Intelligent Issue 05 | Page 15



Executive Summary
Increased heat densities of IT Equipment ( ITE ) in high performance data centers continues to drive the need for more efficient and effective cooling technologies . Traditional air cooling is not a sustainable solution in these settings . While liquid cooling offers far greater efficiencies than air cooling , many liquid cooling options require large capital expenditures , are difficult to integrate with existing infrastructure , and present complications when upgrades or added capacity are needed .
This paper presents a rack level Hybrid Liquid Cooling System ( HLCS ) that couples directcontact liquid cooling with a rear door cooler air-to-water heat exchanger .
The rack-level Hybrid Liquid Cooling System presents a unique entry point to achieving much higher efficiencies of liquid cooling as well as built-in components that provide flexibility and scalability for attaining additional efficiencies long term .
Content streaming , online banking , cloud computing , sophisticated smart phone apps , eCommerce . These are just a few examples of applications that are fueling data processing and traffic demand in data centers throughout the world . Emerging technologies , such as Artificial Intelligence ( AI ), telemedicine , machine learning , autonomous ( driverless ) vehicles and other real time modeling applications will accelerate demand further . The International Data Corp . ( IDC ) predicts that by 2025 we will generate 175 Zettabytes of data annually .
Forecasts suggest that the total electricity demand of information and communications technology will accelerate exponentially in the 2020s , and data centers will continue to grow in their share of power consumption ( Nature , 13 Sept . 2018 Vol 561 ).
Inside the data center , High Performance Computing servers are energy intensive and densely configured , producing more heat in smaller spaces . �


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