11 Aug 2026
AI Liquid Cooling Evolves: The Manifold’s Role Is Changing
2026 OCP Note 1 APAC Summit takes place in Taipei on August 11–12 under this year's theme, "Leading the Future of AI." Based on the event themes and technical categories published by OCP, the development of AI data centers is expanding beyond chips to include rack-level cooling, power distribution, and data center facilities, with Cooling Environments also identified as one of the key technical areas. This suggests that the liquid cooling market is gradually moving beyond individual cold plates or CDUs Note 4 toward more integrated rack Note 2 infrastructure.
As AI servers continue to increase in power density, thermal management is no longer simply a matter of whether a cold plate can remove enough heat. After coolant leaves the CDU, it must travel through piping, a manifold Note 5 and quick-disconnect couplings before being distributed to individual server trays. OCP's Cold Plate Note 3 Sub-Project also includes manifolds, QDs Note 6 and CDUs within the scope of the Technology Cooling System, while promoting greater standardization of interfaces used in direct liquid cooling systems.
A simple way to visualize a liquid cooling system is to think of it as a road network, with the manifold acting as a "distribution hub." It directs coolant from the main loop to different servers and then collects the warmed coolant for return to the system. For this reason, the key question is not simply "How many outlets does it have?" It also matters whether each branch receives the appropriate flow rate and whether pressure drop Note 7 , sealing performance, and material integrity can remain stable throughout operation.
As these components become increasingly specialized, manifold suppliers may eventually be expected to provide more than dimensions, materials, and interface specifications. Engineering data may also include flow-versus-pressure-drop curves, branch flow distribution, working/proof/burst pressure, leakage performance, coolant compatibility, wetted materials Note 8 , UQD interfaces, operating temperature ranges, and cleanliness Note 9 requirements.
It is important to clarify that these items are not an OCP-mandated certification checklist for manifolds. Rather, they represent engineering and commercial considerations inferred from the broader development of rack-level liquid cooling integration, standardized interfaces, and system reliability. OCP currently identifies topics including Technology Cooling Systems, CDUs, Cooling Loops and Connectors, Cooling Reliability, and Leak Management.
For component suppliers, this is also an area where liquid cooling manifold capabilities may be worth preparing in advance. A product must not only be manufacturable; suppliers may increasingly need engineering data that explains how the manifold performs within the overall system. As flow rate, pressure drop, pressure resistance, materials, and cleanliness become more measurable and clearly documented, the manifold may evolve from a conventional piping component into an integral part of rack-level thermal infrastructure.
Technical Term Notes
1. OCP (Open Compute Project)
An industry-driven initiative that promotes open standards for data center infrastructure, including hardware, servers, racks, power systems, and cooling technologies.
2. Rack | Server Rack
A standardized enclosure or structural frame used to house servers, networking equipment, power distribution equipment, and cooling systems.
3. Cold Plate
A liquid cooling component placed in direct thermal contact with high-heat components such as CPUs and GPUs, allowing circulating coolant to absorb and carry away heat.
4. CDU (Coolant Distribution Unit)
A unit used to manage, circulate, and distribute coolant within a liquid cooling system.
5. Manifold | Liquid Cooling Manifold
A fluid distribution component that delivers coolant from the main loop to multiple server trays and collects the return coolant before routing it back into the cooling system.
6. QD / UQD (Quick Disconnect / Universal Quick Disconnect)
Quick-connect couplings designed to enable fast connection, disconnection, and servicing of liquid cooling lines.
7. Pressure Drop
The loss of fluid pressure as coolant flows through piping, fittings, or other components. It is an important parameter when determining system flow requirements and pump capacity.
8. Wetted Materials
The metals, plastics, seals, and other materials that come into direct contact with the coolant inside the liquid cooling system.
9. Cleanliness
The control of metal particles, machining debris, oil residues, and other contaminants inside liquid cooling components that could affect system performance or reliability.
References
1. Open Compute Project — 2026 OCP APAC Summit: Theme
2. Open Compute Project — 2026 OCP APAC Summit: Call for Presentations
3. Open Compute Project — Cold Plate Sub-Project
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