ASHRAE/IES Publish 2016 Energy Efficiency Standard

Numerous energy savings measures resulting from industry input are contained in the newly published energy efficiency standard from ASHRAE and IES.

ANSI/ASHRAE/IES Standard 90.1-2016, Energy Efficiency Standard for Buildings Except Low-Rise Residential Buildings, contains 125 addenda published since the 2013 standard. The 2013 standard currently serves as the commercial building reference standard for state building energy codes.

This 2016 version is the 10th edition published since the original standard was first published in 1975 during the energy crisis of the United States.

“It is the overall goal of each version to create a consensus standard that saves energy and is technically feasible and cost effective,” Drake Erbe, chair of the Standard 90.1 committee, said. “In addition, as a result of a strategic initiative begun in the 2013 cycle, the 2016 version has a new format that we believe will be easier for users, a new way of incorporation of reference material from other standards starting with climate data, and a performance path for compliance that rewards designs for achieving energy cost levels above the standard minimum.”

According to ASHRAE, the revised standard includes a number of changes related to the building envelope. These include:

  • The mandatory provisions include the addition of envelope verification in support of reduced air infiltration and increased requirements for air leakage to overhead coiling doors.
  • The prescriptive requirements include increased stringency requirements for metal building roofs and walls, fenestration and opaque doors. Requirements for Climate Zone 0 have been added.
  • Improved clarity of the standard ranged from defining exterior walls to building orientation to clarity around the effective R-value of air spaces.

Under Energy Cost Budget (ECB) and Modeling, the standard includes a significant change to the application of Appendix G as follows:

  • Appendix G now can be used as a path for compliance with the standard. Previously Appendix G was used only to rate “beyond code” performance of buildings. This new version of Appendix G can show compliance with the 2016 version of the standard in the following manner:
    •  The proposed building design requires a new metric the Performance Cost Index (PCI) and demonstration that it is less than that shown in Table based on building type and climate zone.
    • Another change is that the baseline design is now fixed at a certain level of performance, the stringency or baseline of which is expected not to change with subsequent versions of the standard. By this, a building of any era can be rated using the same method.

Additional structural changes include:

  •  Reference Standard Reproduction Annex 1 at the end of the document. This annex is designed to contain extracts from other references that are published with Standard 90.1 for the convenience of users. At present, the only standard this pertains to is ANSI/ASHRAE Standard 169, Climatic Data for Building Design Standards.  Section 5.1.4 now cites this standard as the source for climatic data therefore extractions of tables and figures from Standard 169-2013 are included in Annex 1
  •  Addition of 2 weather zones 0 A/B in all prescriptive requirements tables to correspond with Standard 169.

The standard can be purchased here: