External Air Damper Control for Data Center Free Cooling
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Solution Overview
Problem
Existing data center cooling systems face inefficiencies in heat removal due to non-uniform waste heat generation across different components, as uniform cooling methods may not effectively address varying heat output from high-density and low-density rack systems.
Innovation Solution
A cooling system with air channeling sub-systems that include outside and return air dampers, temperature sensors, and a controller to adjust airflow based on wet bulb temperature, allowing outside air intake when it drops below a predetermined level, and deactivating heat removal systems in free cooling mode to optimize cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If uniform cooling methods are applied to non-uniform waste heat generation sources, then system simplicity is maintained, but cooling efficiency deteriorates
Solution Approach 1:
The cooling system is divided into multiple independent air channeling subsystems, each equipped with its own outside air damper and return air damper. This segmentation allows each subsystem to independently control airflow based on local heat generation characteristics, resolving the contradiction between system simplicity and cooling efficiency by enabling targeted cooling without requiring a completely complex centralized control system.
Solution Approach 2:
The system dynamically adjusts damper positions based on real-time temperature feedback from sensors placed near high-density and low-density rack systems. The controller modulates outside air and return air dampers to vary cooling capacity according to actual heat loads, transforming the static uniform cooling approach into a dynamic adaptive system that maintains efficiency while avoiding excessive complexity.
2Use of energy by moving object
If outside air is used for free cooling, then energy consumption is reduced, but system control complexity increases
Solution Approach 1:
The system uses free cooling from outside air when environmental conditions permit, allowing the natural temperature difference between outside air and equipment to provide cooling without active refrigeration. This self-service approach reduces energy consumption by utilizing free available cooling capacity, while the automated damper control handles the complexity of switching between free cooling and active cooling modes.
Solution Approach 2:
Temperature sensors continuously monitor conditions near rack systems and provide feedback to the controller, which automatically adjusts outside air and return air damper positions. This feedback mechanism enables the system to seamlessly transition between free cooling mode (when outside air is sufficiently cold) and active cooling mode, reducing energy consumption while maintaining simple operation through automated control.
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 reduces installation and operational costs by eliminating expensive components and enhances cooling efficiency by dynamically adjusting airflow to match varying heat loads across different rack systems.
Implementation Method 1
at least one temperature sensor that measures a wet bulb temperature of outside air
Implementation Method 2
The mixing chamber may mix outside air with air returned from the electronic equipment
Implementation Method 3
at least one heat removal sub-system that removes heat from the cooling air in at least one of the air channeling sub-systems
Data Source
AI summary
A cooling system includes one or more air channeling sub-systems that provide cooling air to electronic equipment, at least one heat removal sub-system that removes heat from the cooling air in at least one of the air channeling sub-systems, at least one temperature sensor measures a wet bulb temperature of outside air, and at least one controller. At least one of the air channeling sub-systems includes an outside air damper operable allow outside air into the air channeling sub-system. The at least one controller at least partially opens the outside air damper if a wet bulb temperature measured at the at least one temperature sensor drops to or below a predetermined temperature.