Achieving the 30% Goal: Energy and Cost Savings Analysis of ASHRAE Standard 90.1-2010 Page: 4 of 370
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Executive Summary
This project was conducted by Pacific Northwest National Laboratory (PNNL) in support of the U.S.
Department of Energy's (DOE's) Building Energy Codes Program (BECP). DOE's BECP supports the
upgrading of the building energy codes and standards, and the states' adoption, implementation, and
enforcement of those codes and standards as they are incrementally upgraded. Building energy codes and
standards set minimum requirements for energy-efficient design and construction for new and renovated
buildings, and impact energy use and emissions for the life of buildings. They are part of a broader set of
documents which govern the design and construction of buildings for the health and life safety of
occupants. Energy codes and standards set a baseline for energy efficiency in construction by establishing
minimum energy-efficiency requirements. Improving these documents generates consistent and long-
lasting energy savings.
When the model energy codes and standards for buildings are being updated, BECP reviews the
technical and economic basis of these documents. For commercial and multi-family high-rise residential
buildings, which are the subject of this report, the basis for the energy codes is the ANSI/ASHRAE/IES'
Standard 90.1. The 2004, 2007, and 2010 versions of Standard 90.1 are all utilized in the analysis
described in this report (ANSI/ASHRAE/IESNA 2004, 2007 and ANSI/ASHRAE/IES 2010). These
standards are referred to as 90.1-2004, 90.1-2007 and 90.1-2010 respectively in this report or as Standard
90.1 when referring to multiple versions of 90.1. For one and two family dwellings, townhouses and low-
rise multi-family residential buildings, which are not the subject of this report, the relevant code is the
International Energy Conservation Code (IECC).
BECP carries out the following activities:
" Recommends revisions and amendments to the model energy codes and standards during cyclical
updates
" Seeks adoption of all technologically feasible and economically justified energy efficiency
measures in these documents
" Participates in the processes that update and maintain these documents.
In 2007, as part of its Advanced Codes Initiative, DOE signed a memorandum of understanding
(MOU) with ASHRAE to develop advanced commercial standards and included an agreement that 90.1-
2010 would result in 30% energy savings relative to 90.1-2004. This MOU initiated the effort by BECP
and ASHRAE which culminated in the release of 90.1-2010 in October 2010. This signed MOU
introduced a new element and significant challenges for developing 90.1-2010. For the first time in the
history of Standard 90.1, an energy goal was established for developing the new edition, 90.1-2010. The
30% energy efficiency goal led to a dramatic increase in the level of activity and enhancement of
Standard 90.1 as reflected in the quantity of changes, called addenda, proposed and approved. Prior to the
development of 90.1-2010, the last three updates of Standard 90.1 to the 2001, 2004 and 2007 editions
generated 34, 32 and 44 approved addenda, respectively. When 90.1-2010 was published, 109 approved
addenda to 90.1-2007 were incorporated.
ANSI - American National Standards Institute; ASHRAE - American Society of Heating, Refrigerating, and Air-
Conditioning Engineers; IES - Illuminating Engineering Society of North America; prior to 90.1-2010, IESNA
rather than IES is identified as one of the originators, IESNA is Illuminating Engineering Society of North America.iii
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Thornton, Brian A.; Rosenberg, Michael I.; Richman, Eric E.; Wang, Weimin; Xie, YuLong; Zhang, Jian et al. Achieving the 30% Goal: Energy and Cost Savings Analysis of ASHRAE Standard 90.1-2010, report, May 24, 2011; Richland, Washington. (https://digital.library.unt.edu/ark:/67531/metadc840137/m1/4/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.