Rear Door Heat Exchanger and CDU Liquid Cooling Application Analysis

Capture 80-100% of Cabinet Heat at the Rear Door: RDHx and CDUs Unlock Air-Cooled Room Upgrades

Rear Door Heat Exchangers (RDHx) capture 80-100% of cabinet heat load, delivering 40-70% higher heat removal efficiency than room air conditioners, with pPUE optimized to 1.05-1.15 and rack loads up to 100kW—without infrastructure reconstruction. Ideal for air-cooled room upgrades, GPU clusters, edge and container deployments, RDHx works alongside rack-mounted air-liquid CDUs, which cut reconstruction investment by 30-50%, and liquid-liquid CDUs handling 80-120kW racks with over 95% efficiency. With half of AI servers adopting liquid cooling by 2026, diversified products will drive industry-wide renovation. EXTRCOOL offers dual-mode CDUs, manifold assemblies, cold plates, rear-door heat exchangers, dry coolers and containerized systems.

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Area 51, NV, USA

EXTRCOOL INDUSTRY LIMITED

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The CDU, the Heart and Brain Liquid Cooling Cannot Do Without

Silent When Healthy, Fatal When Failing: The Five Selection Questions That Decide Whether the CDU Holds the Loop Together

The CDU plays the role the heart plays: it produces no cold, but without it the coolant never moves. Its heart role pumps and distributes via the manifold, while its brain role senses and controls. Selection answers five questions: total flow above all cold plate minimums, head above maximum loop resistance, exchanger capacity above peak load with fouling margin, redunda...

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The Manifold That Decides Where the Coolant Goes

From CDU to Cold Plate and Back: How the Manifold's Flow Distribution, Not Total Flow, Decides Precision Cooling

Rising AI GPU power is moving liquid cooling from whether it can cool to cooling precisely, and the manifold decides whether coolant reaches every position as it should. It distributes coolant through main channels to parallel branches and collects the heated return, following CDU to supply manifold to cold plate to return manifold to CDU. Poor design lets near-end branc...

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How a Liquid Cooling Manifold Gets Made, from Material to Final Acceptance

316L to Helium Testing: The Four Links—Material, Machining, Cleanliness and Verification—That Decide Manifold Quality

Manifold manufacturing starts with material, and 316L is the safer default, with coolant compatibility outweighing thermal conductivity. CNC machining forms main channels, branches and interface holes, where holding channel positions matters more than drilling; one-piece machining avoids weld deformation, while tube and plate assemblies add laser, TIG or brazing. Deburri...

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water cooling system

finned tube heat exchanger

RDHX

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