Next-Gen Thermal Management: Cooling Data Centers, EVs & Defense

Heat is having a moment — not because it’s new, but because modern technology is finally running out of room to ignore it.

Whether it’s an AI-heavy data center packing ever more compute into a single rack, an electric vehicle trying to fast-charge without degrading its battery, or rugged electronics operating in demanding defense environments, the story keeps repeating: power is rising faster than traditional cooling can keep up. And once you hit thermal limits, performance, reliability, and even safety can be capped — no matter how advanced the hardware is.

Across industries, a new playbook is emerging. It combines liquid cooling, smarter power delivery, advanced manufacturing, and software-driven control — all aimed at one goal: keeping critical components in the right temperature window, consistently, efficiently, and at scale.

Why heat is the real limiter

Every electronic system is an energy conversion machine. The energy that doesn’t become useful work becomes heat. As chips, power electronics, and battery packs do more work per unit volume, heat becomes more concentrated — creating hot spots that can trigger throttling, failures, or accelerated wear.

In data centers, the stress is amplified by the rise of AI and high-performance computing. Allegro MicroSystems notes that hyperscale data centers supporting AI and large language models are driving up power consumption — and that effective thermal management is now essential for performance, reliability, and energy efficiency.

A practical way engineers talk about this is thermal design power (TDP) — a measure tied to how much heat a processor can generate under typical workloads. As TDP increases over time (especially for high-performance CPUs and GPUs), cooling systems that worked a few years ago start to look underpowered.

Data centers: how air cooling works — and why it’s hitting a wall

For decades, most data centers relied heavily on air cooling: big HVAC equipment, raised floors, and fans pushing cool air to server fronts while pulling hot air away from the backs.

In a common setup described by Allegro, Computer Room Air Handlers (CRAHs) pull hot air in, pass it over cooling coils (often chilled-water supplied), and push cooled air back into the room. Fan performance matters a lot, because moving air is the engine that makes the whole system work.

But air has a physics problem: it’s simply not a great heat mover compared to liquids. Allegro points out that air’s lower heat capacity and poorer heat conduction can lead to hot spots, and it takes a lot of energy to move the large volumes of air needed for cooling in high-density environments.

Data centers have tried to squeeze more performance from air-based systems using layout strategies like hot-aisle/cold-aisle arrangements, which reduce mixing between supply and exhaust air.

Air cooling still has advantages: lower upfront cost, simpler installation, and typically lower maintenance burden compared with liquid systems. But the direction of travel is clear: when racks and chips get dense enough, air becomes an increasingly expensive way to move heat.

The shift to liquid cooling: bringing coolant close to the heat

The big idea behind liquid cooling is simple: bring the coolant much closer to the heat source.

Allegro describes liquid cooling as a more efficient heat-transfer approach because liquids have better thermal conductivity than air and can remove heat more directly. The result can be higher cooling efficiency, lower energy use, and support for higher compute density.

Both Allegro and Airedale by Modine focus on three major liquid-cooling approaches that are becoming increasingly central in data centers:

Direct-to-chip cooling

This uses cold plates attached to the hottest components — CPUs, GPUs, and sometimes memory — and circulates coolant through those plates. Allegro describes this as circulating dielectric fluid through cold plates attached to high-power components, carrying the heat away to a heat exchanger.

Airedale explains the benefit in plain terms: direct-to-chip cooling hits the heat at the source, supporting higher-density systems while reducing the need for extreme airflow (and the fan power and noise that comes with it).

What’s the catch? Airedale notes that adopting direct-to-chip often requires compatible server platforms and new plumbing infrastructure — manifolds, pumps, fluid management design, and leak detection — plus capital investment.

Immersion cooling

Immersion cooling goes one step further: it submerges servers or boards in non-conductive (dielectric) fluid.

Allegro breaks immersion into:

• Single-phase: fluid stays liquid; it warms up and is pumped to a heat exchanger.
• Dual-phase: a low-boiling-point fluid vaporizes at hot surfaces, then condenses and returns — an efficient “boil and re-condense” cycle.

Airedale frames immersion cooling as especially relevant for extreme-heat workloads like AI training and real-time analytics, emphasizing that the dielectric fluid is non-conductive, so electronics can operate while the fluid absorbs heat across surfaces.

Airedale also highlights operational upsides: eliminating fans can reduce power draw; immersion can reduce airborne contamination risk and potentially extend component life; and it can enable rack densities that are difficult with air cooling. But it’s not plug-and-play — special enclosures, trained staff, and often custom server configurations are part of the equation.

Rear-door heat exchangers

A “hybrid-ish” approach keeps servers air-cooled internally but captures heat at the rack boundary.

Allegro explains that rear-door heat exchangers integrate a liquid loop into the back door of a server rack: hot exhaust air passes through the exchanger, gets cooled by circulating fluid (often chilled water), and returns cooler air to the aisle. This reduces the burden on room-level cooling and supports higher rack densities than air alone.

Cooling is now a control problem, not just a hardware problem

Moving to liquid cooling doesn’t simply swap one technology for another — it changes what “thermal management” means.

Allegro describes a key shift: instead of moving huge volumes of air, the challenge becomes precisely controlling fluid dynamics — pressure regulation, flow control, and system coordination.

Airedale pushes this idea into the “next phase”: the future isn’t just liquid cooling, it’s intelligent integration — including hybrid systems that adjust cooling strategies dynamically using sensor feedback.

Airedale also notes growing use of AI and machine learning to analyze facility data, predict cooling needs, detect anomalies, and optimize system operation in real time — improving uptime while reducing energy consumption.

And this trend isn’t limited to the largest players. Airedale points to industry momentum led by companies like Microsoft, Google, and Amazon Web Services investing in direct-to-chip and immersion approaches for AI and machine learning growth.

The hidden enabler: 48V power distribution

Cooling isn’t only about heat exchangers and fluids; it’s also about how power gets delivered to the fans, pumps, and control systems running the show.

Allegro highlights a key infrastructure transition: moving from traditional 12V distribution toward 48V power systems in data centers.

Why it matters:

• Lower current for the same power reduces resistive losses (wasted heat in wiring).
• Smaller cabling can deliver more power with less bulk, freeing space in racks.
• Better conversion efficiency can reduce losses in stepping down from high-voltage AC to usable voltages.

In other words, as cooling becomes more pump-driven and control-heavy, the power architecture evolves to support it efficiently.

Manufacturing is changing what cooling hardware can be

As cooling moves closer to the heat source, hardware design gets more complex. Traditional machining can struggle to produce tiny internal channels, lattice-like surfaces, or conformal shapes that follow the contours of components.

That’s where advanced manufacturing — especially metal additive manufacturing — enters the thermal story.

A case study from the AMRC explores how additive manufacturing (AM), including laser powder bed fusion (LPBF), can create heat management structures that conventional manufacturing can’t.

Why these shapes matter

Heat exchangers work better when they have:

• more surface area for heat to move into the fluid, and
• flow features that improve heat transfer without making pumping too costly.

AMRC describes designing internal channels and lattice structures using triply periodic minimal surfaces (TPMS) and gyroid patterns, chosen for high surface-area-to-volume ratios and for encouraging flow regimes that can enhance heat transfer.

They used computational fluid dynamics (CFD) to evaluate flow paths while also considering manufacturability limits like printable wall thickness and support needs.

The “not glamorous but critical” part: cleaning the inside

One real-world obstacle to printing intricate channels is removing unmelted powder trapped inside. AMRC reports trialing build orientations that help powder flow out by gravity, using advanced depowdering systems, and verifying results with CT scans.

What they achieved

AMRC reports successfully fabricating cylindrical prototype heat exchangers (around 100 mm tall and 45 mm diameter) in aluminum alloy AlSi10Mg, demonstrating feasibility for complex designs.

Testing results included:

• heat transfer coefficients ranging from 100 to 450 W/m²·K, placing them within or above the performance envelope of conventional aluminum heat exchangers,
• pressure drops ranging from 30 Pa to 780 Pa depending on internal geometry, underscoring trade-offs between heat transfer and pumping cost.

The big takeaway: next-gen thermal systems aren’t just “better coolers.” They’re engineered flow devices, and manufacturing capability increasingly determines what thermal designs are even possible.

Defense electronics: when cooling must be embedded, rugged, and reliable

Thermal demands don’t only come from commercial AI. High-power electronics for defense applications can face tight packaging, high heat flux, and strict reliability needs — pushing designers toward cooling that is more integrated than bolt-on.

In the YouTube video “Next Gen Thermal Management for Defense Systems,” the description emphasizes an advanced manufacturing method — stack forging — that “lets us embed high efficiency liquid cooling directly into aluminum copper components.”

A related page from Alloy Enterprises describes what this integration is aiming for: their Stack Forging process produces “leak-tight, single-piece components with embedded microgeometries,” with claimed performance benefits including reduced pressure drop by up to 4× and improved thermal resistance by over 35%, lowering pumping power and energy use.

Even without diving into the most technical details, the direction is important for general readers:

• Integrated flow paths can reduce the number of seals, joints, and interfaces — common places where leaks or failures can occur.
• Lower pressure drop means pumps don’t have to work as hard (which saves energy and reduces heat added by the pumping system itself).
• Thermal resistance improvements mean the system can move heat away more effectively for a given size.

This “cooling is part of the structure” mindset mirrors what we’re seeing in data centers and EVs — just applied to hardware where reliability margins can be unforgiving.

Electric vehicles: why thermal management can matter more than battery size

When people talk about EV progress, battery size and chemistry get most of the attention. But Magna argues the next leap is about thermal management systems that keep batteries in their optimal window under all conditions — fast charging, stop-and-go driving, extreme cold, and summer heat.

In a tech talk written by Martin Winter, Magna notes that high-voltage traction batteries must operate within a narrow temperature range to deliver performance, longevity, and safety. As charging demands increase, thermal loads rise — and systems must balance charging power, compact packaging, thermal stability, cost, and sustainability.

Fast charging raises the thermal stakes

Magna describes today’s common approach — liquid-cooled plates or channels that transfer heat between cells and coolant pathways — as effective under moderate charging. But ultra-fast charging introduces significantly higher thermal loads, and without rethinking flow paths and system architecture, that extra heat can accelerate cell aging and reduce long-term performance.

From cooling to thermal control

A particularly important point: Magna frames modern thermal management as temperature control, not just “removing heat.”

Efficient heat pathways can also help batteries warm up faster and more consistently in cold environments, improving charging reliability and winter range. Magna even notes future architectures may enable more direct, cell-level control.

AI and simulation enter the EV thermal loop

Magna highlights the growing role of advanced simulation and AI in thermal system design — running many “what-if” scenarios early, saving time and materials before prototypes exist.

They also describe AI-assisted control during operation: analyzing temperature data, predicting hot spots, and adjusting coolant flow to prevent degradation — supporting safety, battery life, and charging efficiency.

In other words, EV thermal management is converging with data center thermal management in a surprising way: both are becoming data-driven, predictive control systems.

The common thread across industries: heat is now a systems problem

If you step back, these stories — data centers, EVs, and defense electronics — are really about the same engineering shift:

1) Get closer to the heat

Direct-to-chip plates, immersion tanks, battery cooling channels, embedded microchannels: the closer the cooling pathway is to the heat source, the more efficiently heat can be removed.

2) Manage flow intelligently

Better cooling is often about better flow: not just moving more coolant, but moving it in the right pattern, at the right pressure, at the right time.

3) Balance heat transfer and pumping cost

AMRC’s measured pressure drops across different internal geometries make this trade-off tangible: designs that improve heat transfer can increase resistance to flow, which requires more pumping energy. Alloy’s emphasis on reducing pressure drop reflects the same balancing act from another manufacturing approach.

4) Treat thermal management as a competitive advantage

Airedale frames liquid cooling as tied to performance, scalability, and sustainability in data centers, while Magna describes intelligent thermal systems as enabling faster charging and longer battery life — turning thermal control into a differentiator rather than a background necessity.

Where the “next-gen cooling” roadmap is heading

Based on the sources, the near-future direction looks like this:

• More hybrid systems (air + liquid, direct-to-chip + immersion) that adapt dynamically.
• More sensor instrumentation and AI control to predict hot spots, reduce wasted cooling effort, and catch anomalies early.
• More manufacturing innovation to create internal geometries that were previously impossible, enabling higher performance in smaller packages.
• Power delivery changes (like 48V architectures) that support cooling hardware efficiently rather than adding new losses.

The quiet conclusion is that “thermal” is no longer just about keeping things from overheating. It’s becoming the infrastructure that determines what performance is possible.

References

1. https://www.youtube.com/watch?v=4d6VWLaKnSo

2.https://www.allegromicro.com/en/insights-and-innovations/blogs/data-center-thermal-management-strategies

3.https://www.airedale.com/2025/04/29/how-next-gen-cooling-solutions-are-reshaping-thermal-management/

4.https://www.amrc.co.uk/case-studies/manufacturing-the-next-generation-of-thermal-management-systems

5.https://www.magna.com/stories/tech-talks/2026/why-thermal-management--not-battery-size--will-define-the-next-generation-of-evs