Evaluates the efficiency of the power distribution chain, accounting for losses from the utility handoff to the IT equipment racks.
Unlike the common Power Usage Effectiveness (PUE) metric used for operational monitoring, 90.4 is a that uses two primary components for compliance: ASHRAE 90.4 Standard For Data Center Cooling - AKCP ashrae 90.4 pdf
ASHRAE 90.4 is a standard published by the American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE) that provides guidelines for the energy-efficient design of data centers. The standard, titled "Energy Standard for Data Centers," aims to help data center owners and operators reduce energy consumption and improve overall efficiency. Evaluates the efficiency of the power distribution chain,
Using the formulas in Section 6.3, calculate: = Chiller + CRAH fans + Condenser pumps + Cooling tower + Drycooler. Divide this by your Critical IT Load (kW) from the nameplates of your servers. Using the formulas in Section 6
Measures the efficiency of the cooling system, including fans, pumps, and heat rejection equipment.