Equinix installs Honeywell thermal buffer at Ashburn facility

Equinix has tested and installed Honeywell Aerospace's Thermal Response Module at its Co-Innovation Facility in Ashburn, Virginia, the companies said. The module is designed to stabilise coolant temperatures during power disturbances and rapid changes in GPU demand.

What the module does inside the loop

The unit sits between the coolant distribution unit and the servers. It uses proprietary phase-change materials to store and release thermal energy when the loop needs it. Honeywell says it stabilises a cooling loop within seconds and can be configured to provide several minutes of thermal buffering.

Honeywell describes the unit as a drop-in that fits existing loops without a redesign and says it is compatible with different coolant distribution unit vendors and architectures. The company says the module aims to reduce temperature excursions and lower the risk of damage to high-value computing equipment.

Why liquid loops need a buffer at all

A brief power dip or a sudden swing in GPU demand can force throttling on high-value computing equipment. Five years ago, a typical enterprise rack drew 5 to 15 kW. AI racks now commonly run at 80 to 150 kW, Business Reporter notes in an article sponsored by Delta Electronics, and next-generation platforms are expected to approach 250 kW per rack.

Direct-to-chip cooling is becoming increasingly important in AI-optimized environments, according to Data Center Knowledge. Liquid runs through cold plates on the processors, removing heat close to the source. That makes stable flow and temperature across the loop essential.

Even inside liquid-cooled AI racks, current high-density servers still rely on air cooling for part of their thermal load, so operators must manage both.

Adoption still has room to run. Honeywell, citing Omdia, says fewer than half of data centres deploy some form of liquid cooling. The same Omdia figures point to 20% annual growth over the next five years.

What Equinix tested, and what is still unanswered

"Testing at our Ashburn Co-Innovation Facility demonstrated the technology's capability to manage rapid GPU cooling load fluctuations while requiring a smaller footprint in comparison to buffer tanks," said Pawel Wlodarczak, design innovation director for global design at Equinix.

Rich DeGraff, president and CEO of Control Systems for Honeywell Aerospace, said AI thermal demands pose a comparable challenge to protecting mission-critical systems. Honeywell adapted the technology from aerospace and defence work.

Honeywell did not disclose commercial deployment numbers, contract value or a wider rollout schedule beyond the Ashburn installation.