In the rush to slash energy consumption in power-hungry data centers, design teams, equipment manufacturers, and tech companies have been developing clever, low-energy cooling solutions—from Facebook’s open-rack server setup with exposed motherboards, to Skanska’s eOPTI-TRAX liquid refrigerant coil system, to Google’s evaporative cooling schemes.
Solutions like these have helped data center facility operators achieve unprecedented energy performance levels, with power utilization effectiveness (PUE) ratios dipping below 1.10 in some instances. This means that less than 10% of the total energy consumption in a facility is attributed to noncomputing functions, such as air-conditioning and lighting.
Now, a new technology promises to push the limits of data center energy efficiency even further. Called immersive cooling, it uses a liquid instead of air to cool the servers. LiquidCool Solutions, Green Revolution, and 3M are among the pioneers of this technology. Each system works a bit differently, but the basic idea is to submerge the motherboards in tanks filled with nonconductive fluid, which absorbs the heat generated by the processors.
LiquidCool Solutions, for example, uses an enclosed server module and pumps dielectric fluid through the server enclosure. Green Revolution uses a tub full of dielectric oil and circulates the liquid through the tubs. 3M also uses the tub approach, but the fluid boils and then is condensed to reject the heat.
By using liquid-based cooling at the server level, the need for air-conditioning is greatly reduced, or even eliminated in some climates. The same goes for traditional HVAC equipment and systems—chillers, fan units, raised floors, and so on.
The Allied Control 500 kW immersion-cooled data center in Hong Kong is capable of delivering a PUE of just 1.02. The standard, 19-inch server racks use 3M Novec Engineered Fluids to enable tight component packaging for greater computing power in less space, according to Allied. Its open-bath design permits easy access to hardware and eliminates the need for pressure vessel enclosures and charging/recovery systems. PHOTO: COURTESY ALLIED CONTROL
“In most parts of the world, compressorized cooling would not be required with immersive cooling, since the liquid temperatures can be at a level where direct heat rejection using outdoor condensers or cooling towers would be sufficient,” says Thomas Squillo, PE, LEED AP, Vice President with Environmental Systems Design, who is currently researching the technology for the firm’s data center clients. “The fan energy is also eliminated, both in the HVAC system and in the server itself. Fluid pumping energy is very low.”
Other advantages of the cooling technology, according to Squillo:
• Increased performance and service life of the computer chips by eliminating heat buildup and problems related to contaminated air and dust.
• Ability to deploy data centers in extremely harsh environments without greatly impacting energy performance.
• Potential construction cost savings by downsizing or eliminating traditional HVAC systems.
Other than a few pilot projects, including a Bitcoin mining data center in Hong Kong and a Lawrence Berkeley National Laboratory-led installation in Chippewa Falls, Wis., immersive cooling technology is largely untested. A year into the Bitcoin pilot, the data center operator reported a 95% reduction in cooling costs.
AEC professionals are starting to realize the potential for immersive cooling, especially for high-performance computing centers and consolidated, high-density data centers.
“Large data centers that have many homogenous machines at high density—like those operated by Internet and cloud providers—are a good application,” says Squillo. “Small footprint and minimal energy use are very important due to the volume of servers. These can be deployed in remote areas where space and energy are cheap, but where air quality may be a concern, without having to worry about the data center air.”
TRICKY DESIGN CONSIDERATIONS
Before the technology can be implemented, says Squillo, several nettlesome design factors specific to immersive cooling have to be addressed:
• Piping distribution to the racks and cooling units requires redundancy and valving to accommodate equipment maintenance without disrupting server performance.
• Additional equipment and space are needed to drain fluid from the tanks for server maintenance.
• Local code requirements may limit the amount of fluid that can be stored in a single room.
• For the foreseeable future, it’s unlikely that a large data center would be 100% liquid-immersion cooled. This means provisions will have to be made for both air- and liquid-cooling systems, which will require additional space in the data hall and mechanical room.
“I think that some form of this technology will definitely be the direction the data center market will take in the future,” says Squillo. “The market just needs to mature enough for owners to trust the technology and demand servers that are designed for a particular type of liquid cooling. In the short term, I see large companies and server manufacturers doing small-scale installations to test the concept, before wanting to implement it at a large scale.”
Related Stories
Products and Materials | Feb 14, 2022
How building owners and developers can get ahead of the next supply chain disaster
Global supply chain interruptions that started at the very beginning of the pandemic are still with us and compounding every step of the way. Below are a few proven tips on how to avert some of the costly fallout should we be faced with similar commercial disasters at any time in the future.
Urban Planning | Feb 14, 2022
5 steps to remake suburbs into green communities where people want to live, work, and play
Stantec's John Bachmann offers proven tactic for retrofitting communities for success in the post-COVID era.
Urban Planning | Feb 11, 2022
6 ways to breathe life into mixed-use spaces
To activate mixed-use spaces and realize their fullest potential, project teams should aim to create a sense of community and pay homage to the local history.
Senior Living Design | Feb 11, 2022
Design for senior living: A chat with Rocky Berg, AIA
Rob Cassidy, Editor of MULTIFAMILY Design + Construction, chats with Rocky Berg, AIA, Principal with Dallas architecture firm three, about how to design senior living communities to meet the needs of the owner, seniors, their families, and staff.
Architects | Feb 11, 2022
How computer simulations of vision loss create more empathetic buildings for the visually impaired
Here is a look at four challenges identified from our research and how the design responds accordingly.
Healthcare Facilities | Feb 10, 2022
Respite for the weary healthcare worker
The pandemic has shined a light on the severe occupational stress facing healthcare workers. Creating restorative hospital environments can ease their feelings of anxiety and burnout while improving their ability to care for patients.
Architects | Feb 8, 2022
Perkins Eastman and BLT Architects merge
Expanding services in hospitality, education, and mixed-use sectors to better serve clients.
Architects | Feb 3, 2022
SmithGroup elevates Mark Adams to lead workplace practice
In his new role, Adams leads the firm’s practice devoted to the design of corporate and commercial facilities.
Architects | Feb 2, 2022
Steven L. Pliam joins LEO A DALY as Design Technology Leader
Pliam will oversee the deployment and use of technologies such as computational design, parametric design, digital practice, reality capture, visualization, virtual/augmented reality, GIS and AI/Machine Learning.
Architects | Jan 31, 2022
Heatherwick Studio proposes new public waterfront site for Seoul
Heatherwick Studio was recently selected as part of the team by the Seoul Metropolitan Government to create a new sports and cultural district for the city.
