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Home ยป The Rise of Hybrid Cooling in African AI and HPC

The Rise of Hybrid Cooling in African AI and HPC

Writer: Jonathan Duncan, technical director for Africa at Vertiv

Techeconomy by Techeconomy
August 27, 2024
in DisruptiveTECH
0
AI and HPC by Jonathan Duncan, Vertiv
Jonathan Duncan, Vertiv

Jonathan Duncan, Vertiv

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The future of IT thermal management is hereโ€ฆ and itโ€™s a hybrid of air and liquid cooling technologies.

Enterprises across the globe are adopting high-performance computing (HPC) for artificial intelligence (AI) and machine learning (ML) model training and inference, causing a swift rise in chip, server, and rack power consumption, thus increasing heat dissipation levels.

Traditional air cooling alone within a data centre is not able to accommodate hot-running HPC equipment effectively, meaning that many data centre teams are strategising how best to design their cooling strategies future-ready in support of evolving business requirements.

Data centres must continue to be run efficiently, in a manner that addresses potential infrastructure risks. One such solution is the combined use of both air and liquid cooling options.

Anticipated growth of liquid cooling technology

According to a โ€œMarketsandMarketsโ€ โ€˜Data Center Liquid Cooling Marketโ€™ report, the global data centre liquid cooling market is projected to increase from USD 2.6 billion in 2023 to USD 7.8 billion by 2028; thatโ€™s a compound annual growth rate (CAGR) of 24.4 percent during the forecast period.

This development is primarily being driven by the requirements for increased cooling efficiency, energy savings, scalability, sustainability and higher performance.

In Africa, where climate and infrastructure issues loom large, there are additional pressing reasons to look at the efficiencies of liquid cooling technologies in data centres.

Fighting water issues withโ€ฆ water?

One of the main challenges when considering cooling solutions for data centres is the fact that servers need to be kept within certain temperature and humidity limits to function optimally.

As a case in point, Africa is the second-driest continent โ€“ behind only Australia โ€“ with two thirds of it classed as arid or semi-arid.

The 2023 / 2024 El Niรฑo weather phenomenon has had a devastating effect on large parts of the region, creatingย extreme weather effects, including drought andย heatwaves, which scientists say are becoming increasingly frequent and severe because of climate change.

At the same time, infrastructure issues around water availability and usage is another concern that must beย constantly addressed within the data centre arenaย across the continent.

Using liquid cooling solutions within the data centre system offers one way to avert issues โ€“ if they are using โ€˜closed loopโ€™ liquid cooling technology, which means that once the system pipes have been filled with water, there is no water waste.

Moreover, a closed water loop is capable of capturing heat to utilise it to warm nearby offices, homes or farms, supporting the circular economy.

Getting ready to deploy liquid cooling in the data centre

For African organisations preparing themselves to deploy liquid cooling, they must be aware of the fact that this is a significant initiative that requires careful planning and consideration of โ€“ among other factors – the existing facilityโ€™s footprint, current thermal management strategy, workloads, and budget.

A roadmap to kicking off this type of cooling strategy should include the following steps:

Determining current and future workflow requirements:ย IT and facility teams must decide how much space to allocate to new AI / HPC workloads to support current demand and growth over the next few years.

Some will convert a few racks at a time, while others could allocate entire rooms for these workloads and supporting the addition of liquid cooling systems.

Conducting a site audit:ย Before developing a business case, teams need to know if retrofitting a facility with liquid cooling systems is technically and economically feasible.

The IT and facility team should work with partners to conduct a thorough site audit, including the following steps:

  • Performing a computational fluid dynamics (CFD) study of existing airflows in the facility.
  • Analysing existing air-cooling equipment to see if it provides enough capacity to be leveraged in the new hybrid cooling infrastructure and if current piping can be reused.
  • Performing a flow network modelling (FNM) analysis to evaluate the ability of the liquid cooling system to support server liquid cooling requirements.
  • Executing water and power usage effectiveness (WUE and PUE) analyses to determine how efficiently they are using water and power resources.
  • Carrying out a total cost of ownership (TCO) study to optimise operations by replacing old or inefficient equipment to lower operational costs.
  • Examining infrastructure to see if it can be adapted for use with more power-intensive workloads, such as AI.
  • Reviewing physical space to see if raised floors can support the combined weight of new power and hybrid cooling systems, and determine access routes for piping.
  • Checking the facility for potential required maintenance of existing infrastructure.
  • Reviewing the on-site water supply, to determine if it is suitable for use in planned liquid cooling systems.
  • Addressing any safety regulation compliance concerns.

Modelling new infrastructure in the desired space:ย With this data and partner support, IT and facility teams can model the desired hybrid cooling infrastructure in the data centre and identify obstacles to overcome, such as weight restrictions, a lack of on-site water, the need to install new piping, access route concerns, and other issues.

Once all issues have been addressed, it is a good idea to contract with a vendor to construct a digital twin replica of the new design to explore new systems and processes in 3D.

Considering budget and site impacts:ย The audit and modelling exercise provides the IT and facility team with insight into how extensive the liquid cooling deployment will be to develop a business case for executive consideration.

The IT and facility team will also want to consider how on-site construction will disrupt current operations and what impact adding extra heat loads on site will have on current workloads and service-level agreements (SLAs).

Factoring in efficiency and sustainability gains:ย Since liquid cooling removes heat at the source, it can be more efficient than air cooling alone and lowers facilitiesโ€™ PUE metrics.

By using water or fluid to cool systems and allows teams to recapture and reuse heat, reducing wasted energy and supporting the circular economy.

These gains can reduce indirect or energy-regulated emissions for enterprises. As a result, liquid cooling can be an essential part of enterprisesโ€™ sustainability programmes.

Designing the new solution:ย With this information, a new solution customised for site requirements can be designed, whereafter a design with a bill of materials and required services, issue quote requests and select the manufacturers to build and integrate the liquid cooling system.

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