Final Energy Savings Figures Announced for 2010 Energy Standard
ATLANTA – More than 30 percent
energy savings can be achieved using the recently published 2010
version of Standard 90.1 vs. the 2004 standard, according to an
announcement made today by ASHRAE at its 2011 Winter Conference, taking
place this week.
ANSI/ASHRAE/IES Standard 90.1-2010,
Energy Standard for Buildings Except Low-Rise Residential Buildings,
which provides minimum requirements for the energy-efficient design of
buildings except low-rise residential buildings, was published in
November 2010. ASHRAE was awaiting the final results of analysis work
from Pacific Northwest National Laboratories in support of the U.S.
Department of Energy (DOE) Building Energy Codes Program on addenda
included in the standard. The final figures were made available this
week and were announced today at ASHRAE’s annual press breakfast.
Without plug loads, site energy
savings are 32.6 percent and energy cost savings 30.1 percent.
Including plug loads, the site energy savings are estimated at 25.5
percent and energy cost savings 24 percent.
“Three years ago, the 90.1 project
committee set an aggressive goal of 30 percent savings for the 2010
version,” ASHRAE President Lynn G. Bellenger said. “That the target was
met and exceeded is a testament to the talent and dedication of the men
and women from ASHRAE and the Illuminating Engineering Society (IES)
who developed and evaluated over 119 change proposals to increase the
stringency of our flagship energy conservation standard. At the 35th
anniversary of Standard 90.1, it continues to lead the way in our
industry as the minimum standard for energy efficiency.”
On a nationally aggregated level,
building type energy savings ranged from 8.8 percent to 38.3 percent
and energy cost savings from 7.9 percent to 33.6 percent. These figures
include energy use and cost from plug loads.
Extensive analysis work was
performed by a team from Pacific Northwest National Laboratories in
support of the DOE Building Energy Codes Program. Sixteen different
building prototypes were modeled in 17 different climate zones for a
total of 272 building types and climate zone combinations.
How was the energy reduction achieved? Here are a few examples:
- The Scope was
expanded so that 90.1 covers receptacles and process loads, including
data centers. This allows future addenda to the standard to address
energy consuming equipment and systems previously outside its scope.
- Building Envelope: Continuous air barrier and cool/high albedo roof requirements were added.
- Lighting: Most
interior Lighting Power Densities were lowered, and additional occupant
sensing controls and mandatory daylighting requirements were added for
specific spaces, along with a new five-zone exterior Lighting Power
Density table.
- Mechanical: Most
equipment efficiencies are higher, energy recovery is required in more
applications, economizers are required in more climates and more
energy-conserving controls are required.
- Modeling
requirements have been clarified and expanded so that building modelers
can more accurately compare energy cost of their building project with
an appropriate baseline building as defined by the standard.
“The 90.1 standard is a fluid
document,” Mick Schwedler, immediate past chair of the 90.1 committee,
said. “As technology evolves, the project committee is continually
considering new changes and proposing addenda for public review. The
rigorous, open, public review process following ASHRAE and American
National Standards Institute (ANSI) procedures, results in a document
that is both technically sound and reaches consensus.”
“I agree wholeheartedly with Mick on
the strength attributes of Standard 90.1 based on our ASHRAE/ANSI
consensus process,” echoed Steve Skalko, current chair of the
committee. “As we look ahead to exploring new areas of energy savings
from energy consuming equipment and systems, we will seek input from
materially affected and interested parties. We welcome their input to
help the project committee in this endeavor.”
The standard is written in mandatory
code language and offers code bodies the opportunity to make a
significant improvement in the energy efficiency of new buildings,
additions and major renovations.
ASHRAE is an international technical
society that fulfills its mission of advancing heating, ventilation,
air conditioning and refrigeration to serve humanity and promote a
sustainable world through research, standards writing, publishing and
continuing education.
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