ITU-T L.1320 PDF

This Recommendation specifies principles and concepts of energy efficiency metrics and measurement methods for power feeding equipment and cooling equipment in telecommunications rooms and data centres.

The methodologies defined in this Recommendation are applied at single equipment level. The efficiency of power conversion and cooling in the data centre or telecommunication facility is only partially attributed to the equipment. The architecture and organization of the space and equipment to deliver the power or cooling to the systems is as equal, if not a more significant factor in energy efficiency. Another general factor is the interoperability, management and response of these systems across the demand and operational range.

NOTE – Cooling equipment: In general, data centre level systems should be referred (or normalized) with respect to a full year, in order to take into account the yearly variability of environmental conditions and the consequent possible use of various cooling methods. The reference to a whole year helps to establish a power usage effectiveness (PUE) comparison, especially with respect to an individual data centre.

This Recommendation covers:

• Power feeding equipment:

• AC power feeding equipment;
• DC power feeding equipment;
• Renewable energy equipment1.

• Cooling equipment:

• Air conditioner equipment;
• Outdoor air cooling equipment;
• Heat exchanging cooling equipment.