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Proposed ASHRAE Data-Center Standard Open for Public Comment

May 16, 2016
A fourth public review of proposed ASHRAE Standard 90.4P, Energy Standard for Data Centers, is under way until May 29.

A fourth public review of proposed ASHRAE Standard 90.4P, Energy Standard for Data Centers, is under way.

ASHRAE Standard 90.4P covers design and construction, creation of operation-and-maintenance plans, and utilization of on-site and off-site renewable-energy resources.

“This standard impacts a specialized discipline, so feedback from that industry is critical,” Ron Jarnagin, 90.4P committee chair, said. “The data-center industry responded to the three public reviews thus far with more than 1,000 comments, which have guided us as we move toward publication. We are hopeful we will approve a final standard at the ASHRAE 2016 Annual Conference taking place this summer.”

Changes made to the draft standard include:

  • Revision of the definition of incoming electrical-service point.
  • Deletion of the second exception in, Additions to Existing Data Centers.
  • Correction of peak-power equations in and
  • Deletion of 3B Coast from tables and to ensure alignment with ANSI/ASHRAE Standard 169-2013, Climatic Data for Building Design Standards.
  • Addition of a section describing the process for verifying equipment efficiencies to sections 6 and 8.
  • Correction of equations in Compliance Section 11.2.1.
  • Revision of Section 11.3 to indicate how compliance can be demonstrated through modeling of shared systems between ANSI/ASHRAE/IES Standard 90.1-2013, Energy Standard for Buildings Except Low-Rise Residential Buildings, and 90.4 spaces.
  • Updating of references in Section 12 for Standard 90.1 and ASHRAE’s “Thermal Guidelines for Data Processing Environments.”

The standard will be open for public comment until May 29. For more information and to comment, go to