Ashrae 90.4 Pdf ⏰

For years, data centers fell under the jurisdiction of ( Energy Standard for Buildings Except Low-Rise Residential Buildings ). However, the industry quickly realized that Standard 90.1 was not a perfect fit. The Limitations of Standard 90.1

ASHRAE 90.4 uses a performance-based approach, focusing on two primary components rather than just the traditional Power Usage Effectiveness (PUE) metric:

Backup systems (like UPS and generators) introduce unique energy losses not found in standard commercial properties. Key Components of ASHRAE 90.4 ashrae 90.4 pdf

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Adhering to ASHRAE 90.4 shifts how engineers approach data center architecture: For years, data centers fell under the jurisdiction

The exact equations required to calculate annual and hourly MLC and ELC variations.

The benefits of implementing ASHRAE 90.4 include: Key Components of ASHRAE 90

Officially titled "Energy Standard for Data Centers," ASHRAE Standard 90.4 is a game-changer. While its sibling, ASHRAE 90.1, covers most commercial buildings, Standard 90.4 is tailored specifically for the unique mechanical (HVAC) and electrical (power distribution) loads of data centers.

This is the most common path. It allows a designer to "trade off" performance between the mechanical and electrical systems. For example, if a data center has a highly efficient electrical system (low ELC), it may be permitted to have a slightly less efficient cooling system (higher MLC), provided the combined total energy use remains below the allowable limit.

The standard gives you a maximum allowable energy budget based on: