Powering high-density data centers

The shape of data centers is changing

With AI training clusters and high density colocation sites pushing rack power higher than ever, data centers are being reimagined to deliver more computing capacity within increasingly constrained footprints. Land constraints near fiber, power and metropolitan load centers are accelerating this trend, creating shrinking rooflines and denser white space - up to 10x the floor-area density of traditional layouts in some projects. Thermal management must keep pace, delivering more capacity in less space while preserving deployment speed and minimizing site complexity.

Against that backdrop, Johnson Controls has introduced the YORK® YDAM, an air-cooled, magnetic-bearing centrifugal chiller designed specifically to solve the space, logistics and scaling hurdles of multistory data centers and AI factories. With up to 3.5 MW of cooling per unit and a package optimized for transportation and rigging, YDAM aims to raise capacity density by up to 20%* over alternative solutions, so operators can meet megawatt targets with fewer machines and less roof areas.

YDAM is made for this moment

AI and high‑performance computing are concentrating loads into zones that exceed the assumptions of legacy plant designs. The result is a paradox: you need more cooling per square foot, but every square foot of rooftop is more valuable and harder to allocate. In statements accompanying the launch, Johnson Controls noted that vertical sites can unlock growth in constrained markets, yet they demand maximum cooling output in minimum space, a requirement the company argues YDAM is built to address by allowing operators to cut the number of chillers on site by up to half, depending on project specifics. Fewer units can translate into simpler electrical distribution, less structural steel, fewer crane picks, and more streamlined project execution. 

The other imperative is water. Many jurisdictions are tightening water-use approvals, and hyperscale operators are adopting water-neutral or water-free design preferences wherever climate allows. YDAM is air-cooled and based on the YVAM magnetic-bearing platform, which is a technology line recognized for high efficiency and zero water consumption right out of the box.

*Performance results, including higher capacity density, are based on several factors, including but not limited to system configurations, operating temperatures, site conditions, and maintenance routines. Actual outcomes may vary and are not guaranteed.

Capacity, density and logistics: what’s different about YDAM

The headline figure is capacity: up to 3.5 megawatts from a compact, air‑cooled centrifugal platform. That’s paired with a packaging and form factor optimized for the realities of procurement and construction. The chiller fits on a standard 53‑foot flatbed trailer, which simplifies long‑haul transport, reduces rigging complexity and can lower lift durations and street‑closure windows for urban sites. When machine count drops and logistics streamline, program risk and schedule exposure generally follow. Johnson Controls indicates shipments begin in late 2026, giving design teams a near‑term horizon for specification and phasing.

Under the hood, magnetic‑bearing compressors are central to the value proposition. By minimizing mechanical losses and enabling stable operation at elevated chilled‑fluid setpoints, the YORK® YDAM supports “warm‑water” cooling profiles (e.g., ~45 °C) that match the latest generations of inference and training GPUs. This alignment reduces lift, which is the temperature difference the chiller must overcome between the cooling loop and heat rejection and improves system efficiency under typical data center temperature programs. It also enables wider approach temperatures, allowing for smaller pumps and lower pumping energy, with incremental savings that add up across a campus.

Where it fits: from rooftop grids to staged expansions

For developers stacking multiple data halls vertically, roof area per MW is often the binding constraint. A high‑density chiller that delivers more cooling per unit footprint allows tighter rooftop arrays and fewer penetrations, which simplifies structural coordination and reduces waterproofing risk over the life of the building. In brownfield or phased greenfield projects, higher unit capacity can also support modular block deployments where each block (power + cooling + white space) ramps independently to match tenant demand and power availability. The ability to ship on a standard flatbed further aid phased workstreams by keeping logistics predictable and lead times manageable. 

Because YDAM inherits its lineage from the YVAM magnetic‑bearing centrifugal chiller, it benefits from a proven platform that industry watchers have recognized for efficiency and water‑free operation – important markers for uptime, TCO and sustainability reporting.

YDAM product features (at‑a‑glance)

When you evaluate options for multistory or land‑constrained sites, the following YORK® YDAM attributes are the ones to highlight in a design narrative.

• Up to 3.5 MW of cooling per unit, enabling up to 20% higher capacity density* versus other available solutions – fewer units for the same megawatts
• Air‑cooled, magnetic‑bearing centrifugal architecture derived from the YVAM platform, recognized for efficiency and zero water consumption
• Compact form factor that fits a 53‑foot standard flatbed trailer to simplify shipping, rigging and lifting logistics
• Warm‑water compatibility supports ~45 °C chilled‑fluid setpoints for modern GPU inference and training loads
• Wide temperature‑difference capability, enabling smaller pumps and lower pumping energy, with downstream CapEx/OpEx savings potential
• Deployment efficiency: the capacity and reduced footprint could allow operators to halve chiller counts on certain sites, improving schedules and addressing skilled‑labor constraints

Designing around density: guidance for project teams

1) Start with the roof map
Instead of sizing on nameplate alone, plot MW per rooftop square foot and run alternative layouts that compare unit count, service clearances and walkway codes. If YDAM’s per‑unit capacity reduces array count, you may free up space for redundant feeders, battery enclosures, or additional free‑cooling coils – each of which can influence reliability and PUE in different climates.

2) Align to GPU‑era temperature programs
If your white space is migrating to liquid‑cooled accelerators or high‑T rack loops, validate that your chilled‑fluid setpoints and strategies match YDAM’s warm‑water capabilities. Leveraging higher return temperatures can reduce primary/secondary pump horsepower and pipe size to shift both CapEx and OpEx in your favor.

3) Treat logistics as a cost line – because it is
A machine that rides a standard flatbed reduces exposure to specialized transport, oversize permitting and multi‑day crane windows. Model that explicitly in your total‐installed cost and schedule risk analyses; it’s often the unmodeled soft costs that derail fast‑track programs.

4) Plan labor around fewer, larger units
If YDAM’s density allows you to cut machine count, think through the staffing model for installation and commissioning. Fewer units can mean fewer parallel work fronts, tighter QA/QC, and more predictable energization sequences – useful advantages when skilled labor availability is a constraint.

5) Prioritize environmental stewardship.
Air cooled solutions like YORK® YDAM eliminate the need for process water by design, supporting responsible water use and aligning with community focused environmental goals. By avoiding cooling towers, YDAM simplifies permitting and reduces concerns around water chemistry, drift, and visible plumes—key considerations for urban and suburban sites. When paired with free cooling strategies where climate permits, YDAM arrays can further improve annualized efficiency and PUE while minimizing environmental impact on surrounding communities.

What this means for the next build cycle

The market signal in the Johnson Controls announcement is straightforward: multi-megawatt; high-density chilling can now be delivered in air-cooled, magnetic-bearing packages sized and shaped for vertical campuses. For developers, that opens a route to compress schedules, simplify logistics and scale MW per roof square foot without introducing tower water into the equation. For operators, it offers a way to standardize thermal blocks in global rollouts where water constraints and permitting timelines vary widely from city to city.

It’s worth noting that Johnson Controls is positioning YDAM not as a moonshot, but as the next step in a platform continuum. By building on the YVAM lineage and aiming for late-2026 shipments, the company is signaling that supply chain, testing and manufacturability are aligned to near-term demand curves – a practical consideration for programs that must place equipment orders months in advance to hold utility deliverables and tenant commitments. Industry coverage reflects the same emphasis on capacity density, warm-water GPU compatibility, and logistics advantages. This underscores market interest in densifying chilled-water plant layouts for taller buildings.

The takeaway

In an era when every rooftop square foot counts, YORK® YDAM reframes the trade space. It empowers 3.5 MW‑class cooling. It delivers air‑cooled and water‑free magnetic‑bearing efficiency. It’s made with a transport‑ready footprint built for multistory sites. If your next project must thread the needle between density, speed and sustainability, this is an option to model early – and a baseline to pressure‑test the rest of your plant narrative against.

*Performance results, including higher capacity density, are based on several factors, including but not limited to system configurations, operating temperatures, site conditions, and maintenance routines. Actual outcomes may vary and are not guaranteed.

FAQs

What is the YORK® YDAM chiller designed for?
YORK® YDAM is designed for multistory and space constrained data centers that require high cooling capacity per unit, simplified logistics and air cooled, water free operation.

How does YDAM support high density AI and GPU workloads?
Yes. YDAM supports warm water cooling profiles aligned with modern inference and training environments, helping improve efficiency and system performance under high density load conditions.

How does YDAM support sustainability goals?
As an air cooled, magnetic bearing chiller, YDAM uses zero process water and offers high efficiency across a wide operating range, supporting water stewardship and energy reduction initiatives.