Miraito One Installs Japan's First Delta Electronics LTA CDU-Equipped Liquid-Cooled Container Data Center at Shin-Kiba Facility

Miraito One Co., Ltd. (Headquarters: Minato-ku, Tokyo; President & CEO: Hideo Sugawara; hereinafter 'Miraito One') has installed the first commercial unit of a '20ft liquid-cooled container data center (hereinafter 'this liquid-cooled container DC') equipped with Delta Electronics' LTA CDU (commonly known as AALC) at its Shin-Kiba building. This installation, conducted with the cooperation of Delta Electronics Co., Ltd. (Headquarters: Minato-ku, Tokyo; President & CEO: Chien-Hao Hua), supports verification of high-performance GPU server deployment at the MM Advanced Innovation Lab. This marks the first installation in Japan of a data center equipped with Delta Electronics' LTA CDU.

With the accelerating digital transformation and widespread adoption of generative AI, demand for data centers is expected to grow significantly. However, as GPUs become increasingly powerful, traditional air-cooling methods are no longer sufficient for effective thermal management, making the transition to liquid cooling essential. While AALC, one of the liquid cooling technologies, is rapidly gaining traction in the U.S. and other regions, its adoption in Japan remains limited.

AALC is an advanced DLC (Direct Liquid Cooling) technology that uses air-conditioning systems to cool the liquid coolant. Due to its compact footprint, it was selected for integration into this liquid-cooled container DC. A key advantage is its ease of deployment—since extensive liquid piping infrastructure is not required, it can leverage existing HVAC systems to enable liquid cooling, reducing installation complexity and cost.

This liquid-cooled container DC will serve as a demonstration facility to support next-generation infrastructure. Moving forward, Miraito One plans to utilize high-performance GPU servers and IOWN technology, aiming for full operation from September 2026. Commercial sales domestically and internationally are also planned.

Details on the liquid-cooled container DC, including product description and use cases, are as follows:

*1 First domestic installation: based on internal research

*2 MM Advanced Innovation Lab: A joint research, development, and testing laboratory established by Miraito One and Morgentrot at the Miraito One Shin-Kiba building on March 18, 2025. The lab aims to create next-generation container data centers with world-class safety, environmental performance, and computing power, addressing emerging challenges and customer needs.

*3 LTA CDU (Liquid-to-Air Coolant Distribution Unit): An advanced cooling technology that directly cools high-performance, high-heat-generating GPUs in data center server racks using liquid, then re-cools the heated liquid via an internal heat exchanger. Commonly referred to as AALC (Air Assisted Liquid Cooling).

*4 DLC (Direct Liquid Cooling): A cooling method that directly cools high-performance, high-heat GPUs in server racks using liquid. The need for new liquid piping infrastructure and dedicated heat source equipment presents a barrier to integrating such GPUs into existing air-cooled data centers.

Details:

Liquid-Cooled Container Data Center Equipped with Delta Electronics LTA CDU

● Product Description

- No external liquid cooling pipes or cooling equipment are required outside the container. The system uses only outdoor air conditioning units, enabling installation even in confined spaces.

- The prefabricated container is delivered and installed on-site, with commissioning completed simply by connecting power, significantly shortening construction time and reducing human error during installation.

- High-efficiency liquid-cooled GPUs achieve substantial energy and CO2 savings per unit of computing power compared to traditional air-cooled GPUs, enabling enterprises to simultaneously address decarbonization goals and improve business viability.

Delta Electronics LTA CDU, GoCool-80, Liquid-to-Air Coolant Distribution Unit, GoCool-80

● Use Cases

- Enterprise organizations planning to build on-premises private cloud environments using AALC liquid-cooled container data centers on small surplus plots within their premises, leveraging excess power to process highly confidential data that cannot be uploaded to the cloud, and using AI agents to streamline back-office operations.

- Logistics warehouse operators and solar power plant operators planning to utilize curtailed electricity—such as from rooftop solar installations or remote solar farms—by converting it into computing power via high-efficiency GPUs in AALC liquid-cooled container data centers installed on small surplus plots, thereby reducing lost revenue and enhancing business profitability.

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About Miraito One Co., Ltd. Miraito One, founded in 1946, is an infrastructure company with nearly 80 years of history, dedicated to building and maintaining critical infrastructure. Leveraging extensive experience and technical expertise from its legacy in telecommunications infrastructure, the company now extends its capabilities to energy and transportation sectors. By integrating expertise in communications, electrical, architectural, and civil engineering, Miraito One contributes to smart city development, regional DX initiatives, and green energy adoption. Guided by its purpose—"Co-creating an exciting future through technology and challenge"—the company aims to create new value that enriches people's lives and realizes a sustainable society.

About Delta Electronics Co., Ltd. Delta Electronics Co., Ltd. is the Japanese subsidiary of the Delta Group. The Delta Group, founded in Taiwan in 1971, is a global leader in switching power supplies and cooling fans. It provides a wide range of products and solutions, including power management systems, electronic components, displays, factory automation, networking equipment, and renewable energy solutions. With business and manufacturing sites across the world, the group continues to expand its global footprint.