ASHRAE Journal - November 2023 - 42

TECHNICAL FEATURE
TABLE 2 Example Building Performance Factors (BPF) table from Standard 90.1's new Appendix I.
modelers on what tables to use and the appropriate
language changes.
Renewable Energy (Addenda ck, cp)
A new prescriptive requirement in Standard 90.1-2022
requires on-site renewable energy of " not less than
0.50 W/ft2 [5.4 W/m2] multiplied by the sum of the
gross conditioned floor area for all floors up to the
three largest floors, " with some exceptions. This new
prescriptive requirement prompted new rules for
both the ECBM and the PRM to allow buildings that
cannot meet that requirement or allow limited credit to
buildings that exceed it.
For ECBM, which already had a section on
renewables, the existing 5% limit on renewable energy
trade-offs has been changed to 5% in excess of the
new required amount. To support this requirement,
a new row was added to Table 12.5.1 that describes the
configuration of on-site renewable energy systems that
must be modeled in the budget design. For proposed
designs that include the on-site renewable energy
systems, the budget design must be modeled with
renewable energy systems of the same system type but
with capacity minimally compliant with the applicable
42
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prescriptive requirements in Section 10.5.1.1. For
proposed designs with no on-site renewable systems,
the modeling assumptions for a default unshaded
photovoltaic system to be modeled in the budget
design are provided.
For PRM, Table G3.1 also has a new section on on-site
renewable energy, but the baseline does not include
renewable energy in this case. Instead, in Section 4,
the Performance Cost Index Target (PCIt) equation
has been modified to account for the prescriptively
required renewable energy. Similar to the ECBM, the
equation caps the contribution of renewable energy
toward compliance at 5% over the prescriptively
required amount. The equation also requires modeling
the proposed design with a virtual, minimally codecompliant
on-site renewable energy system in place
of the specified system. Configuration of this virtual
system is determined following the same rules as
prescribed for the ECBM budget design.
ECBM Economizers and Budget HVAC System Cleanup
(Addendum u)
A significant change was made related to the type
of economizer used in Section 12.5.2, HVAC Systems.

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ASHRAE Journal - November 2023

Table of Contents for the Digital Edition of ASHRAE Journal - November 2023

Table of Contents
ASHRAE Journal - November 2023 - Intro
ASHRAE Journal - November 2023 - Cover1
ASHRAE Journal - November 2023 - Cover2
ASHRAE Journal - November 2023 - 1
ASHRAE Journal - November 2023 - Table of Contents
ASHRAE Journal - November 2023 - 3
ASHRAE Journal - November 2023 - 4
ASHRAE Journal - November 2023 - 5
ASHRAE Journal - November 2023 - 6
ASHRAE Journal - November 2023 - 7
ASHRAE Journal - November 2023 - 8
ASHRAE Journal - November 2023 - 9
ASHRAE Journal - November 2023 - 10
ASHRAE Journal - November 2023 - 11
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ASHRAE Journal - November 2023 - 15
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ASHRAE Journal - November 2023 - 20
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ASHRAE Journal - November 2023 - Cover3
ASHRAE Journal - November 2023 - Cover4
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