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
AEC Innovators | Aug 27, 2019
7 AEC industry disruptors and their groundbreaking achievements
From building prefab factories in the sky to incubating the next generation of AEC tech startups, our 2019 class of AEC Innovators demonstrates that the industry is poised for a shakeup. Meet BD+C’s 2019 AEC Innovators.
Giants 400 | Aug 16, 2019
2019 Healthcare Giants Report: The ‘smart hospital’ is on the horizon
These buildings perform functions like a medical practitioner. This and more healthcare sector trends from Building Design+Construction's 2019 Giants 300 Report.
AEC Innovators | Aug 15, 2019
Oracle’s replica of a construction jobsite creates an immersive environment for AEC professionals
The Oracle Construction and Engineering Innovation Lab allows visitors to walk through five different stages of construction work, to test new AEC technologies and training techniques.
Giants 400 | Aug 15, 2019
Top 140 Multifamily Sector Architecture Firms for 2019
Humphreys & Partners, KTGY, SCB, CallisonRTKL, and Perkins Eastman top the rankings of the nation's largest multifamily sector architecture and architecture engineering (AE) firms, as reported in Building Design+Construction's 2019 Giants 300 Report.
Giants 400 | Aug 13, 2019
2019 Science + Technology Giants Report: Operational flexibility is a must for S+T buildings
The science and technology (S+T) sector is arguably the industry’s most complex because it caters to a diverse clientele with specific priorities and imperatives, according to Building Design+Construction's 2019 Giants 300 Report.
Architects | Aug 12, 2019
AIA, NCARB help launch coalition to represent complex professions and licensing boards
Architects, registration boards, and others join effort to ensure a unified voice for professions in growing debate around licensure, regulation, and public safety.
AEC Innovators | Aug 9, 2019
Improving architectural designs through iteration
Computational design lets ZGF Architects see patterns that renderings and even models can’t show.
Giants 400 | Aug 8, 2019
Top 200 Office Sector Architecture Firms for 2019
Gensler, AECOM, Perkins+Will, Stantec, and HOK top the rankings of the nation's largest office sector architecture and architecture engineering (AE) firms, as reported in Building Design+Construction's 2019 Giants 300 Report.
Giants 400 | Aug 8, 2019
2019 Office Giants Report: Demand for exceptional workplaces will keep the office construction market strong
Office space consolidation and workplace upgrades will keep project teams busy, according to BD+C's 2019 Giants 300 Report.
Museums | Jul 29, 2019
A new museum debuts inside the Empire State Building
A $165 million, 10,000-sf museum opened on the second floor of the Empire State Building in New York City, completing the second of a four-phase “reimagining” of that building’s observatory experience, which draws four million visitors annually.