ASHRAE standards are proprietary and typically require purchase, but there are two primary ways to access the text:
ASHRAE Standard 90.4 was first published in 2016 as a companion to the famous (Energy Standard for Buildings Except Low-Rise Residential). While 90.1 covers most buildings, 90.4 focuses exclusively on data centers – recognizing their unique IT equipment loads, cooling demands, and 24/7 operation. ashrae 904 pdf upd
The 2022 revision responds to three industry shifts: Lowered maximum allowable MLC values across various climate
You can purchase the full Standard 90.4-2022 from the ASHRAE Bookstore. ashrae 904 pdf upd
The introduces significant shifts toward total sustainability and decarbonization. Notable updates include: ASHRAE Releases Revised Version of Data Center Standard
In the past, building owners often chose the cheapest air conditioner or boiler upfront, only to pay triple the cost in energy bills over ten years. ASHRAE 904 provides the legal and engineering framework to prove that a high-efficiency variable refrigerant flow (VRF) system or a geothermal heat pump is actually cheaper in the long run than a standard packaged unit.
Lowered maximum allowable MLC values across various climate zones to drive higher efficiency.