Data center cooling used to be an easier concept to explicate. You might say, “Keep cold air moving toward the servers, pull hot air away, and make sure the room temp does not get out of hand.”

Now that data centers are bolstering AI, high-density server racks, edge data centers, cloud growth, and equipment that produces a tremendous amount of heat in a very small footprint, traditional cooling is out the window.

Data center cooling trends are moving towards liquid cooling, immersion cooling, rear door heat exchangers, free cooling, hybrid cooling systems, modular cooling infrastructure, and AI-driven thermal management. It’s getting convoluted trying to work with limited floor space, tight budgets, and energy efficiency requirements, but we are here for the challenge.

Why Data Center Cooling Is Changing

Switching up cooling technologies isn’t a form of entertainment for data center operators. Energy consumption and operational costs are on the rise. Customers want the benefits of more impressive computing power, but communities are also paying very close attention to water use, especially. The environmental impact of data center cooling is perhaps the largest contributor to expansion within the field of advanced cooling technologies.

Air Cooling Still Has A Place

Air cooling isn’t gone from the data center cooling system world. In actuality, most data centers still use air cooling systems in some form.

Not all data centers are those high-density racks that are the big conversation points right now. Some air cooling approaches can work up to around 35 kW per rack, which makes air cooling the affordable, smart decision for those in this area of the data center industry.

The problem commences when heat generation rises beyond what traditional cooling methods can comfortably handle. More fans, colder supply air, and more A/C can only take you so far before the system becomes unsupportable.

Liquid Cooling Is Moving Fast

In the data center cooling market, liquid cooling systems are, with reasonable likelihood, the most alluring at this time. Liquid hauls heat with supurb competence, placing it front and center in the global data center ecosystem. You can cool high thermal loads in confined spaces without trying to use air to keep up. Liquid cooling solutions can support much higher rack densities of up to 150 kW per rack, contingent on the design. That carries weight for AI workloads, advanced GPUs, and other modern computing equipment. Liquid cooling also reduces both energy use and noise in data centers, which is fantastic news for your team.

Immersion Cooling Has Its Own Lane

Modern cooling technologies subsume immersion cooling. Instead of sending coolant through cold plates, immersion cooling systems submerge electronics in dielectric fluids. Single-phase immersion cooling keeps the fluid in liquid form while it absorbs heat.

Immersion cooling can reduce noise, handle high heat loads, and eradicate some airflow dilemmas. But it changes data center infrastructure and how IT equipment is accessed. Direct-to-chip cooling could still be the most valuable cooling solution for smaller centers, since immersion is a colossal shift for all team members.

There are also other advanced cooling systems:

• Free cooling uses outside air or outside conditions to reduce mechanical cooling. In cooler climates, including many Midwest locations, this can lower your carbon footprint.
• Economizers, evaporative cooling, and closed-loop cooling systems all have their uses. Evaporative cooling can be efficient, but it depends on water. Closed-loop systems can reduce water usage but may require different equipment and planning.
• Heat reuse is gaining attention. Waste heat from data centers can sometimes be captured and used to warm nearby buildings or support other heating needs. It will not work everywhere, but it is the sort of idea more operators are going to explore as the pressure surrounding energy use increases.

Hybrid Cooling Is Probably The Near Future

Doing what’s always been done isn’t how we create efficient cooling solutions that work with the planet as opposed to against it. There’s no sense in choosing just one method when your data center equipment might benefit from a clever combination of techniques.

Hybrid cooling systems make more sense than just hoping your air conditioning keeps up. Use air cooling for lower-density servers, but use liquid cooling for AI racks or other high-density equipment. Add rear door heat exchangers where they fit, and implement free cooling when the climate permits it. Add modular chiller units when capacity needs to scale faster.

New data centers have the incredible benefit of being able to be designed around multiple cooling technologies from their inception. Existing data centers have to be more careful.

Cooling efficiency and cooling brilliantly is the way of the future. This is done by understanding your rack density, heat load, energy costs, water limits, growth plans, and existing infrastructure. HMS can help you do more than simply prevent your servers from overheating. We can and will build innovative cooling technologies into your business model if you will let us, so that you are leading the charge towards something better.