All eyes on Products Engineering Hub for Data Center Cooling in Tokyo!

We are proud to have been part of the recent opening ceremony for NTT Facilities' groundbreaking "Products Engineering Hub for Data Center Cooling" in Musashino, Tokyo. This environment is designed to verify the performance of the diverse cooling solutions for hyperscale data centers—including both chiller-based and chiller-less liquid cooling systems. It also serves as a platform for troubleshooting issues in active data center operations and for the training of service engineers. The Engineering Hub launched its operation in April 2025 and in May 2025 also opened its doors as a showroom, welcoming data center vendors, MEP consultants, and construction firms involved in data centre development. Visitors will have the opportunity to explore a broad catalogue of cooling solutions from STULZ and observe their real-time operation in an active environment. Not in Tokyo? No problem — this article will take you on a virtual tour of the facility, giving you a closer look at its key features and innovations.

Data Hall Area

The Data Hall Area features server racks equipped with the dummy load bank (420 kW for air-cooled and 360kW for liquid cooling). These loads enable liquid cooling simulation through a coolant supplied from the CDU, as well as air-cooled simulation through various airflow systems. Here you can find "SKID-type CDU" designed for small-scale generative AI data centers. On the back part of the unit, the STULZ Rear door heat exchangers remove the residual heat from GPU servers with a higher workload. To further enhance safety, the data hall is equipped with a leak detection system from STULZ, utilizing sensor cables to provide early warning of potential liquid leaks.

Mechanical Corridor Area

Mechanical Corridor Area houses various STULZ cooling products as “Chilled Water Downflow CRAH”, “Chilled Water Fan Wall”, “Chilled Water Custom AHU Top Return”, Chilled Water Custom AHU with Air-side Economizer. Here one can also find a large, custom-designed Coolant Distribution Unit (CDU), developed in collaboration between NTT Facilities and STULZ GmbH. It is tailored specifically for the Japanese market's next-generation data centres. The unit features front-only maintenance access, unlike traditional models that require clearance on both sides. This feature enables CDUs to be installed in a high-density layout along mechanical corridor walls, significantly improving space efficiency in hyperscale data center environments.

From left to right: Chilled Water AHU with air-side economizer, Chilled Water Custom AHU top return,

Chilled Water downflow CRAH, Chilled Water Fan Wall, and Large capacity CDUs (front only maintenance type).

Learning Area

A dedicated “Learning Area” has also been established to provide hands-on training for service engineers and fostering collaboration with data center vendors.

STULZ sincerely appreciate the opportunity to work along with NTT Facilities on this groundbreaking project. This partnership reflects our mutual dedication to advancing liquid cooling technologies that support sustainable, high-performance AI infrastructure. Together, we look forward to driving the next generation of cooling innovation!