Coordinating Power and Cooling in a Data Centre

KEY POINTS

Map cooling equipment and controls to their actual power supplies.
Agree restart behaviour and cooling continuity for each operating scenario.
Test electrical, mechanical and monitoring interfaces together.

Cooling equipment and IT equipment depend on a coordinated electrical design. A cooling unit may have an available power source yet still be unable to restart because a pump, control panel or communication link has not recovered.

Start with an equipment and supply matrix

List the cooling equipment, its controls and the supporting systems. Identify each supply, the expected demand and the required behaviour during a change of operating state. Schneider Electric’s electrical installation guide explains the distinction between installed power and assessed demand; equipment nameplates alone do not describe every operating scenario.

System	Information to agree
Chillers or direct-expansion units	Running demand, starting characteristics and restart restrictions
Pumps and fans	Duty arrangement, drive characteristics and recovery sequence
Local controls and sensors	Power source, loss-of-power response and retained settings
Building management system (BMS)	Status points, alarms, commands and communication recovery
Standby supply	Connected loads, starting sequence and capacity assessment

Assign an owner to every interface. Make clear which information comes from the equipment supplier, electrical designer, mechanical designer and controls team.

Define the operating scenarios

Ask the design team to explain normal operation, planned maintenance, loss of supply and recovery. Establish which cooling functions must continue and which can restart within an agreed period. Thermal behaviour depends on the facility and load; do not apply a universal time limit.

Terms such as N+1 describe a capacity arrangement, but do not by themselves demonstrate the performance of a complete facility. Uptime Institute’s Tier definitions assess infrastructure outcomes. Any certification target should be translated into project-specific design and test requirements.

Turn the sequence into a test plan

Agree the permitted test conditions, expected results, witness responsibilities and recovery plan before commissioning. Useful questions include:

Does each cooling component recover in the approved sequence?
Do controls and communication links return to the correct state?
Are alarms visible at the intended monitoring point?
Can the approved maintenance arrangement be demonstrated?
Are temporary settings removed and final settings recorded?

Testing should follow the approved method and the equipment suppliers’ limits, with appropriate protection for any operating loads.

Keep the handover connected to the design

Request updated supply drawings, equipment schedules, control sequences, point lists and test records for the agreed scope. Record unresolved items and who owns the follow-up.

ETES’s data-centre electrical service covers electrical systems and coordination with cooling and building systems. The DAMAC BKK01 project provides an example of the documented ETES scope in BMS interfaces and functional testing.