DATA CENTRE WORLD EUROPE - PARIS 2026

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Frequently asked

Glossary

1

PUE (Power Usage Effectiveness)

A ratio of total data centre energy use to the energy delivered to IT equipment. A PUE closer to 1.0 indicates less overhead from cooling, power distribution and lighting; operators use it to compare efficiency and report on sustainability targets.

2

Liquid cooling

Cooling approach that uses liquid instead of air to remove heat from servers. Common forms include direct-to-chip cold plates and immersion cooling, both relevant to high-density AI and GPU racks.

3

CDU (Coolant Distribution Unit)

A unit that circulates and conditions coolant between a facility water loop and IT cooling loops. CDUs are central to direct-to-chip liquid cooling deployments in high-density halls.

4

DCIM (Data Centre Infrastructure Management)

Software and sensors used to monitor, manage and plan data centre assets, power, cooling and capacity. DCIM helps operators track rack density, available power and cooling headroom.

5

Colocation

A model where a provider rents data centre space, power, cooling and interconnection to multiple customers. Colocation buyers compare power density, redundancy, security and carrier access.

6

Edge data centre

A smaller facility placed close to users or devices to reduce latency and backhaul. Edge sites often use modular designs and remote monitoring rather than full-time on-site staff.

7

UPS (Uninterruptible Power Supply)

A battery-backed power system that bridges the gap between mains failure and generator start-up. UPS sizing and topology are key decisions for uptime and energy efficiency.

8

Containment

Physical separation of hot and cold air streams in a data hall, typically using aisle containment panels and doors. Containment improves cooling efficiency and supports higher rack densities.

9

Rack power density

The amount of electrical power delivered to a single rack, usually expressed in kW per rack. AI and GPU workloads are pushing densities well above traditional enterprise averages.

10

Waste heat reuse

Capturing heat rejected by data centre cooling systems and redirecting it to district heating, greenhouses or other users. It is part of broader energy and carbon reduction planning.

11

Tier classification

A rating of data centre redundancy and availability, commonly associated with Uptime Institute tiers. Tier levels describe fault tolerance and maintenance capability rather than energy efficiency.

12

Cross-connect

A physical fibre or copper link between two customers or networks inside a colocation facility. Cross-connects enable private interconnection and are often priced separately from space and power.

13

Meet-me room

A shared space in a carrier-neutral data centre where networks and customers interconnect. It reduces latency and avoids backhauling traffic through public internet routes.

14

Free cooling

Using outside air or water-side economizers to cool a data centre when ambient conditions allow, reducing mechanical chiller run time. Effectiveness depends on local climate and facility design.