Server Room and Data Centre MEP: Cooling, Power and Resilience

A different problem from the office around it

Designing a server room as a small office with extra air conditioning is the error this page exists to prevent.

Cooling that runs when the building does not

The single most common failure is a server room served by the office system.

Office cooling is scheduled. Server equipment is not. When the building shuts down for the night or a long weekend, the load continues producing heat into a closed room, and temperature climbs steadily with nobody present.

A dedicated system, running independently of building occupancy and backed by the generator, is what the room actually needs.

Sizing for the future, not the present

Heat load comes principally from the equipment's electrical draw, since almost all of it becomes heat, plus fabric gains, lighting and people.

The critical input is the future load. A room cooled for today's racks reaches its cooling limit long before it fills, and adding cooling to an occupied, cabled server room is far harder than providing for it initially.

Building services provisions sit in NBC 2016, Part 8, and the load calculation must come from the project's MEP consultant.

Redundancy is a business decision

How much duplication is appropriate depends on what an outage costs — which is a question for the business, not the engineer.

The useful framing: how long can this room be without cooling before equipment is at risk? In a well-insulated room with a dense load, the answer is often minutes rather than hours, which surprises people and usually settles the redundancy discussion quickly.

Power, including the cooling

Three things must be on the backup supply:

1. The equipment, via UPS then generator
2. The cooling for the room, via generator
3. Monitoring and alarms, so failures are still reported

Backing up the servers while their cooling stops does not avoid the outage; it delays it. Circuits should be segregated physically at the distribution boards and identified, following installation practice in IS 732.

Fire, containment and construction

Detection for early warning and suppression suited to electronics are the starting points, but the room's construction matters too — how it is separated from the rest of the floor, how services penetrate it and how those penetrations are sealed.

What is required for a specific room is determined under NBC 2016, Part 4 by the fire consultant and the authority having jurisdiction, and it should be established early because it affects the room's fabric as well as its services.

Cabling and layout

Structured cabling follows ISO/IEC 11801, with power and data segregated, containment sized for growth, and cable routes planned so that adding equipment later does not mean disturbing what is already live.

Leave room to work. A server room packed to its walls is one where every future change carries risk to the equipment already running.

Monitoring that reaches someone

• Temperature and humidity in the room
• Cooling system status and failure alarms
• UPS status and battery condition
• Leak detection beneath raised floors and near cooling units
• Door and access alarms where appropriate

And critically: alarms must reach a person who can act, at any hour. An alert delivered to an unmonitored mailbox is a record of the failure, not a defence against it.

Standards referenced

Fire and life safety provisions in NBC 2016, Part 4; building services in NBC 2016, Part 8; electrical installation practice in IS 732; structured cabling in ISO/IEC 11801. Heat load, cooling capacity, redundancy, electrical design and fire requirements for a specific room must be established by the project's MEP and fire consultants and the authority having jurisdiction.