ASHRAE Journal - May 2013 - 45

• The ECB subcommittee can focus
their efforts on improving the methodology instead of playing catch-up with
prescriptive changes. There is a long
list of improvements on the ECB subcommittee’s to-do list including adding
more appropriate system types for different building types and adding detail
to many of the modeling rules that are
left somewhat ambiguous.
Figure 2 shows an example of how the
performance requirements of Standard
90.1 and beyond-code programs could
progress toward zero-net-energy buildings using the Addendum bm approach.

What Are the Risks?
There are really only two significant
risks to the Addendum bm approach:
that compliance is too difficult for some
buildings, or that it is too easy (a loophole) for others. The committee has given
a great deal of consideration to both risks.
With respect to the first, there may be
buildings that have a hard time complying with the Addendum bm approach and
perhaps building-type-specific targets will
need to be developed in the future. This is
a small risk, as no building will be forced
to comply using this path: the prescriptive
option and the ECB method are still available. A longer-term goal is to replace the
ECB method entirely, but that is not being
proposed now.
Conversely, the risk of the method being a loophole is the one that is likely to
be more of a concern to energy saving
advocates. However, with a requirement
for performance 45% better than the
2004 baseline, using the PRM approach
that establishes good baseline mechanical systems, neutral orientation, reasonable pumping and fan power limits and
reasonable levels of glazing, that risk
seems minimal.

Conclusion
Addendum bm won’t solve all the
problems associated with assessing
building energy performance. It may
lead to some unforeseen problems of its
own, and will certainly need to be adjusted through future addenda. However, it prepares Standard 90.1 for a future
in which performance-based compliMay 2013

ance is likely to assume a much larger
role in energy codes and standards. It
may even set the stage for future versions of the Standard to take a more topdown approach where the performance
goal is developed first and packages of
prescriptive requirements are created to
match those goals.9
SSPC 90.1 recognizes the road ahead
may not be perfectly smooth but believes
this path forward is a potential game
changer for performance-based code compliance since it significantly reduces the
complexity of modeling efforts required
for design teams and provides a consistent
benchmark for building owners.

Acknowledgments
The authors would like to acknowledge support from the U.S. Department
of Energy Building Energy Codes Program and the SSPC 90.1 Energy Cost
Budget Subcommittee.

References
1. Rosenberg M., et al. 2013. “Advantages
and disadvantages of alternative formats to
achieve more efficient energy codes for commercial buildings.” ASHRAE Papers CD:
2013 ASHRAE Winter Conference. Atlanta:
ASHRAE.
2. 10 CFR Part 433. 2008. Federal Building
Energy Efficiency Standards. http://tinyurl.
com/cssvdgn.
3. M. Deru. 2007. Energy Savings Modeling and Inspection Guidelines for Commercial
Building Federal Tax Deductions. NREL/
TP-550-40467, National Renewable Energy
Laboratory.
4. U.S. Department of Energy, Energy
Efficiency and Renewable Energy, Building
Energy Codes Program. 2013. Status of State
Energy Code Adoption. http://tinyurl.com/
dy8ac56.
5. United States Green Building Council.
2005. Green Building Rating System for New
Construction & Major Renovation (LEED-NC).
6. United States Green Building Council.
2013. LEED Credit Library, New Construction, v4 Draft. http://tinyurl.com/c4uzsah.
7. Washington State Energy Code 2009
Edition. http://tinyurl.com/c9eb2rc.
8. International Code Council. 2011. 2010
Florida Building Code: Energy Conservation.
ISBN: 978-1-60983-191-2.
9. Eley, C., et al. 2011. “Rethinking percent
savings—the problem with percent savings
and zEPI: the new scale for a net zero energy
future.” ASHRAE Transactions 117(2):787.

www.info.hotims.com/44632-30

ASHRAE Journal

45



ASHRAE Journal - May 2013

Table of Contents for the Digital Edition of ASHRAE Journal - May 2013

ASHRAE Journal - May 2013
Contents
Commentary
Industry News
Letters
Meetings and Shows
Feature Articles
VAV Reheat Versus Active Chilled Beams & DOAS
A Stable Whole Building Performance Method for Standard 90.1
Technology Award Case Studies:
PSU Design Build Project
Passive Cooling for School
Standing Columns
Building Sciences
InfoCenter
Refrigeration Applications
IAQ Applications
Engineer's Notebook
Products
Data Centers
Emerging Technologies
Classified Advertising
Advertisers Index
ASHRAE Journal - May 2013 - ASHRAE Journal - May 2013
ASHRAE Journal - May 2013 - Cover2
ASHRAE Journal - May 2013 - 1
ASHRAE Journal - May 2013 - 2
ASHRAE Journal - May 2013 - Contents
ASHRAE Journal - May 2013 - Commentary
ASHRAE Journal - May 2013 - 5
ASHRAE Journal - May 2013 - Industry News
ASHRAE Journal - May 2013 - 7
ASHRAE Journal - May 2013 - 8
ASHRAE Journal - May 2013 - 9
ASHRAE Journal - May 2013 - 10
ASHRAE Journal - May 2013 - 11
ASHRAE Journal - May 2013 - 12
ASHRAE Journal - May 2013 - 13
ASHRAE Journal - May 2013 - Letters
ASHRAE Journal - May 2013 - 15
ASHRAE Journal - May 2013 - Meetings and Shows
ASHRAE Journal - May 2013 - 17
ASHRAE Journal - May 2013 - VAV Reheat Versus Active Chilled Beams & DOAS
ASHRAE Journal - May 2013 - 19
ASHRAE Journal - May 2013 - 20
ASHRAE Journal - May 2013 - 21
ASHRAE Journal - May 2013 - 22
ASHRAE Journal - May 2013 - 23
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ASHRAE Journal - May 2013 - 30
ASHRAE Journal - May 2013 - 31
ASHRAE Journal - May 2013 - 32
ASHRAE Journal - May 2013 - A Stable Whole Building Performance Method for Standard 90.1
ASHRAE Journal - May 2013 - 34
ASHRAE Journal - May 2013 - 35
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ASHRAE Journal - May 2013 - PSU Design Build Project
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ASHRAE Journal - May 2013 - Passive Cooling for School
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ASHRAE Journal - May 2013 - Building Sciences
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ASHRAE Journal - May 2013 - InfoCenter
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ASHRAE Journal - May 2013 - 73
ASHRAE Journal - May 2013 - 74
ASHRAE Journal - May 2013 - Refrigeration Applications
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ASHRAE Journal - May 2013 - 77
ASHRAE Journal - May 2013 - IAQ Applications
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ASHRAE Journal - May 2013 - 83
ASHRAE Journal - May 2013 - Engineer's Notebook
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ASHRAE Journal - May 2013 - Products
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ASHRAE Journal - May 2013 - Data Centers
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ASHRAE Journal - May 2013 - 90
ASHRAE Journal - May 2013 - 91
ASHRAE Journal - May 2013 - Emerging Technologies
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