0.20 ≤ 0.18? No. Fail .
ASHRAE Standard 90.4, , establishes the minimum energy efficiency requirements for the design, construction, and operation of data center facilities . Unlike Standard 90.1, which is for general commercial buildings, 90.4 is specifically tailored to the unique, high-density load requirements of data centers . Core Compliance Framework ashrae 90.4 pdf
Traditional energy standards focus on envelope insulation, lighting power density, and HVAC efficiency for human comfort. Data centers invert these priorities. Their energy consumption is dominated by IT equipment (servers, storage, networking) and the cooling infrastructure required to remove the resulting heat. Lighting is negligible, and heating is often unwanted. Applying Standard 90.1 led to inefficient designs—for example, requiring excessive insulation that did little to reduce energy use, or limiting economizer use despite favorable climates. ASHRAE Standard 90
ASHRAE 90.4 is considered a "sister standard" or companion to the more general . ASHRAE Releases Revised Version of Data Center Standard Data centers invert these priorities
Imagine you are designing a 2 MW IT load data center in Atlanta, Georgia (Climate Zone 3A).
The MLC is a metric representing the maximum allowable mechanical power (cooling, fans, pumps) divided by the total IT equipment load. It is expressed in .