Data Center CO2 Refrigeration Cooling to Eliminate Water Loops
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Solution Overview
Problem
Traditional data center cooling systems require water loops, make-up water, and evaporative towers, leading to high capital, operational, and maintenance costs, as well as limited flexibility and efficiency due to the use of heat exchangers and multiple pumps.
Innovation Solution
A cooling system that uses carbon dioxide as a working fluid, eliminating the need for water loops and evaporative towers by employing a compressor, air-cooled heat exchanger, and expansion device to circulate cooled air, reducing equipment complexity and improving thermal efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If traditional water-loop cooling systems with evaporative towers are used, then cooling capacity is sufficient for high heat loads, but capital and operational costs increase significantly
Solution Approach 1:
The patent extracts and eliminates the evaporative cooling tower and water-loop components from the traditional cooling system, replacing them with a closed-loop air-cooled system using CO2 as refrigerant. This removes the need for large water reservoirs, evaporative towers, and associated infrastructure while maintaining adequate cooling capacity through the CO2 refrigeration cycle.
Solution Approach 2:
The patent changes the working fluid from water to carbon dioxide (CO2), fundamentally altering the thermodynamic parameters of the cooling system. CO2 operates at different pressure and temperature characteristics, enabling a compact closed-loop system that eliminates the need for evaporative cooling towers and large water loops while maintaining effective heat rejection.
2Power
If multiple heat exchangers and pumps are used in traditional cooling systems, then cooling performance is achieved, but device complexity and maintenance requirements increase
Solution Approach 1:
The patent merges multiple separate cooling components into an integrated CO2 refrigeration system. The compressor, condenser, expansion device, and evaporator are combined into a unified closed-loop system that achieves the same cooling performance with fewer discrete components, reducing overall system complexity and maintenance requirements.
Solution Approach 2:
The patent replaces the mechanical water-pumping system with a refrigerant-compression system. Instead of using multiple pumps to circulate water through heat exchangers and evaporative towers, the system uses a CO2 compressor to circulate refrigerant through a simplified closed-loop cycle, reducing mechanical complexity while maintaining cooling effectiveness.
3Ease of operation
If traditional HVAC systems are used in data centers, then cooling is provided, but flexibility and adaptability are limited
Solution Approach 1:
The CO2 refrigeration system is designed to be universally applicable to various data center configurations and cooling requirements. The closed-loop system can be adapted to different heat loads, spatial arrangements, and operational conditions, providing flexible cooling solutions that can serve multiple functions and configurations unlike traditional HVAC systems.
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 reduces capital and operational costs, enhances flexibility, and improves thermal efficiency by eliminating heat exchangers and pumps, allowing for a simpler cooling arrangement similar to residential systems while effectively managing high heat loads in data centers.
Implementation Method 1
A compressor compresses a CO2 working fluid
Implementation Method 2
A air cooled heat exchanger is located downstream from the compressor and is located in the ambient atmosphere out-of-doors for cooling the working fluid
Implementation Method 3
An expansion device is located downstream from the heat exchanger
Implementation Method 4
A cooling device is located within the data center in which the working fluid is expanded for cooling air, either hot air discharged from the processors or outside ambient air, and for circulating such cooled air around the processors for cooling the processors
Data Source
AI summary
A system for cooling a plurality of processors in a data center is disclosed. The cooling system includes a refrigeration system having a compressor for compressing a carbon dioxide (CO2) working fluid, an air cooled heat exchanger downstream from the compressor and located out-of-doors for cooling the working fluid, an expansion device downstream from the heat exchanger, a cooling device located within the data center in which the working fluid is expanded to cool the processors by circulating the cooled air around the processors, and a return line for the return of the working fluid from the cooling device to the compressor.