Powering the Digital Age Responsibly: Sustainable Data Centre Cooling Solutions


Inemesit Ukpanah As the digital age expands, the demand


for data centres is growing. These facilities are critical components of modern busi- ness infrastructure, providing computing resources and storage capacity for com- panies of all sizes. However, data cen- tres consume vast amounts of energy and contribute to greenhouse gas emissions, making it essential to find sustainable cool- ing solutions to minimise environmental impact.


Sustainability has become a buzzword


across industries in recent years, and data centres are no exception. The need for energy-efficient cooling solutions is driven by environmental concerns and the escalat- ing energy costs associated with traditional cooling methods. The most significant chal- lenge data centres face is cooling, which can account for up to 40 percent of their total energy usage.


The Earth's Cooling Gift One of the primary concerns with data


centres is their voracious appetite for ener- gy, especially for cooling systems that pre- vent servers from overheating. This is where nature lends a hand, with the Earth offering a sustainable solution. Geothermal energy, a silent champion in renewable energy, has quietly made its way into the heart of data centre operations.


Imagine a data centre that doesn't rely solely on power-hungry air conditioning systems but instead taps into the Earth's natural cooling potential. These innova- tive centres can significantly reduce their carbon footprint and energy consumption by utilising geothermal energy. This method harnesses the Earth's stable underground temperatures, which resonates with geolo- gists studying the Earth's geological pro- cesses.


Geothermal Cooling: Harnessing the Earth's Energy One innovative cooling solution that


geologists can help implement is geother- mal cooling. This method uses the near-con-


32 TPG • Jul.Aug.Sep 2024


stant temperature of the Earth just below the surface to provide cooling capability. Geothermal cooling is implemented using a closed-loop piping system filled with water and a coolant that runs through vertical wells under the ground, filled with a heat- transferring fill.


This sustainable cooling method has been


successfully utilised in projects such as Iron Mountain Data Centers, which achieved a total savings of 34 percent in Power Usage Effectiveness (PUE). However, identifying suitable locations for geothermal cooling systems, assessing the geological condi- tions, and ensuring the proper implemen- tation of these systems is very important.


Geothermal Cooling Conundrum Many geothermal wells, tapping into


the natural coolness of the bedrock at 50 degrees Fahrenheit (10 degrees Celsius), offer a starting point. However, the question arises: where does the additional cooling come from if the data centre needs lower temperatures?


The answer lies in augmenting geother-


mal cooling with traditional cooling systems or innovative technologies such as absorp- tion chillers, which can utilize geothermal heat to further cool the water or refrigerants to the desired temperatures. This combined strategy ensures that data centres attain the required cooling levels by combining energy sustainability with cooling technol- ogy accuracy.


By managing the extraction process,


the geothermal system can remain a reli- able source of cooling without causing the ground to become thermally saturated. However, while environmentally friendly, this innovative approach introduces new challenges and considerations, especially in regions with high ambient subsurface temperatures, which might make it seem less feasible.


This involves extensive use of geothermal


wells, which could increase bedrock tem- perature, and is a valid concern. However, this can be effectively managed by pulsing


the geothermal wells, a technique that involves alternating the use of different sections of the wellfield.


Additionally, implementing hybrid sys-


tems that combine geothermal energy with other renewable sources like solar power can further enhance cooling capabilities, ensuring that data centres can maintain their critical temperatures efficiently even in the hottest environments. By distributing the cooling demand across various wells and allowing unused sections to "recover," the geothermal system can maintain its efficien- cy without unduly warming the bedrock.


However, geothermal cooling faces its


greatest challenge in adapting to hot envi- ronments in regions where the ambient subsurface temperatures are inherently high. Here, the focus shifts to the depth and design of the geothermal wells.


Deeper wells can access higher tempera-


tures, albeit at a higher initial cost. Advances in deep geothermal well technology, which can access higher temperatures at greater depths and integrate phase-change materi- als that enhance thermal storage, are crucial adaptations. These technologies allow for more efficient extraction and use of geo- thermal energy, tapping into the Earth's heat for electricity generation and direct heating applications.


Additionally, enhancing the system's


design to maximise heat exchange and incorporating other sustainable cooling technologies can help offset the limitations of warmer geothermal conditions. These innovations allow geothermal systems to maintain efficiency even in warmer geogra- phies by effectively storing and transferring thermal energy.


Geothermal cooling is at the forefront of


innovation regarding data centres, combin- ing the need for cooling with a focus on sus- tainability. Setting up a cooling system for data centres involves initial costs, including drilling, system installation, and infrastruc- ture development.


Despite the expenses, the long-term


benefits in terms of energy savings and potential reduction in carbon emissions jus-


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