Requires more efficient UPS systems because manufacturers have flattened the efficiency curves, improving mainly the lower load ranges where redundant systems generally operate.Some states have also independently adopted 90.4 and it is further referenced in the 2021 version of the International Energy Conservation Code (IECC).Īddendum "b" clarifies requirements in Sections 6 (Mechanical) and 11 (Tradeoffs), where organizations take credits for renewable energy systems.Īddendum "d" modifies the uninterruptible power supply (UPS) definition to include diesel rotary UPS and provides the method of accounting for those systems in calculating the electrical loss component (ELC).Īddendum "e" clarifies how to achieve compliance with Standard 90.4 when shared systems, such as central chiller plants, serve both a data center and the rest of a building. It also provides equations to calculate the annualized mechanical load component (MLC). Addenda changes in ASHRAE standard 90.4ĪSHRAE Standard 90.4 updates in 2022 include a variety of changes including updates to energy use calculations and compliance with shared systems outside the data center.Īddendum "a" encourages heat recovery within data centers and allows a credit under specific circumstances. Some states have also independently adopted 90.4 and it is further referenced in the 2021 version of the International Energy Conservation Code (IECC). jurisdiction adopts Standard 90.1 as code, as do many other countries, 90.4 also becomes code wherever 90.1 is recognized. It will include updated addenda as described below in the 2023 publication.īecause virtually every U.S. Standard 90.4 is referenced in Standard 90.1 as the preferred method to demonstrate that organizations use energy-efficient methods and equipment in the data center design stage. Standard 90.4 is a "sister standard" to Standard 90.1, which continually pushes the design and construction industry to more energy efficient practices. Standard 90.4 will incorporate six important addenda that have completed public review.
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