Power usage effectiveness. A metric used to describe facility efficiency defined simply as the energy entering the facility divided by the energy used by the IT equipment. A facility with equal amounts of overhead and IT energy would have a PUE of 2.0 because only half of the energy is used to power the IT equipment. Overhead can be attributed to many things such as cooling, power conversion, lighting, office equipment not performing the functions of the IT equipment, etc. A partial PUE would an example of a breakdown of the overhead into a specific function such as the cooling partial PUE consisting of all energy associated with the cooling function. Source: ASHRAE
Glossary Category