The International Energy Agency projects U.S. data center power demand will triple from 2024 levels by 2030. Global electricity consumption by data centers is on track to exceed 950 terawatt-hours annually, up from approximately 450 terawatt-hours in 2024. The facilities being built today to serve AI workloads are no longer the temperature-controlled IT closets of two decades ago. They are industrial processes: high-density liquid cooling loops, precision chemistry control, continuous flow monitoring across dozens of distribution branches. Cory Marcon and Lauton Rushford, writing in POWER Magazine, make the case that the instrumentation layer most data centers are running is not matched to that industrial reality, and the efficiency gap is measurable in kilowatt-hours and dollars.
The specific technology they identify is zero-diameter, or 0xDN, electromagnetic flow measurement. Traditional electromagnetic flowmeters require 5 to 10 pipe diameters of straight piping both upstream and downstream of the measurement point to produce accurate readings. In a densely packed liquid cooling plant where CDUs, manifolds, pumps, and distribution headers are packed into limited mechanical space, finding 10 pipe diameters of clear run is frequently impossible. The result is that operators either install flowmeters where they fit rather than where the measurement is most useful, or they skip flow monitoring in branches where the geometry does not cooperate. Zero-diameter electromagnetic flowmeters produce accurate measurements immediately downstream of a 90-degree elbow, a pump, or a control valve. The installation constraint disappears, and operators can instrument the full cooling distribution network rather than the portions where the plumbing cooperates.
The companion technology is clamp-on surface temperature sensing, which eliminates thermowells entirely. A thermowell penetrates the pipe wall and extends into the process fluid to take temperature readings. Every thermowell is a potential leak point, a pressure drop contributor that makes the pump work harder, and an installation that requires either draining the loop or hot-tapping under pressure. In a liquid cooling circuit where the fluid is a water-glycol mixture circulating through servers under pressure, reducing the number of pipe penetrations reduces both the leak risk and the maintenance burden over a 10-year operational life. Surface-mount clamp-on sensors read conductive heat through the pipe wall, require no loop downtime to install, and can be repositioned as the cooling architecture changes without disrupting operation.
The efficiency argument connects directly to over-cooling. Most data centers run cooling systems at conservative setpoints: supply temperatures lower than thermal models require, flow rates higher than the actual load demands, chiller plants running at partial load instead of optimal efficiency. The conservatism is rational when operators lack confidence in their temperature and flow data. Better instrumentation produces the data quality that enables setpoint optimization, which reduces chiller and pump energy draw. At the scale of a 50-megawatt data center, a 5% improvement in cooling system efficiency represents 2.5 megawatts of continuous load reduction and millions of dollars in annual operating cost.
Marcon and Rushford add a dimension that most instrumentation discussions skip: cybersecurity. Industrial-grade instruments configured for data center environments have wireless communications disabled at the hardware level, not just in software configuration. The instruments communicate via hardwired protocols, IO-Link and 4-20 milliamp signals, rather than Wi-Fi or Bluetooth. This aligns with the zero-trust security posture that data center operators apply to their compute and network infrastructure but have historically not applied consistently to their operational technology layer. The BMS and DCIM systems that aggregate temperature and flow data are connected to facility networks. An instrument with a wireless backdoor is an attack surface. The operators who are treating their cooling instrumentation layer with the same security discipline as their IT infrastructure are building facilities that will hold their security certifications as the OT attack surface gets more scrutiny from enterprise customers and regulators.