High-efficiency data center cooling
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Solution Overview
Problem
Traditional data centers face challenges in achieving energy efficiency due to increasing electricity consumption and unpredictable cooling demands, despite efforts to adopt more relaxed environmental standards, as existing methods do not fully maximize varying environmental conditions for energy savings.
Innovation Solution
A data center cooling system with multiple cooling loops, including a first chilled liquid loop with a higher temperature set point and a second loop for humidity control, utilizing a free cooling heat exchanger and flow control devices to optimize energy efficiency by activating chillers and heat exchangers based on environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional cooling systems are used to maintain low temperatures in data centers, then equipment reliability is improved, but energy consumption increases
Solution Approach 1:
The cooling system is divided into two independent loops: a first chilled liquid loop for IT equipment cooling and a second loop for humidity control. This segmentation allows each loop to be optimized independently, enabling the first loop to operate at higher temperatures for energy efficiency while the second loop handles dehumidification, thereby reducing overall energy consumption while maintaining equipment reliability
Solution Approach 2:
The system raises the chilled liquid temperature set point in the first loop from traditional low temperatures to higher temperatures (e.g., 55-65°F), which significantly reduces energy consumption. This parameter change is made possible by the decoupled two-loop architecture that isolates humidity control from temperature control, preventing the traditional trade-off between reliability and energy use
2Use of energy by moving object
If free cooling is used when outside environmental conditions are favorable, then energy savings are achieved, but free cooling hours are limited
Solution Approach 1:
By separating humidity control into an independent second loop, the system can utilize free cooling in the first loop for extended periods without compromising dehumidification performance. This allows free cooling to operate whenever outdoor conditions permit, dramatically extending the duration of free cooling hours while maintaining energy savings
Solution Approach 2:
The second loop acts as an intermediary that handles humidity control independently, allowing the first loop to maximize free cooling utilization. The flow control device mediates between the two loops, enabling the first loop to operate in free cooling mode for extended periods while the second loop ensures humidity requirements are met
3Use of energy by moving object
If multiple cooling loops are implemented with isolated humidity control, then energy efficiency is improved, but device complexity increases
Solution Approach 1:
The first chilled liquid loop serves multiple functions: it cools IT equipment and can be used for free cooling when conditions permit. The second loop handles humidity control. This multi-functionality of the first loop, combined with the specialized second loop, achieves high energy efficiency while managing complexity through clear functional separation
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 allows for greater control over cooling demands, maximizing energy savings during both normal and free cooling operations, and extends free cooling hours by up to 50% by isolating humidity control components and using a heat exchanger in conjunction with chillers to maintain set points effectively.
Implementation Method 1
A free cooling heat exchanger is coupled to the first liquid loop for use when a wet-bulb temperature surrounding the data center is capable of producing a condenser water that is at a differential temperature below a return temperature of the first chilled liquid loop
Data Source
AI summary
High-efficiency cooling is performed in a data center in response to a cooling and/or humidity demand using a system having multiple cooling loops. The system includes a plurality of integrated cooling systems each comprising one or more specifically sized chillers and a liquid loop to address the cooling demand. A free cooling heat exchanger is coupled to the first liquid loop for use when a wet-bulb temperature surrounding the data center is at or below a free cooling set point of the first chilled liquid loop. The system isolates humidity control components to a second chilled liquid loop, and enables greater control of the first chilled liquid loop of the data center to meet specific IT loads.