The Increasing Cooling Problem
Demands on data centers have never been higher. These days, power densities usually exceed 30 kW per rack, and modern CPUs and GPUs have higher thermal design power (TDP), which makes the cooling load even worse.The affordability and ease of use of air cooling have made it popular, but as expenses and energy consumption increase, its drawbacks become more apparent. According to IDC, the demand for power in data centers will more than double globally between 2023 and 2082, and by 2071, AI-driven data center capacity will increase by 40.5%.
Although efficient air cooling takes up a lot of room in data centers with limited space, energy efficiency is becoming more and more crucial as power needs rise.
Is Air Cooling Able to Keep Up?
With Dell's improvements in airflow control and high-efficiency fans, air cooling is still a possibility for many common workloads with lower densities (less than 10–15 kW per rack). These developments push the boundaries of air-cooled environments while remaining affordable for moderate demands.However, when power densities rise, air cooling does offer a number of drawbacks, including increased cooling costs, performance risks from thermal throttling, and limited scalability. Furthermore, the frequency of cooling-related outages may rise, necessitating more repairs and raising the possibility of operational disruption.
If data centers expect to grow or are facing increasing cooling costs, these problems may suggest that they need to consider a more efficient cooling plan.
The Benefits of Cooling with Liquid
High-density data centers are increasingly using liquid cooling because of its superior thermal conductivity.According to a recent NREL study, liquid cooling can achieve a Power Usage Effectiveness (PUE) of 1.05 as opposed to 1.5–2.0 for air-cooled systems. Accordingly, compared to air cooling, liquid cooling can result in energy cost savings of up to 40%.
Liquid cooling not only saves energy but can also manage racks with densities higher than 20 kW, where air cooling starts to fail. Dell's Integrated Rack Scalable Systems (IRSS) can handle densities up to 264 kW, and they could be able to handle much higher densities.
Liquid cooling also frees up valuable data center real estate by enabling a higher computing density per rack. Additionally, because liquid cooling requires fewer fans, it operates more quietly. Closed-loop systems that recycle cooling water offer an extra benefit and help achieve sustainability goals by reducing waste and secondary cooling needs.
What Time Is Best for Transitioning?
The decision to switch to liquid cooling is often clear when certain indicators appear. Power density is a crucial factor; when densities surpass 15-20 kW per rack, air cooling struggles to regulate temperatures without appreciable advancements.A rising PUE may also be a sign of an inefficient air-cooling system, which is costly and challenging to maintain. Rising energy costs, especially as sustainability obligations rise, further raise the need for more efficient cooling. Data centers with limited space can increase computing power without growing thanks to liquid cooling.
It is not fatal to switch from air to liquid cooling. Many data centers employ an incremental strategy.
One technique that can encourage denser workloads, increase efficiency, and reduce energy consumption is a Liquid-to-Air Cooling (LAC) CDU. Because LAC CDUs use air as a heat transfer medium, water pipes are not required to link them to the data center. It allows companies to adapt their cooling strategy to the evolving needs of their data centers.
Another hybrid strategy is to retrofit rear door heat exchangers (RDHx) into air-cooled systems. Companies can continue to utilize air-cooled servers and add liquid cooling to them with the RDHx. For even more cooling capacity, a Liquid-to-Liquid CDU (LL CDU) cools the servers and equipment using the building's water system. It is one of the best and most durable methods for cooling large workloads.
When organizations embark on this journey, they are not alone. To guarantee a seamless transition to liquid cooling in data centers, the Dell specialists can design, develop, and execute a customized cooling plan.
An Innovative Approach to Data Centers
For data centers trying to balance performance, scalability, and cost, liquid cooling presents a compelling answer to the issues of high-density, high-performance settings. Although air conditioning is still effective for many, its drawbacks become increasingly apparent as electricity needs rise.Superior energy efficiency, increased scalability, and alignment with environmental objectives are all provided by liquid cooling, which provides a forward-thinking solution that prepares data centers to handle the demands of the IT infrastructure of the future. By assessing current and future needs and developing a phased transition plan, organizations may seamlessly make the switch to liquid cooling and be ready for data center operations in the future.
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