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Energy Consumption in Data Centers: Air versus Liquid Cooling

Rising Energy Demand in Data Centers

Growing demand for digital services, including cloud computing, artificial intelligence, and other data-intensive technologies is increasing global data center energy consumption. According to International Energy Agency (IEA), data centers consumed an estimated 200 TWh of electricity in 2022 and are expected to grow to 400 TWh by 2030. As the data center industry continues to evolve and address rising energy consumption challenges, investors have opportunities to support and capitalize on advancements in energy-efficient technologies that innovate and improve sustainability.

Cooling and Energy Consumption in Data Centers

McKinsey and Company estimates that cooling accounts for nearly 40% of the total energy consumed by data centers, emphasizing the importance of implementing efficient cooling practices to reduce energy consumption and improve overall energy efficiency.

40% of data center energy consumption is for cooling

Data centers use a common metric known as Power Usage Effectiveness (PUE) to measure energy efficiency, a ratio that compares the total energy consumed by a data center, to the energy consumed just by the IT equipment.

PUE = Energy consumed by the whole facility / Energy consumed by the IT Equipment

A PUE of 1.0 means that the data center is perfectly efficient, while a PUE of 2.0 means that the facility infrastructure is consuming twice as much power as the IT equipment. Data center operators measure PUE to meet efficiency initiatives and identify areas for improvement. The average annual power usage effectiveness (PUE) reported in 2022 was 1.55, representing a slight improvement over the 2021 average of 1.57 but consistent with the trend of marginal PUE gains Uptime Institute observed annually since 2014.

Data centers aim to reduce PUEs to 1, maximizing compute performance for energy spent, but currently average 1.55

However, the most efficient large hyperscale facilities achieved a PUE value of 1.2 compared to other facilities that have PUE values greater than 1.6, which means for every kW of power used for the IT task, another 600 W is consumed to power the cooling and other infrastructure equipment.

PUE by Data Center Space Type

For each kW used in a data center, it takes 200-600W to cool the IT equipment

Improve Energy Efficiency with Innovative Cooling Technologies

Efficient cooling practices play a crucial role in achieving a lower PUE. By implementing innovative cooling technologies, such as liquid cooling, hot and cold aisle containment, or optimized airflow management, data centers reduce the energy consumed by cooling infrastructure, leading to improved energy efficiency. The adoption of liquid cooling in data centers is gaining momentum due to its ability to deliver more efficient and effective cooling than air-cooling, especially high-density IT racks.

Energy efficient liquid cooling drives down PUE compared to air cooling

The PUE analysis of a High-Density Air-Liquid Hybrid Cooled Data Center published by the American Society of Mechanical Engineers (ASME) studied the gradual transition from 100% air cooling to 25% air –75% liquid cooling. The study observed a decrease in PUE value with the increase in liquid cooling percentage. In the 75% liquid cooling case, 27% lower consumption in facility power and 15.5% lower usage in the whole data center site were obtained.

Even a partial, 75% transition from air to liquid cooling reduces facility power use by 27%

The PUE metric does not consider IT or networking equipment efficiency and provides a benchmark to evaluate efficiency gains over time within a data center facility, not comparing one facility against another. Regardless, it remains the de-facto standard to measure and compare data center energy efficiency. Despite its shortcomings, PUE provides a useful baseline to assess and improve a facility’s infrastructure efficiency.

Liquid cooling is so effective in improving IT equipment performance and reducing energy required to cool, it obsoletes the industry’s PUE metric

The data center industry continues to work on new metrics to more accurately measure its energy efficiency. TUE is one such metric that considers the efficiency of the IT equipment, the cooling system, and other factors affecting energy consumption in data centers.

TUE = (Energy consumed by the whole facility) / (Energy consumed by the IT Equipment + Cooling Equipment)

Boyd’s Innovative Data Center Cooling Solutions

Boyd has decades of experience and expertise innovating and manufacturing cooling solutions like coolant distribution units, 3D vapor chambers, liquid loops and cold plates, remote heat pipe assemblies, and chillers for data centers. Leverage our liquid cooling and material science heritage to design innovative AI-based solutions optimized for performance, reliability, and energy efficiency.

Our engineering and material science expertise allows us to design custom cooling solutions for specific data center types. To learn more about our thermal management solutions or to discuss your project needs, schedule a consultation with our experts.

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