Pdf Upd - Ashrae 904

The Importance of ASHRAE 90.4 PDF Update: Enhancing Energy Efficiency in Data Centers

Official ASHRAE Bookstore: Purchase immediate PDF downloads or print versions.

Electrical Loss Component (ELC): Tracks losses within the power distribution chain.

Practical Implications for Engineers and Owners

For consulting engineers – Update your energy modeling templates to use the 2022 climate data. The allowable PUE in mild climates (e.g., Zone 4) may drop by 0.02–0.05, requiring better free-air cooling or higher-efficiency EC fans.
For facility owners – The redundancy multiplier allows you to maintain high availability without failing code compliance. However, you must still meter sub-systems separately to claim the multiplier.
For contractors – Variable-speed drives are no longer optional on condenser fans for new builds > 300 kW IT load.

Climate Zones: Sets different efficiency thresholds based on the facility's geographic location.

For those interested in learning more about ASHRAE 90.4, the following resources are available:

Important: There is no ASHRAE 904. If a PDF claims to be “ASHRAE 904,” it is either a mislabeled 90.4 or a fake document.

Benefits of the ASHRAE 90.4 PDF Update

Practical Implications for Engineers and Owners

Climate Zones: Sets different efficiency thresholds based on the facility's geographic location. For consulting engineers – Update your energy modeling

For those interested in learning more about ASHRAE 90.4, the following resources are available:

Important: There is no ASHRAE 904. If a PDF claims to be “ASHRAE 904,” it is either a mislabeled 90.4 or a fake document.

Benefits of the ASHRAE 90.4 PDF Update