The CDU, the Heart of Liquid Cooling Infrastructure

TIM Decides Whether Heat Leaves, Cold Plate How It Is Absorbed, CDU Whether the System Runs: The Node Every Route Cannot Skip

The CDU is moving from auxiliary data center equipment to a core node of liquid cooling infrastructure: it does not cool directly, but coolant circulation, pressure control, flow regulation, temperature management and heat exchange all pass through it, so the TIM decides whether heat leaves, the cold plate how heat is absorbed, and the CDU whether the system runs stably. AI server power pushes CDUs toward megawatt-class units supporting 1 to 5 megawatts of heat rejection, and the global market grows from about 1.6 billion dollars in 2025 toward 7 billion by 2033 at a compound rate above 21 percent. EXTRCOOL provides one-stop liquid cooling solutions.

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Area 51, NV, USA

EXTRCOOL INDUSTRY LIMITED

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CDU Commissioning, From Four Measurement Points to the Temperature Budget

P-in 25, S-out 30, Target 28: Why the 5-Degree Approach Exceeds a 3-Degree Budget and Where the Heat Balance Breaks

CDU commissioning starts from four measurement points: P-in for facility water entering as the primary cold inlet, P-out as the primary hot outlet, S-in for server return as the secondary hot inlet, and S-out leaving toward the servers, with the approach temperature defined as S-out minus P-in. With the primary inlet at 25 and supply at 30 against a target of 28, the app...

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800VDC Reshapes the CDU, One Booth for Power, Backup and Cooling

1MW Rack, 1/15 Current, 1/225 Line Loss: The 800-Volt Rewrite That Folds CDU, Power Shelf and 5000A Busbar Into One Booth

An 800VDC white paper is rewriting the cabinet: moving a megawatt rack from 54 to 800 volts cuts the current to roughly one fifteenth and line loss to one two-hundred-twenty-fifth, against 200 kilograms of copper busbar and a power shelf eating 64U at low voltage, and the CDU rewrite lands on the input, a 2.5-megawatt liquid-to-liquid unit carrying 800VDC with three hot-...

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CDU Selection, Decisions That Shape the Next Decade

Centralized vs Distributed, 105-110% Capacity and a 2-8°C LMTD: The CDU Decisions That Decide Fault Radius and Availability

CDU selection starts with centralized versus distributed: centralized units sit outside the cabinets with secondary piping and must hold rack-to-rack flow variation within 10 percent, widening the blast radius, while distributed units ride inside each cabinet and confine faults to one rack. Design capacity runs 105 to 110 percent of the calculated load on the liquid-cool...

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