ASHRAE Journal - May 2013 - 33

A Stable Whole Building
Performance Method
For Standard 90.1
W
By Michael Rosenberg, Member ASHRAE, and Charles Eley, P.E., FAIA, Member ASHRAE

ouldn’t it be great if a single energy model could be used to served by a water-source heat pump
demonstrate minimum code compliance, green code compli-

ance, establish a LEED rating, and determine eligibility for federal tax
and utility incentives? Even better, what if the basic rules for creating
those models did not change every few years?

A recently proposed addendum to
ANSI/ASHRAE/IES Standard 90.1-2010
aims to meet those goals. Addendum bm
establishes the Performance Rating Method found in Appendix G of Standard 90.1
as a new method of compliance while
maintaining its traditional use in gauging
the efficiency of “beyond code” buildings.
Furthermore, the addendum sets a common baseline building that would stay the
same for 2013 and future versions of Standard 90.1, while only the improvement
target will change with each new edition.

Background
Standard 90.1-2010 has two whole
building performance approaches: the
Energy Cost Budget (ECB) method
May 2013

used for code compliance and the Performance Rating Method (PRM) used
for LEED calculations and other beyond-code programs. The performance
methods are similar in that the design
or proposed building is compared to a
baseline building that is in compliance
with the prescriptive standards. The differences are in the details of how the
baseline is defined and the scope of design elements that can be credited.
The ECB method is intended to be
used for code compliance, and as result,
the baseline building tracks the proposed
design in many respects. For example, if
the proposed building design has woodframed walls, a 20% window-to-wall
ratio, all windows facing south, and is

system, the comparison is to a baseline
building with wood-framed walls, a
20% window-to-wall ratio, all windows
facing south, served by a water-source
heat pump system, with all components
just meeting prescriptive requirements.
If the same building had mass walls,
a 40% window-to-wall ratio, all windows facing west, and an air-source heat
pump system, the comparison would be
to a baseline building with mass walls, a
40% window-to-wall ratio, all windows
facing west, and an air source heat pump
system, with all components just meeting prescriptive requirements.
About the Authors

Michael Rosenberg is a senior research scientist at Pacific Northwest National Laboratory, Eugene, Ore. He is a member of the SSPC
90.1 Energy Cost Budget Subcommittee and the
LEED Energy and Atmosphere Technical Advisory
Group. Charles Eley, P.E., FAIA, is a consulting
architect and mechanical engineer in San Francisco. He is a past member of SSPC 90.1 and is currently a member of SSPC 189.1. He is an ASHRAE
certified building energy modeling professional.

ASHRAE Journal

33



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
ASHRAE Journal - May 2013 - 24
ASHRAE Journal - May 2013 - 25
ASHRAE Journal - May 2013 - 26
ASHRAE Journal - May 2013 - 27
ASHRAE Journal - May 2013 - 28
ASHRAE Journal - May 2013 - 29
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
ASHRAE Journal - May 2013 - 36
ASHRAE Journal - May 2013 - 37
ASHRAE Journal - May 2013 - 38
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ASHRAE Journal - May 2013 - 41
ASHRAE Journal - May 2013 - 42
ASHRAE Journal - May 2013 - 43
ASHRAE Journal - May 2013 - 44
ASHRAE Journal - May 2013 - 45
ASHRAE Journal - May 2013 - PSU Design Build Project
ASHRAE Journal - May 2013 - 47
ASHRAE Journal - May 2013 - 48
ASHRAE Journal - May 2013 - 49
ASHRAE Journal - May 2013 - 50
ASHRAE Journal - May 2013 - 51
ASHRAE Journal - May 2013 - 52
ASHRAE Journal - May 2013 - 53
ASHRAE Journal - May 2013 - Passive Cooling for School
ASHRAE Journal - May 2013 - 55
ASHRAE Journal - May 2013 - 56
ASHRAE Journal - May 2013 - 57
ASHRAE Journal - May 2013 - 58
ASHRAE Journal - May 2013 - 59
ASHRAE Journal - May 2013 - 60
ASHRAE Journal - May 2013 - 61
ASHRAE Journal - May 2013 - Building Sciences
ASHRAE Journal - May 2013 - 63
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ASHRAE Journal - May 2013 - 65
ASHRAE Journal - May 2013 - 66
ASHRAE Journal - May 2013 - 67
ASHRAE Journal - May 2013 - 68
ASHRAE Journal - May 2013 - 69
ASHRAE Journal - May 2013 - InfoCenter
ASHRAE Journal - May 2013 - 71
ASHRAE Journal - May 2013 - 72
ASHRAE Journal - May 2013 - 73
ASHRAE Journal - May 2013 - 74
ASHRAE Journal - May 2013 - Refrigeration Applications
ASHRAE Journal - May 2013 - 76
ASHRAE Journal - May 2013 - 77
ASHRAE Journal - May 2013 - IAQ Applications
ASHRAE Journal - May 2013 - 79
ASHRAE Journal - May 2013 - 80
ASHRAE Journal - May 2013 - 81
ASHRAE Journal - May 2013 - 82
ASHRAE Journal - May 2013 - 83
ASHRAE Journal - May 2013 - Engineer's Notebook
ASHRAE Journal - May 2013 - 85
ASHRAE Journal - May 2013 - Products
ASHRAE Journal - May 2013 - 87
ASHRAE Journal - May 2013 - Data Centers
ASHRAE Journal - May 2013 - 89
ASHRAE Journal - May 2013 - 90
ASHRAE Journal - May 2013 - 91
ASHRAE Journal - May 2013 - Emerging Technologies
ASHRAE Journal - May 2013 - 93
ASHRAE Journal - May 2013 - 94
ASHRAE Journal - May 2013 - Classified Advertising
ASHRAE Journal - May 2013 - Advertisers Index
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