ASHRAE Standard 90.4, titled "Energy Standard for Data Centers,"
ASHRAE Standard 90.4 is the benchmark for energy efficiency in data centers, providing a flexible, performance-based alternative to the more general ASHRAE 90.1 ashrae 90.4 pdf
If you are designing a data center for a 10-year lifespan, you should download the current ASHRAE 90.4 PDF but also monitor the standing standard project committee (SSPC 90.4) for public review drafts. ASHRAE Standard 90
: Defines the minimum energy efficiency for the design, construction, and operation of new data centers or major modifications to existing facilities. Renewable Energy ASHRAE Standard 90.4