[Bldg-sim] ASHRAE/IES Publish 90.1-2016 Energy Efficiency Standard

[Jason Glazer via Bldg-sim]

***ASHRAE/IES Publish 2016 Energy Efficiency Standard*

ATLANTA – 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 10^th 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.”

*Formatting*

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 most significant technical changes included are as follows:

  * *Building Envelope*:
      o 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.
      o 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.
      o Improved clarity of the standard ranged from
        defining exterior walls to building orientation to
        clarity around the effective R-value of air spaces
  * *Lighting:*
      o Modified control requirements that make the
        application of advanced lighting controls easier for
        increased energy savings
      o Modification of exterior and interior lighting power
        densities that reflect the efficiency gains from LED
        technology in specific applications where they are
        proven to be effective
      o Added minimum requirements for lighting in dwelling
        units to set limits on light source efficacy
      o Added additional control for lighting in parking
        areas based on occupancy to reduce energy use
  * *Mechanical:*
      o 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.
      o DOAS requirements – Dedicated outdoor air systems
        were introduced over 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.
      o Elevator efficiency –Introduces requirements for
        designs to include both usage category and
        efficiency class. While a minimum threshold is not
        listed, it is the first step toward including
        minimum elevator efficiency requirement in a future
        standard.  The standard referenced is an ISO
        standard since this the current industry standard
        for efficiency.
      o Economizer diagnostics – The standard is
        implementing requirements that air cooled DX cooling
        unit with economizers have a monitoring system to
        determine that the air economizer is properly working.

  * *Energy Cost Budget (ECB) and Modeling.*A significant
    change to the application of Appendix G as follows:

oAppendix 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:

o The proposed building design requires a new metric the 
Performance Cost Index (PCI) and demonstration that it is 
less than that shown in Table 4.2.1.1 based on building type 
and climate zone.

oAnother 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.

oOther modifications to Appendix G include: elevator, motor, 
and refrigeration baselines; changes to the baseline for 
existing building projects; as well as specific opaque 
assemblies for the baseline envelope model. Modeling rule 
changes were also made to heat pump auxiliary heat, 
economizer shutoff, lighting controls, humidification 
systems, cooling towers, and the simulation of preheat coils.

Additional *structural changes* include:

o 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

o Addition of 2 weather zones 0 A/B in all prescriptive 
requirements tables to correspond with Standard 169.

The cost of is $119, ASHRAE members ($140, non-members). To 
order, visit www.ashrae.org/bookstore 
<http://www.ashrae.org/bookstore> or contact ASHRAE Customer 
Contact Center at 1-800-527-4723 (United States and Canada) 
or 404-636-8400 (worldwide) or fax 678-539-2129.

ASHRAE, founded in 1894, is a global society advancing human 
well-being through sustainable technology for the built 
environment. The Society and its more than 56,000 members 
worldwide focus on building systems, energy efficiency, 
indoor air quality, refrigeration and sustainability. 
Through research, standards writing, publishing, 
certification and continuing education, ASHRAE shapes 
tomorrow’s built environment today. More information can be 
found at www.ashrae.org/news <http://www.ashrae.org/news>.


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