Data Center Air Circulation Control for Energy-Efficient Cooling
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Solution Overview
Problem
Data centers face inefficiencies in energy consumption due to low server activity, which reduces the temperature gradient between hot and cold aisles, leading to reduced efficiency of computer room air conditioning (CRAC) units and increased operational costs and risk of blackouts.
Innovation Solution
A data center system with adjustable perforated floor and ceiling elements that can be toggled by a controller to bypass the air conditioning unit during low activity, recirculating air within the hot aisle to maintain temperature thresholds and optimize energy efficiency, and integrated temperature sensors within server racks to manage server activity and cooling demands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the CRAC unit operates continuously to cool the data center, then server cooling is maintained, but energy consumption increases during low server activity when temperature gradient is small
Solution Approach 1:
The system dynamically adjusts the CRAC unit operation based on server activity levels and temperature gradients. During low server activity when temperature gradient is small, the CRAC unit is bypassed and hot aisle air is recirculated directly to cold aisles. During high server activity when temperature gradient is large, the CRAC unit activates to cool the hot aisle air before returning it to cold aisles, optimizing energy consumption across varying operational conditions
Solution Approach 2:
The system changes operational parameters (CRAC unit on/off state, air flow paths) based on detected temperature conditions. Temperature sensors monitor the temperature gradient between hot and cold aisles, and the controller adjusts the system configuration accordingly - switching between CRAC cooling mode and direct recirculation mode to match current thermal conditions and server activity levels
2Use of energy by moving object
If the CRAC unit operates at reduced air volumes during low server activity, then energy consumption is reduced, but cooling efficiency decreases
Solution Approach 1:
The system dynamically switches between two operational modes: during low server activity, it operates in recirculation mode where hot aisle air is directly returned to cold aisles without CRAC processing, maintaining cooling adequacy without CRAC energy consumption. During high server activity, it transitions to CRAC cooling mode where the unit processes hot aisle air, ensuring adequate cooling capacity when heat generation is high
Solution Approach 2:
The invention extracts the CRAC unit from the mandatory cooling path during low server activity conditions. By providing an alternative air recirculation path that bypasses the CRAC unit, the system eliminates the need for the CRAC unit to operate at reduced efficiency, completely avoiding its operation when temperature gradients are small and cooling demand is low
3Temperature
If baffles and doors are used to prevent warm air entrainment into cold aisles, then temperature gradient increases, but device complexity increases
Solution Approach 1:
The perforated floor elements serve multiple functions: they allow cold air supply to server racks, enable hot air recirculation back to cold aisles, and provide access for temperature sensors. The ceiling elements similarly serve both as structural components and as pathways for hot air extraction and recirculation, eliminating the need for separate baffle structures
Solution Approach 2:
The system uses the existing server rack infrastructure and perforated floor/ceiling elements to achieve air flow control. Temperature sensors mounted on server racks monitor local conditions and trigger recirculation mode when appropriate, allowing the system to self-regulate without complex external control structures
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 solution allows the data center to operate at improved energy efficiency by avoiding reduced CRAC unit efficiency during low server activity, reducing energy consumption, and ensuring optimal server cooling by activating the AC unit only when necessary, thus minimizing operational costs and preventing overheating.
Implementation Method 1
an air conditioning unit having an input coupled to the hot aisle via the ceiling element and an output coupled to the cold aisle via the first perforated floor element
Implementation Method 2
integrated temperature sensors within server racks to manage server activity and cooling demands
Implementation Method 3
recirculating air within the hot aisle to maintain temperature thresholds and optimize energy efficiency
Data Source
AI summary
A method of controlling air circulation in a data center system. The data center system includes: a cold aisle; a hot aisle including a floor element and a ceiling element; a server rack comprising a controller and servers separating the cold aisle from the hot aisle; and an air conditioning unit. The method includes: toggling, by the controller, the hot aisle between: (a) a first configuration in which the ceiling element is opened and the floor element is closed and (b) a second configuration in which the ceiling element is closed and the floor element is opened, wherein the first configuration enables circulation of air from the from the hot aisle to the cold aisle via the air conditioning unit, and wherein the second configuration enables circulation of air from the from the hot aisle to the cold aisle without the circulated air passing through the air conditioning unit.