ASHRAE Journal - August 2023 - 32

TECHNICAL FEATURE
FIGURE 3 General approach to energy credit requirement determination.
Exclude:
* Small Buildings
* Minor Alterations
* Manufacturing
* Site Only
* Core/Shell HVAC Type
* Parking Garage
* Semiheated; Unheated
* Initial Infill Areas
* Limited Unshaded Roof
* Cloudy Climate Areas
be cost effective for all building types and climate
zones using this approach. More detail
is included in Section 2.2 of " 90.1 Energy
Credits Analysis Documentation. " 2
Scope of Energy Credits and Requirement
Determination
Section 4 of Standard 90.1-2022 requires
that the energy credit requirements be
applied to all projects by including Section
11 of Standard 90.1-2022 in the main compliance
requirements. In some cases,
Section 11 limits the scope or provides exceptions
and adjustments to the required credits.
The scope and requirement adjustment
rules are reviewed in the " Energy Credits
Application Guide: ASHRAE Standard 90.12022, " 3
shown graphically in Figure 3, and
outlined here:
* Energy credits apply to new buildings
of measures. A more complete history of energy credits
is included in the " 90.1 Energy Credits Analysis
Documentation. " 2
Standard 90.1 Implementation
The SSPC for ASHRAE Standard 90.1 established a
working group that developed a consensus proposal
between June 2019 and June 2021. After the public
review process, the SSPC adopted energy credits into
Standard 90.1-2022. Energy credits were developed
from typical efficiency measures used in green building
programs, new construction utility incentive programs,
and Advanced Energy Design Guides.
Energy credits provide additional required prescriptive
savings that are more flexible than base prescriptive
requirements. The new credit requirement can be
met by selecting from a menu of 34 measures. Building
designers select from the available measures to meet a
savings target above the base prescriptive requirements.
Building-type-specific targets were developed with a
goal of 5% total building energy cost savings in each climate
zone.
Cost effectiveness for energy credit measures was
established by demonstrating that at least one package of
reasonable measures is cost-effective using the ASHRAE
Standard 90.1 scalar method.5 The energy credit
requirements included in 90.1-2022 were determined to
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ASHRAE JOURNAL ashrae.o rg
A U G UST 2023
and additions larger than 2,000 ft2 (186 m2).
* Alterations greater than 5,000 ft2 (465 m2) that have
major renovation or replacement of at least two of three
building systems (lighting, HVAC or envelope) also have
energy credit requirements.
* Core and shell construction with later tenant
build-out have requirements split between the initial
building and any later initial build-outs greater than
1,000 ft2 (93 m2). The split varies depending on whether
HVAC is a central system or completely in the later
build-out areas.
* Site-only projects and manufacturing areas are
excluded.
Types of Available Energy Credit Measures
There are two ways to look at the different types of
measures: 1) general category and 2) how credit points
are determined.
The general categories are:
* Energy efficiency measures. These measures
reduce the energy use of the building directly-either by
reducing the load on the building, through increased
system efficiency, or via energy saving controls.
* Renewable energy measures. These measures
offset metered energy use by using solar, wind or
other renewable technologies to generate energy at the
building site.
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ASHRAE Journal - August 2023

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