The table categorizes the key metrics required to safely manage a Coolant Distribution Unit (CDU) and its secondary cooling loop using a 25% Propylene Glycol (PG25) mixture into two main sections:
- Real-time Monitoring: This section focuses on physical states that require immediate attention. It includes Temperature (ΔT), Pressure Drop (ΔP), Flow Rate, Leak Detection, and Conductivity.
- Example: It highlights that a leak at the rack or joints poses a risk of IT short circuits and fire, dictating immediate actions such as triggering the Emergency Power Off (EPO) and shutting off the loop valves.
- Periodic Maintenance: This section covers the chemical and biological fluid quality checks that must be performed regularly. It sets targets for PG Concentration (25% ± 2%), pH Level (7.5 ~ 9.0), Corrosion Inhibitor, Microbes (< 1,000 CFU/ml), and Turbidity/Filtration (< 50 μm).
- Example: To mitigate the risk of biofilms clogging the tightly packed microchannels, it advises taking actions like biocide shock dosing or checking the UV sterilization system.
📌 Summary
This document is a practical, structured matrix designed for data center operators. It explicitly outlines the essential operational telemetry, potential hardware and fluid risks, and precise mitigation actions needed to maintain a reliable and highly efficient liquid cooling infrastructure.
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