Upd | Ashrae 904 Pdf

ANSI/ASHRAE Standard 90.4-2022 Energy Standard for Data Centers

The most current version of the data center energy standard is , which updated the 2019 edition. Key Updates and Focus Areas

Works in tandem with Standard 90.1 for non-data center portions of a building (like offices or lobbies). 🛠️ Major Updates in the 2022 Version ashrae 904 pdf upd

When you search for , you are really looking for the latest update of ASHRAE Standard 90.4 (Energy Standard for Data Centers). The current version is 90.4-2021 + addenda. Always obtain the official PDF from ASHRAE to ensure you have the correct, enforceable standard. Avoid outdated or mislabeled “904” documents – they do not reflect current energy code requirements.

New iterations systematically lower the maximum allowable MLC and ELC values across all climate zones, reflecting the mainstream adoption of economizers and highly efficient UPS systems. ANSI/ASHRAE Standard 90

The standard offers design flexibility while demanding higher performance.

The recent PDF update to ASHRAE Standard 90.4: Energy Standard for Data Centers marks a significant pivot in how the industry approaches mechanical and electrical system efficiency in high-density computing environments. While ASHRAE 90.1 covers general commercial buildings, Standard 90.4 is specifically tailored to the unique load profiles and 24/7 operational requirements of data centers. This review analyzes the technical revisions in the latest update, focusing on the shift from prescriptive requirements to performance-based metrics and the impact on Power Usage Effectiveness (PUE) baselines. The current version is 90

for other building elements like lighting and the building envelope. Global Relevance : Revised versions, such as Standard 90.4-2019 and the current Standard 90.4-2022

Any new data center or significant addition.

ASHRAE offers a free "read-only" version of the standard on their website for reference, which is useful for checking updates in 2026. Key Takeaways for 2026 Focus on 2022: The 2022 version is the benchmark.