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ASHRAE Standard 90.4 establishes the minimum energy efficiency requirements of data centers for design, construction, and operation and maintenance, and use of on-site or off-site renewable energy resources.The standard was developed to be code-intended, similar to Standard 90.1, and references in Standard 90.4 are made to Standard 90.1 for building envelope, service water heating, lighting, and other equipment criteria.
- Key updates to the 2019 edition include:
- * In Section 6, a reduction of the maximum MLC values required for compliance, and removal of the design MLC compliance path in favor of a more accurate maximum annualized MLC calculation
- * In Section 8, a reduction of the maximum ELC values for the UPS segment required for compliance, made to recognize improvements in the efficiency of core electrical distribution equipment