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.
The 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,” says Drake Erbe, chair of the Standard 90.1 committee.
“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.”
The standard has made significant formatting changes to improve its use. These include a one-column format for easier reading; exceptions separated and indented, set apart with a smaller font size; all defined terms are italicized; and alternating coloring scheme for table rows.
The main changes
The most significant technical changes are:
Building Envelope: 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 range from defining exterior walls to building orientation to clarity around the effective R-value of air spaces.
Lighting: Modified control requirements make the application of advanced lighting controls easier for increased energy savings. Modification of exterior and interior lighting power densities reflects the efficiency gains from LED technology in specific applications where they are proven to be effective. Added minimum requirements for lighting in dwelling units to set limits on light-source efficacy are added, as well as for additional control for lighting in parking areas based on occupancy to reduce energy use.
Chilled water plant metering: For the first time, the standard is requiring large electric-driven chilled water plants to be monitored for electric energy use and efficiency.
DOAS requirements: Dedicated outdoor air systems were introduced more than 25 years ago, but there were no rating or efficiency requirements with which to comply. For the first time, this product class does have both efficiency and rating requirements with which they have to comply.
Elevator efficiency: Requirements for designs are to include both usage category and efficiency class. While a minimum threshold is not listed, it is the first step toward including a minimum elevator-efficiency requirement in a future standard. The standard referenced is an ISO standard because this is the current industry standard for efficiency.
Economizer diagnostics: The standard is implementing requirements that air-cooled DX cooling units with economizers have monitoring systems to determine that air economizers are properly working.