Introduction to ASHRAE 90.4

How to Comply with ASHRAE 90.4: A Step-by-Step Workflow

Once you have the official PDF, follow this engineering workflow:

By following the guidelines and requirements set out in ASHRAE 90.4, data center owners and operators can improve energy efficiency, reduce waste, and increase reliability.

Key Highlights of ASHRAE 90.4

Current Status: In recent years, ASHRAE has moved to consolidate its standards. The technical content of 90.4 has largely been integrated into ASHRAE 90.1 (specifically in recent editions like 90.1-2022). However, 90.4 remains a distinct document for jurisdictions that have specifically adopted it into code, or for designers looking for data-center-specific guidance.

Step 3: Calculate Your Planned MLC

Using the formulas in Section 6.3, calculate: Total mechanical power (kW) = Chiller + CRAH fans + Condenser pumps + Cooling tower + Drycooler. Divide this by your Critical IT Load (kW) from the nameplates of your servers.

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