ISO/IEC 30134-7:2023

This document specifies the cooling efficiency ratio (CER) as a key performance indicator (KPI) for quantifying the efficient use of energy to control the temperature of spaces within a data centre (DC). This document: a)    defines the CER of a DC; b)    describes the relationship of this KPI to a DC’s infrastructure, information technology equipment and information technology operations; c)    defines the measurement, the calculation and the reporting of the parameter; and d)    provides information on the correct interpretation of the CER. Annex A describes the correlation of the CER and other KPIs. Annex B provides examples of the usage of the CER. Annex C introduces the parameters that affect the CER. Annex D describes requirements and recommendations for derivatives of KPIs associated with the CER. This document is not applicable to cooling systems that are not powered by electricity (e.g. heat-driven absorption chillers).