Treating coolant as an asset: Why CIOs should optimise direct-to-chip cooling now 

Expert opinion from Ecolab

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The rush to harness artificial intelligence is changing the economics and engineering of the data centre. Higher rack power densities mean more compute per rack, but they also mean more heat generated, closer to the chips. It’s a clear indicator that direct-to-chip (D2C) liquid cooling is no longer a fringe option: it is a practical way to enable greater density, reduce energy consumption, and protect long-term availability. For CIOs and technology leaders, the question is no longer “if” liquid cooling should be considered, but “how” to deploy it in a way that controls risk, supports SLAs, and advances sustainability objectives, whether those are regulatory requirements or ESG goals. This article draws on field experience from recent deployments and operator feedback to set out a pragmatic framework for executive decision-makers. Rob Lowe Director, RD&E II – Global High Tech at Ecolab outlines the design choices, commissioning disciplines and operational practices that turn D2C from a promising technology into a predictable, business-grade capability. 

Why D2C matters to CIOs 

Air cooling has served data centres well for decades, but its limitations are beginning to come to the fore. Once rack densities cross certain thresholds, moving more air becomes inefficient or simply impossible. D2C systems place coolant directly at the point of heat generation, which improves thermal transfer and can reduce the load on room-level chillers. For those in the executive office, that translates into three measurable outcomes: 

• Increased usable capacity per site, deferring costly expansion or new builds. 
• Improved energy efficiency at high density, supporting corporate commitments on carbon and energy intensity. 
• A tighter margin on reliability risk: higher density carries higher impact from a single rack failure, so prevention and predictability become business priorities. 

These are business metrics senior management teams understand: revenue-constrained capacity, operational expense control and reputational risk.  

Design and pre-commissioning: Get it right first time 

Much of the risk associated with D2C deployment is avoidable and typically stems from construction and commissioning missteps. Narrow cold-plate passages and complex manifolds tolerate almost no particulates, and materials choices interact with fluid chemistry in ways that can accelerate corrosion or deposits if not validated. 

From a governance perspective, the following is required of design and delivery teams: 

 • Clean-by-design. Specify accessible sample ports, drain points and valve arrangements so that flushing and future service are straightforward. 
• Defined procedure water and acceptance criteria. Before any IT gear is installed, require a documented commissioning protocol (hydrotest → staged filtration → flush → verification) with measurable turbidity, conductivity and particulate targets. 
• Materials compatibility review. Ensure seals, brazes and coatings are validated against the intended coolant chemistry and operating temperatures. 

These steps add modest upfront cost but save significant downstream expense. That’s why it’s important to insist that commissioning checklists become contract deliverables and acceptance gates are tied to vendor payment milestones. 

Operationalising coolant as an asset 

An operator’s traditional mindset is to set the loop and check it once a quarter, but unfortunately, that doesn’t suit D2C. Coolant health is an operational metric as important as temperature, humidity, or power draw. That requires both process and instrumentation: 

• Treat coolant like process water. Build routine sampling, record keeping and playbooks for remediation into operations runbooks. 
• Instrument strategically. Install sample ports, turbidity checks, conductivity and glycol concentration measurement points during commissioning. These are the data sources that let you know whether fluid chemistry is trending towards risk. 
• Define action thresholds and response SLAs. It is not enough to flag an out-of-spec value; operators need pre-agreed remediation steps and service windows to restore margin before an outage becomes likely. 

From a CFO’s perspective, this approach replaces episodic risk with predictable, insurable operational cost: fewer emergency interventions, lower incidence of hardware rework and more reliable uptime. 

The role of real-time telemetry and analytics 

Executives increasingly ask whether monitoring can be automated and whether analytics can predict failures. Real-time telemetry can turn intermittent lab checks into continuous insight. Streaming basic coolant parameters (pH, conductivity, temperature, turbidity and glycol concentration) to an operational dashboard enables early detection of trends and transient events that lab sampling can miss. 

For CIOs, the combination of telemetry and analytics delivers three practical advantages: 

1. Predictability — Forecast when an intervention is needed and schedule it during maintenance windows. 

2. Efficiency — Target interventions precisely, reducing unnecessary flushes or preventive replacements. 

3. Evidence — Create auditable records for regulators, customers and internal ESG reporting. 

Telemetry is an enabler, not a substitute for engineering discipline. It should be implemented to augment a rigorous commissioning baseline and to feed decision processes rather than to excuse lax procedures. 

Cooling-as-a-Service (CaaS): A pragmatic operational model 

Many organisations will find value in engaging third-party expertise under a Cooling-as-a- Service (CaaS) model. CaaS shifts responsibility for fluid health, monitoring and life cycle care to a specialist provider, while the operator retains control over SLAs and integration. For executives evaluating this route, be explicit about what the service covers: commissioning support, continuous monitoring, on-call remediation, wastewater handling and compliance reporting are common line items. 

CaaS can accelerate adoption, reduce hiring of niche skills and convert an unfamiliar risk into a contractually managed outcome. However, contract clarity is essential; ensure responsibilities and escalation paths are unambiguous and demand performance metrics that align with business goals. 

Standards, collaboration and the path to scale 

The D2C market is still maturing and lacks universal standards. Industry collaboration is therefore critical. Operators should look for partners who are active in workstreams and standards bodies working to codify commissioning and operational practices – for example, those contributing to Open Compute Project guidance and relevant ASHRAE discussions. Standards reduce vendor lock-in, de-risk procurement and help standardise acceptance criteria across sites. 

What CIOs can ask for next 

If you are evaluating D2C, start with a pilot but set commercial and technical expectations up front. Demand the following from vendors and integrators: 

 • A documented pre-commissioning plan with measurable acceptance criteria. 
• A telemetry roadmap showing what will be instrumented and how data will be integrated into DCIM/BMS. 
• A life cycle cost model comparing total cost of ownership (including commissioning and maintenance) against air-cooled alternatives at projected density. 
• Wastewater and environmental handling plans that meet local regulatory needs. 

Conclusion: Time to translate engineering rigor into business outcomes 

Direct-to-chip cooling offers CIOs a powerful lever: it enables higher rack density and better energy performance, but only if it is managed as an operational discipline. That means design rigour, transparent commissioning, continuous telemetry and a clear commercial model for ongoing care. By treating coolant health as a business metric – and by insisting on auditable, repeatable practices – technology leaders can unlock AI-driven growth while protecting uptime, controlling costs and meeting sustainability commitments.