Server Rack Fan Speed Control for Heat Dissipation

Resolve Bottlenecks,
Find Innovative Solutions
Generate Solutions

Solution Overview

Problem

Servers face unexpected shutdowns due to inadequate heat dissipation, leading to potential severe consequences in commercial and financial applications, as existing cooling mechanisms fail to maintain operating temperatures within preset thresholds.

Innovation Solution

A server system with two side-by-side server rack modules and a controller, where fans are arranged to create an airflow path from an air inlet to an air outlet side, and the controller increases the rotational speed of fans closest to the air outlet if any fan fails to enhance heat dissipation efficiency, and also adjusts the cooling fluid flow rate and temperature in cooling components to maintain optimal temperatures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If the heat dissipation device operates at normal fan speed, then energy consumption is low and noise is reduced, but heat dissipation efficiency is insufficient causing operating temperature to exceed threshold

Engineering Contradiction:
Improveoperating temperatureVSAvoidenergy consumption
Core Design Contradiction:
TemperatureVSLoss of energy

Solution Approach 1:

The patent implements dynamic fan speed adjustment by controlling fans to rotate at different speeds based on real-time temperature monitoring. The controller increases fan rotation speed when temperature approaches the threshold and reduces speed when temperature is safe, optimizing the balance between heat dissipation efficiency and energy consumption.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The system changes the operational parameters of the heat dissipation device by adjusting fan rotation speed as a variable parameter. This allows the heat dissipation capacity to be dynamically modified according to thermal conditions, achieving efficient heat removal only when necessary and reducing energy waste during normal operation.

Inventive Principle:
Principle #35Parameter changes

2Temperature

If fan rotation speed is increased to improve heat dissipation, then operating temperature is controlled within threshold, but energy consumption increases and noise level rises

Engineering Contradiction:
Improveoperating temperatureVSAvoidnoise
Core Design Contradiction:
TemperatureVSObject-affected harmful factors

Solution Approach 1:

The system dynamically adjusts fan speed based on temperature conditions, operating at high speed only when thermal thresholds are approached and at low or idle speed during normal operation. This dynamic control minimizes noise exposure while maintaining effective heat dissipation when required.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The controller periodically monitors temperature and adjusts fan speed in response to thermal conditions, creating a responsive control cycle that activates high-speed operation only during periods when heat dissipation is actually needed, rather than maintaining constant high-speed operation.

Inventive Principle:
Principle #19Periodic action

3Temperature

If multiple fans are used in the heat dissipation device, then heat dissipation efficiency is improved, but device complexity increases

Engineering Contradiction:
Improveheat dissipation efficiencyVSAvoiddevice complexity
Core Design Contradiction:
TemperatureVSDevice complexity

Solution Approach 1:

The heat dissipation device is segmented into multiple independent fan units, each capable of being controlled individually. This segmentation allows the system to achieve better heat dissipation through multiple airflow paths while managing complexity by treating each fan as a separate controllable element with shared control logic.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

Multiple fans serve universal heat dissipation functions across different regions of the server rack. The control system applies universal control algorithms to all fans, managing complexity through standardized control logic that can be applied to any number of fan units without requiring separate control systems for each.

Inventive Principle:
Principle #6Universality (Multi-functionality)

4Reliability

If the server system uses a protection mechanism with automatic shutdown, then electronic elements are protected from failure, but severe consequences occur in commercial and financial applications

Engineering Contradiction:
Improveprotection against failureVSAvoidcontinuous operation
Core Design Contradiction:
ReliabilityVSProductivity

Solution Approach 1:

The system implements continuous temperature monitoring with feedback control that adjusts fan speed in response to thermal conditions. This active feedback mechanism prevents temperature thresholds from being exceeded in the first place, eliminating the need for protective shutdown and ensuring continuous operation while maintaining component protection.

Inventive Principle:
Principle #23Feedback

Solution Approach 2:

The control system takes preliminary action by proactively managing heat dissipation through dynamic fan control before temperature thresholds are reached. This preventive approach addresses thermal issues in advance, preventing the conditions that would trigger protective shutdown mechanisms and ensuring uninterrupted server operation.

Inventive Principle:
Principle #10Preliminary action

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 effectively improves heat dissipation efficiency by compensating for failed fans and maintaining safe operating temperatures, preventing server shutdowns and ensuring continuous operation.

Implementation Method 1

When the two fan components are in operation, an air flow is formed in the two cabinets arranged side by side, and the air flow flows from the air inlet side toward the air outlet side of the server system

Methodology Applied
Scientific EffectAir flow: Convection

Implementation Method 2

the controller increases a rotational speed of the fan component close to the air outlet side, thereby improving the heat dissipation efficiency of the server system

Methodology Applied
Scientific EffectHeat dissipation: Convection

Data Source

PatentUS9007765B2Server system and method for controlling the same
Publication Date: 2015.04.14 INVENTEC PUDONG TECH CORPOARTION
  • US9007765B2 patent drawing
  • US9007765B2 patent drawing
  • US9007765B2 patent drawing

AI summary

A server system has an air inlet side and an air outlet side. The server system includes two server rack modules arranged side by side and a controller electrically connected to the server rack modules. Each server rack module includes a cabinet having a first side close to the air inlet side, multiple server hosts detachably disposed in the cabinet and a fan component. The fan component, disposed at the first side, includes multiple fans electrically connected to the controller. The first side of one of the cabinets abuts against the second side of the other cabinet. When the fan components operate, an air flow is formed in the cabinets. The server hosts are located in the flow path of the air flow. When one of the fans is failed, the controller is adapted for increasing a rotational speed of the fan component close to the air outlet side.