Energy Standard for Data Centers and Telecommunications Facilities
I cannot directly provide or link to the PDF, as it is a copyrighted technical document. However, I can offer interesting and useful content regarding this specific standard, its purpose, and where you can legitimately access it.
A: ASHRAE has a continuous maintenance process. Standards are typically reaffirmed, revised, or withdrawn every 5 to 8 years. However, addenda (smaller updates) can be released as often as twice per year. ashrae 904 pdf upd
This version lowered the required MLC and ELC values, improved calculation examples, and provided a new methodology to apply credits for on-site renewable energy use. In June 2019, an addendum to ASHRAE 90.1 officially recognized 90.4 as the official energy-efficiency standard for data centers, resolving previous conflicts between the two standards.
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. In June 2019, an addendum to ASHRAE 90
Lowered maximum allowable ELC thresholds; aligned UPS technology definitions.
Recent updates, primarily from the 2022 to 2025 cycle, focus on tightening efficiency requirements and rewarding sustainable practices: Lowered Compliance Thresholds : Maximum values for both the Mechanical Load Component (MLC) Electrical Loss Component (ELC) fueled by cloud computing and AI
Utilize air-side or water-side economizers to maximize hours of "free cooling," significantly reducing your calculated MLC.
ASHRAE 90.4 is a standard for energy efficiency in data centers, and it provides guidelines for designing and operating data centers to minimize energy consumption. Here are a few key points and updates related to ASHRAE 90.4:
As data centers continue to expand rapidly, fueled by cloud computing and AI, energy efficiency is paramount. For designers, engineers, and facility managers, the premier standard for this sector is , Energy Standard for Data Centers . This article provides a comprehensive overview of the latest developments, focusing on the ASHRAE 90.4-2022 standard (the current operative standard as of 2026) and its critical updates.