, ASHRAE frequently releases addenda that are later integrated into the full triennial publication. ASHRAE 90.4 created to boost data center energy efficiency
New iterations systematically lower the maximum allowable MLC and ELC values across all climate zones, reflecting the mainstream adoption of economizers and highly efficient UPS systems. ashrae 904 pdf upd
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Disclaimer: Standards change rapidly. Always verify the specific standard number (e.g., 904-202X) against your local building codes and project requirements before procurement. This link or copies made by others cannot be deleted
Implement specialized building management and computational fluid dynamics (CFD) software to simulate MLC and ELC performance under varying seasonal loads before breaking ground.
Historically, data centers were governed under ASHRAE Standard 90.1 (the energy standard for commercial buildings). However, the unique, mission-critical nature of data center operations rendered 90.1 metrics—such as traditional Building Envelope and general HVAC standards—insufficient.