Accelsius used NVIDIA GTC 2026 to introduce the NeuCool IR150, an integrated rack built around two-phase, direct-to-chip liquid cooling for high-density AI and HPC deployments. The company rates the system for up to 150 kW of cooling capacity in a single, pre-integrated enclosure.
The NeuCool IR150 combines a two-phase coolant distribution unit (CDU), 42U of IT rack space, and built-in liquid and vapor manifolds inside an 800 mm-wide rack. Accelsius said the rack allocates 200 mm to cooling infrastructure and 600 mm to server space, aiming for a rack that can be deployed as a single unit rather than assembled from separate CDUs, manifolds, and rack hardware on-site.
For operators, the interesting part isn’t the 150 kW headline number—it’s the packaging. Pulling the CDU and distribution into the enclosure can reduce mechanical integration work during deployment and can keep the cooling “failure domain” contained to a single rack, which changes how you think about maintenance windows and sparing compared with shared, row-based CDUs.
Accelsius also called out warm-water operation: the IR150 is designed to be ASHRAE W45 compatible and to support facility water temperatures up to 45°C. If the system performs as described in the field, that design target matters because higher facility-water temperatures can expand free-cooling opportunities and reduce dependency on colder-water plant operation.
Accelsius’ two-phase approach uses a non-conductive dielectric refrigerant, which the company described as having an A1 safety rating and low global warming potential. The company emphasized that no water enters the IT rack. It contrasted that with single-phase direct-to-chip systems that circulate treated water to the chip, citing leak risk, corrosion concerns, and ongoing water-quality maintenance as operational considerations.
On serviceability, Accelsius said the IR150 is designed with hot-swappable components, including pumps, power supply units, sensors, the main control board, and an LCD display, with the goal of servicing those parts without taking the rack offline.
“The IR150 represents the next evolution of data center infrastructure,” said Josh Claman, CEO of Accelsius.
The IR150 joins other NeuCool products Accelsius referenced: the NeuCool MR250, a row-based CDU the company said delivers up to 250 kW+ of cooling capacity per rack, and the NeuCool Thermal Simulation Rack (TSR), which it described as a thermal test platform.
Source: Accelsius
