Topic
Liquid Cooling_
Liquid cooling has transitioned from a niche technology to a baseline requirement for AI data centers. NVIDIA’s GB200 and GB300 NVL72 systems require 100% liquid cooling — there is no air-cooled option. At 120+ kW per rack, the heat density of modern GPU systems exceeds what air cooling can physically remove. Direct liquid cooling (DLC) using cold plates and coolant distribution units (CDUs) is now the standard for any facility deploying Blackwell-generation hardware.
Leviathan Systems Scope_
Leviathan Systems installs liquid cooling infrastructure including CDU placement and connection, rack-level manifold routing, quick-disconnect fittings, leak detection systems, and integration with facility water loops or dry coolers.
Articles_
Warm-Water Cooling for GPU Clusters: Why Hotter Water WinsDetails the engineering steps for deploying warm-water liquid cooling loops on H100-GB300 racks, including manifold routing, CDU setpoints, and verification that raise facility water supply temperature to enable cooling-tower free cooling and heat recovery while eliminating condensation risk.Two-Phase vs Single-Phase Direct Liquid Cooling for GPUsDetails field procedures for deploying and maintaining single-phase versus two-phase direct liquid cooling on H100 through GB300-class GPU racks, including manifold routing, leak testing, and failure isolation steps used by crews performing rack assembly and commissioning.Rear-Door Heat Exchangers vs Direct Liquid Cooling: Choosing Your Path to High DensityCompares rear-door heat exchangers against direct-to-chip liquid cooling for GPU racks at H100 through GB300 NVL72 densities, with concrete decision criteria based on power, piping paths, and commissioning steps that Leviathan Systems crews apply in the field.Manifolds & Quick-Disconnects in DLC: Field Handling Without DripsDetails field procedures for installing and servicing in-rack coolant manifolds, dripless quick-disconnects, and GPU cold plates in direct liquid cooling loops on H100 through GB300-class systems, with emphasis on sequence, inspection, and leak prevention.Facility Water Loop Design for AI Halls: TCS to FWS Done RightThis article specifies the design sequence, parameters, and verification steps for facility water systems feeding CDUs in AI halls, including temperature and flow matching, water treatment, tie-in geometry, and field testing that prevents CDU trips during GPU rack commissioning.Coolant Chemistry & Maintenance for Direct Liquid CoolingSpecifies the chemistry, treatment, sampling, and maintenance steps for PG25-based direct liquid cooling loops on GPU racks, including when to choose PG25 over water and how to keep loops free of fouling and corrosion.Condensation & Dew-Point Control in Liquid-Cooled GPU HallsDetails the engineering steps, sensor placements, and control logic required to keep liquid-coolant supply temperatures above hall dew point in NVL72-class deployments, showing why warm-water loops reduce condensation risk without secondary chillers.How to Size a CDU for a GPU Cluster: Heat Load, Flow, Approach TempShows field engineers how to translate measured rack kW into CDU kW rating, secondary-loop flow, and approach-temperature margin so the selected unit matches actual heat rejection without excess stranded capacity.Direct-to-Chip vs Immersion Liquid Cooling for GPU Data CentersA practical, field-tested comparison of direct-to-chip (cold plate) and immersion liquid cooling for AI GPU clusters, covering deployment workflows, thermal performance, maintenance, and failure modes—written for data-center operators and deployment engineers who build and commission these systems.Liquid Cooling vs Air Cooling in the Data Center: When the Crossover HappensThis article provides a definitive, field-tested guide for data-center operators and deployment engineers on the exact GPU power-density threshold where air cooling becomes infeasible and direct-to-chip liquid cooling becomes mandatory, based on real-world rack assembly and commissioning experience at Leviathan Systems.Air-to-Liquid Cooling Retrofit: The Install SideA step-by-step field guide for converting an air-cooled GPU data center hall to liquid cooling, covering the physical retrofit sequence, infrastructure prerequisites, and common pitfalls, written for deployment engineers and operators.Rear-Door Heat Exchanger (RDHx) Install & Facility Water Tie-InA step-by-step field guide for installing rear-door heat exchangers on GPU racks and tying them into facility water loops, covering mechanical mounting, water connections, condensation prevention, and commissioning tests.Coolant Distribution Unit (CDU) Installation & CommissioningA field-proven, step-by-step guide to installing and commissioning a Coolant Distribution Unit (CDU) in an AI data center, covering flow balancing, temperature setpoints, redundancy configurations, and the baseline checks that prevent leaks and thermal events.Liquid-Cooling Loop Commissioning for GB200 & GB300 NVL72: Flush, Fill, Leak-Test, AcceptThe field procedure for commissioning a direct-to-chip liquid-cooling loop on a GB200/GB300 NVL72 rack — flush, fill and air purge, pressure and leak testing, coolant acceptance criteria, and CDU startup — with the thresholds that count as a pass.
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