from measured airflow). This allows the temperature limit to adapt in real-time to actual cooling conditions while maintaining a safe baseline, resolving the contradiction between reliability and adaptability.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the parameter of maximum ambient temperature from a fixed static value to a dynamically adjusted value based on airflow measurements. By calculating a temperature adjustment factor from airflow data and applying it to the static baseline, the system optimizes thermal management for current operating conditions while preventing overheating.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If dynamically calculated maximum ambient temperature based on available airflow is used, then adaptability is improved, but reliability deteriorates due to potential calculation errors or insufficient airflow data

Engineering Contradiction:

Improveadjustment to varying airflow conditionsVSAvoidoverheating prevention

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent implements a hybrid approach where the maximum ambient temperature is determined by combining a static baseline value (from thermal characteristics table) with a dynamic component (calculated from measured airflow). This allows the temperature limit to adapt in real-time to actual cooling conditions while maintaining a safe baseline, resolving the contradiction between reliability and adaptability.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system uses a static baseline maximum ambient temperature from the thermal characteristics table as a safety cushion or fallback. This pre-defined conservative value ensures that even if dynamic calculations are inaccurate or airflow data is insufficient, the system will not exceed safe temperature limits, thus maintaining reliability.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Adaptability or versatility

If a hybrid approach combining static and dynamic temperature definitions is used, then adaptability is improved while maintaining reliability, but device complexity increases

Engineering Contradiction:

Improveadjustment to varying airflow conditionsVSAvoidtemperature determination mechanism

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent implements a hybrid approach where the maximum ambient temperature is determined by combining a static baseline value (from thermal characteristics table) with a dynamic component (calculated from measured airflow). This allows the temperature limit to adapt in real-time to actual cooling conditions while maintaining a safe baseline, resolving the contradiction between reliability and adaptability.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20250044843A1Hybrid of statically and dynamically defined maximum supported ambient temperature in an information handling system

Publication Date: 2025.02.06 DELL PROD LP

AI summary

An information handling system has a chassis having an embedded controller (EC) and a plurality of sleds, each having a BMC. Each BMC 1) determines a configuration of the sled, 2) matches the configuration to an entry of sled thermal characteristics table in the EC, 3) determines whether a maximum ambient temperature field has a first maximum ambient temperature value or an indication to calculate another maximum ambient temperature value, 4) when the maximum ambient temperature field has the first maximum ambient temperature value, ascribe the first maximum ambient temperature value to the operation of the sled, and, 5) when the maximum ambient temperature field has the indication, to a) receive an available airflow value from the EC, b) determine a second maximum ambient temperature value based upon the available airflow, and c) ascribe the second maximum ambient temperature value to the operation of the sled.