Ashrae 90.4 Pdf Jun 2026
The ELC measures the efficiency of the electrical distribution system. It tracks the losses incurred as power travels from the utility entrance down to the IT racks. The metric evaluates losses across three distinct segments:
ASHRAE 90.4 is a standard published by the American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE) that provides guidelines for the energy-efficient design of data centers. The standard focuses on minimizing energy consumption while maintaining the required level of reliability and performance.
As data centers become the backbone of the digital economy, their energy consumption has escalated significantly. Traditional building energy standards, like , are often unsuitable for the high-density, critical infrastructure of modern data centers. Enter ASHRAE Standard 90.4 , Energy Standard for Data Centers . ashrae 90.4 pdf
ASHRAE Standard 90.4, formally titled Energy Standard for Data Centers , was first published in 2016 by the American Society of Heating, Refrigerating and Air-Conditioning Engineers. It was created because (the baseline energy code for commercial buildings) was not a perfect fit for the unique, high-density nature of data center workloads.
The standard covers various aspects of data center design and operations, including: The ELC measures the efficiency of the electrical
While ASHRAE 90.4 uses calculations that look very similar to PUE, it .
The safest and most professional route is to buy the official PDF from the ASHRAE Bookstore (www.ashrae.org). As of 2025, the current version is (with possible addenda). Cost is typically $99–$150 for members, $150–$200 for non-members. The standard focuses on minimizing energy consumption while
ASHRAE 90.4, titled "Energy Standard for Data Centers," was first published in 2016 and has since become a widely adopted standard for data center design and operations. The standard provides a framework for designing and operating data centers that are energy-efficient, reliable, and sustainable. The current version of the standard is ASHRAE 90.4-2022.
Locate the project site on the ASHRAE climate map.
This section lists other standards you need to read alongside 90.4 (e.g., ANSI/ASHRAE Standard 34 for refrigerant safety, IEC 60364 for electrical installations).
To meet ASHRAE 90.4 requirements, engineers and designers can choose between three distinct compliance pathways:
