ASHRAE Journal - January 2015 - 26

TECHNICAL FEATURE

Have We Run Out
Of Savings Potential
In Standard 90.1?
BY REID HART, P.E., MEMBER ASHRAE

As part of their support to the ASHRAE Standing Standard Project Committee (SSPC)
for Standard 90.1, Energy Standard for Buildings Except Low-Rise Residential Buildings,1 Pacific
Northwest National Laboratory (PNNL) staff members regularly perform a progress indicator analysis to quantitatively measure the progress of Standard 90.1 through its threeyear standard development cycle.2 The standard, which provides the minimum energyefficiency requirements for design and construction, has produced significant energy
savings since the first edition of Standard 90 in 1975. With challenging energy reduction
goals ahead of us3 combined with significant savings already achieved, code developers
wonder if we have reached a point of diminishing returns in advancing energy codes and
standards.
Currently, proposals considered for Standard 90.1 are
required to be cost effective, and this restricts possible
additions to the standard. To assist in finding the next
round of efficiency improvement opportunities, PNNL
conducted an end-use analysis of commercial building
prototypes simulated to meet Standard 90.1-2013.1 This
analysis was performed to allow Standard 90.1 committee
members to focus on areas of greatest potential savings.
The results can also help design professionals understand
where energy is being used in different building types
and climates so they can focus further efficiency efforts in
those areas.

Savings from Standard 90.1
The first national commercial building energy standard,
ASHRAE Standard 90, was published in 1975. In 1982 it
was separated into non-residential (90.1) and residential (90.2) standards. Since its inception, the standard
has been upgraded nine times, resulting in significant
increases in building energy efficiency.4
The thick green line in Figure 1 shows the overall relative improvement in energy efficiency for each edition
of ASHRAE Standard 90/90.1 through 2013. Component
improvements based on changes in minimum efficiency requirements are also shown for prescriptive

Reid Hart, P.E., is a senior research engineer at Pacific Northwest National Laboratory in Richland, Wash. He is a consultant to ASHRAE SSPC 90.1.
26

ASHRAE JOURNAL

ashrae.org

JAN UARY 2015



ASHRAE Journal - January 2015

Table of Contents for the Digital Edition of ASHRAE Journal - January 2015

Contents
ASHRAE Journal - January 2015 - BB1
ASHRAE Journal - January 2015 - BB2
ASHRAE Journal - January 2015 - Cover1
ASHRAE Journal - January 2015 - Cover2
ASHRAE Journal - January 2015 - 1
ASHRAE Journal - January 2015 - 2
ASHRAE Journal - January 2015 - Contents
ASHRAE Journal - January 2015 - 4
ASHRAE Journal - January 2015 - 5
ASHRAE Journal - January 2015 - 6
ASHRAE Journal - January 2015 - 7
ASHRAE Journal - January 2015 - 8
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ASHRAE Journal - January 2015 - 80
ASHRAE Journal - January 2015 - Cover3
ASHRAE Journal - January 2015 - Cover4
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